This appendix provides the Digital NOTAM format for the abbreviations and acronyms included in ICAO Doc 8400 Abbreviations and codes, categorized in accordance with the following defined rules:

Abbreviations that shall be spelled out and written in sentence case.
Abbreviations and acronym that shall be kept and spelled in upper case.
Abbreviations and acronyms that shall be kept and spelled in lower case.
Acronyms that shall be spelled out and with the first letter of all words in upper case (except for words that correspond to an acronym or abbreviation for which another rule allows to be kept and spelled in upper case, such as RWY, THR etc.).
Acronyms that shall be spelled out and then in lower case (except for the words that correspond to an acronym or abbreviation for which another rule allows to be kept and in upper case, such as RWY, THR, etc.).
Symbols for units of measurement

It is recognized that not all of the listed abbreviations and acronyms will be used in Digital NOTAM, e.g. "wilco", However, the spelling rules for lower and upper case for all Doc 8400 entries are provided for completeness sake, with the exception of some meteorological terms such as cloud types and certain meteorological service message terms.

Abbreviation/acronym	Digital NOTAM format	Meaning	Rule
A/A	a/a	air-to-air	1st Case - abbreviations and acronyms kept, but spelled in lower case
A/G	a/g	air-to-ground	1st Case - abbreviations and acronyms kept, but spelled in lower case
ACCID	aircraft accident	notification of an aircraft accident	1st Case - abbreviations and acronyms kept, but spelled in lower case
ACFT	acft	aircraft	1st Case - abbreviations and acronyms kept, but spelled in lower case
ACK	ack	acknowledge	1st Case - abbreviations and acronyms kept, but spelled in lower case
ALTN	altn	alternate (aerodrome), alternating (light colour)	1st Case - abbreviations and acronyms kept, but spelled in lower case
APCH	apch	approach	1st Case - abbreviations and acronyms kept, but spelled in lower case
APRX	aprx	approximate or approximately	1st Case - abbreviations and acronyms kept, but spelled in lower case
ARR	arr	arrive or arrival	1st Case - abbreviations and acronyms kept, but spelled in lower case
ASAP	asap	as soon as possible	1st Case - abbreviations and acronyms kept, but spelled in lower case
ASPH	asph	asphalt	1st Case - abbreviations and acronyms kept, but spelled in lower case
ATTN	attn	attention	1st Case - abbreviations and acronyms kept, but spelled in lower case
AUTH	auth	authorized, authorization	1st Case - abbreviations and acronyms kept, but spelled in lower case
AUTO	auto	automatic	1st Case - abbreviations and acronyms kept, but spelled in lower case
AVGAS	avgas	aviation gasoline	1st Case - abbreviations and acronyms kept, but spelled in lower case
AZM	azm	azimuth	1st Case - abbreviations and acronyms kept, but spelled in lower case
BCN	bcn	beacon (aeronautical ground light)	1st Case - abbreviations and acronyms kept, but spelled in lower case
BDRY	bdry	boundary	1st Case - abbreviations and acronyms kept, but spelled in lower case
CHEM	chem	chemical	1st Case - abbreviations and acronyms kept, but spelled in lower case
COND	cond	condition	1st Case - abbreviations and acronyms kept, but spelled in lower case
CONT	cont	continue(s) , continued	1st Case - abbreviations and acronyms kept, but spelled in lower case
COOR	coor	coordinate, coordination	1st Case - abbreviations and acronyms kept, but spelled in lower case
COORD	coord	coordinates	1st Case - abbreviations and acronyms kept, but spelled in lower case
DCKG	dckg	docking	1st Case - abbreviations and acronyms kept, but spelled in lower case
DEST	dest	destination	1st Case - abbreviations and acronyms kept, but spelled in lower case
DIST	dist	distance	1st Case - abbreviations and acronyms kept, but spelled in lower case
ELEV	elev	elevation	1st Case - abbreviations and acronyms kept, but spelled in lower case
EQPT	eqpt	equipment	1st Case - abbreviations and acronyms kept, but spelled in lower case
EXTD	extd	extend or extending	1st Case - abbreviations and acronyms kept, but spelled in lower case
FAC	fac	facilities	1st Case - abbreviations and acronyms kept, but spelled in lower case
FAX	fax	facsimile transmission	1st Case - abbreviations and acronyms kept, but spelled in lower case
FCST	fcst	forecast	1st Case - abbreviations and acronyms kept, but spelled in lower case
FM	fm	from	1st Case - abbreviations and acronyms kept, but spelled in lower case
FREQ	freq	frequency	1st Case - abbreviations and acronyms kept, but spelled in lower case
FRNG	frng	firing	1st Case - abbreviations and acronyms kept, but spelled in lower case
G/A	g/a	ground-to-air	1st Case - abbreviations and acronyms kept, but spelled in lower case
G/A/G	g/a/g	ground-to-air and air-to-ground	1st Case - abbreviations and acronyms kept, but spelled in lower case
HEL	hel	helicopter	1st Case - abbreviations and acronyms kept, but spelled in lower case
HGT	hgt	height or height above	1st Case - abbreviations and acronyms kept, but spelled in lower case
IDENT	ident	identification	1st Case - abbreviations and acronyms kept, but spelled in lower case
INCORP	incorp	incorporated	1st Case - abbreviations and acronyms kept, but spelled in lower case
INFO	info	information	1st Case - abbreviations and acronyms kept, but spelled in lower case
INOP	inop	inoperative	1st Case - abbreviations and acronyms kept, but spelled in lower case
INSTR	instr	instrument	1st Case - abbreviations and acronyms kept, but spelled in lower case
INTL	intl	international	1st Case - abbreviations and acronyms kept, but spelled in lower case
LAT	lat	latitude	1st Case - abbreviations and acronyms kept, but spelled in lower case
LDG	ldg	landing	1st Case - abbreviations and acronyms kept, but spelled in lower case
LONG	long	longitude	1st Case - abbreviations and acronyms kept, but spelled in lower case
MAINT	maint	maintenance	1st Case - abbreviations and acronyms kept, but spelled in lower case
MAX	max	maximum	1st Case - abbreviations and acronyms kept, but spelled in lower case
MNM	mnm	minimum	1st Case - abbreviations and acronyms kept, but spelled in lower case
MOV	mov	move , moving, movement	1st Case - abbreviations and acronyms kept, but spelled in lower case
MPS	mps	metres per second	1st Case - abbreviations and acronyms kept, but spelled in lower case
MSG	msg	message	1st Case - abbreviations and acronyms kept, but spelled in lower case
NAV	nav	navigation	1st Case - abbreviations and acronyms kept, but spelled in lower case
NAVAID	navaid	navigation aid	1st Case - abbreviations and acronyms kept, but spelled in lower case
NONSTD	nonstd	non-standard	1st Case - abbreviations and acronyms kept, but spelled in lower case
NOSIG	nosig	no significant change	1st Case - abbreviations and acronyms kept, but spelled in lower case
NR	nr	number	1st Case - abbreviations and acronyms kept, but spelled in lower case
NTL	ntl	national	1st Case - abbreviations and acronyms kept, but spelled in lower case
O/R	o/r	on request	1st Case - abbreviations and acronyms kept, but spelled in lower case
OBS	obs	observe, observed, observation	1st Case - abbreviations and acronyms kept, but spelled in lower case
OBST	obst	obstacle	1st Case - abbreviations and acronyms kept, but spelled in lower case
OPS	ops	operations	1st Case - abbreviations and acronyms kept, but spelled in lower case
PAX	pax	passenger(s)	1st Case - abbreviations and acronyms kept, but spelled in lower case
PERM	perm	permanent	1st Case - abbreviations and acronyms kept, but spelled in lower case
PROB	prob	probability	1st Case - abbreviations and acronyms kept, but spelled in lower case
PROC	proc	procedure	1st Case - abbreviations and acronyms kept, but spelled in lower case
PROP	prop	propeller	1st Case - abbreviations and acronyms kept, but spelled in lower case
PWR	pwr	power	1st Case - abbreviations and acronyms kept, but spelled in lower case
REF	ref	reference to, refer to	1st Case - abbreviations and acronyms kept, but spelled in lower case
REG	reg	registration	1st Case - abbreviations and acronyms kept, but spelled in lower case
REP	rep	report, reporting, reporting point	1st Case - abbreviations and acronyms kept, but spelled in lower case
REQ	req	request, requested	1st Case - abbreviations and acronyms kept, but spelled in lower case
RMK	rmk	remark	1st Case - abbreviations and acronyms kept, but spelled in lower case
RTE	rte	route	1st Case - abbreviations and acronyms kept, but spelled in lower case
SIG	sig	significant	1st Case - abbreviations and acronyms kept, but spelled in lower case
STN	stn	station	1st Case - abbreviations and acronyms kept, but spelled in lower case
STS	sts	status	1st Case - abbreviations and acronyms kept, but spelled in lower case
SUBJ	subj	subject to	1st Case - abbreviations and acronyms kept, but spelled in lower case
TEL	tel	telephone	1st Case - abbreviations and acronyms kept, but spelled in lower case
TEMPO	tempo	temporary, temporarily	1st Case - abbreviations and acronyms kept, but spelled in lower case
TFC	tfc	traffic	1st Case - abbreviations and acronyms kept, but spelled in lower case
TGL	tgl	touch-and-go landing	1st Case - abbreviations and acronyms kept, but spelled in lower case
TKOF	tkof	take-off	1st Case - abbreviations and acronyms kept, but spelled in lower case
TLOF	tlof	touchdown and lift-off area	1st Case - abbreviations and acronyms kept, but spelled in lower case
TURB	turb	turbulence	1st Case - abbreviations and acronyms kept, but spelled in lower case
UFN	ufn	until further notice	1st Case - abbreviations and acronyms kept, but spelled in lower case
VOL	vol	volume (followed by I, II...)	1st Case - abbreviations and acronyms kept, but spelled in lower case
VRB	vrb	variable	1st Case - abbreviations and acronyms kept, but spelled in lower case
WDI	wdi	wind direction indicator	1st Case - abbreviations and acronyms kept, but spelled in lower case
WEF	wef	with efffect from	1st Case - abbreviations and acronyms kept, but spelled in lower case
WIE	wie	with immediate effect	1st Case - abbreviations and acronyms kept, but spelled in lower case
WILCO	wilco	will comply	1st Case - abbreviations and acronyms kept, but spelled in lower case
WIP	wip	work in progress	1st Case - abbreviations and acronyms kept, but spelled in lower case
WRNG	wrng	warning	1st Case - abbreviations and acronyms kept, but spelled in lower case
WWW	www	worldwide web	1st Case - abbreviations and acronyms kept, but spelled in lower case
YR	yr	your	1st Case - abbreviations and acronyms kept, but spelled in lower case
ABN	ABN	Aerodrome Beacon	2nd Case - abbreviations and acronyms kept, spelled in upper case
ACARS	ACARS	Aircraft communication addressing and reporting system	2nd Case - abbreviations and acronyms kept, spelled in upper case
ACAS	ACAS	Airborne collision avoidance system	2nd Case - abbreviations and acronyms kept, spelled in upper case
ACC	ACC	Area Control Center	2nd Case - abbreviations and acronyms kept, spelled in upper case
ACL	ACL	Altimeter check location	2nd Case - abbreviations and acronyms kept, spelled in upper case
ACN	ACN	Aircraft classification number	2nd Case - abbreviations and acronyms kept, spelled in upper case
AD	AD	Aerodrome	2nd Case - abbreviations and acronyms kept, spelled in upper case
ADF	ADF	Automatic Direction-Finding Equipment	2nd Case - abbreviations and acronyms kept, spelled in upper case
ADIZ	ADIZ	Air Defence Identification Code	2nd Case - abbreviations and acronyms kept, spelled in upper case
ADS-B	ADS-B	Automatic Dependent Surveillance - Broadcast	2nd Case - abbreviations and acronyms kept, spelled in upper case
ADS-C	ADS-C	Automatic Dependent Surveillance - Contract	2nd Case - abbreviations and acronyms kept, spelled in upper case
ADSU	ADSU	Automatic Dependent Surveillance Unit	2nd Case - abbreviations and acronyms kept, spelled in upper case
AFIL	AFIL	Flight Plan Filed in the Air	2nd Case - abbreviations and acronyms kept, spelled in upper case
AFIS	AFIS	Aerodrome Flight Information Service	2nd Case - abbreviations and acronyms kept, spelled in upper case
AFTN	AFTN	Aeronautical Fixed Telecommunication Network	2nd Case - abbreviations and acronyms kept, spelled in upper case
AGA	AGA	Aerodromes, Air Routes and Ground Aids	2nd Case - abbreviations and acronyms kept, spelled in upper case
AGL	AGL	Above Ground Level	2nd Case - abbreviations and acronyms kept, spelled in upper case
AIC	AIC	Aeronautical Information Circular	2nd Case - abbreviations and acronyms kept, spelled in upper case
AIP	AIP	Aeronautical Information Publication	2nd Case - abbreviations and acronyms kept, spelled in upper case
AIRAC	AIRAC	Aeronautical Information Regulation and Control	2nd Case - abbreviations and acronyms kept, spelled in upper case
AIRMET	AIRMET	Information concerning en-route weather phenomena which may affect the safety of low-level aircraft operations	2nd Case - abbreviations and acronyms kept, spelled in upper case
AIS	AIS	Aeronautical Information Services	2nd Case - abbreviations and acronyms kept, spelled in upper case
ALERFA	ALERFA	Alert Phase	2nd Case - abbreviations and acronyms kept, spelled in upper case
ALT	ALT	Altitude	2nd Case - abbreviations and acronyms kept, spelled in upper case
AMDT	AMDT	Amendment (AIP Amendment)	2nd Case - abbreviations and acronyms kept, spelled in upper case
AMSL	AMSL	Above Mean Sea Level	2nd Case - abbreviations and acronyms kept, spelled in upper case
ANC	ANC	Aeronautical Chart - 1:500.000 (followed by name/title)	2nd Case - abbreviations and acronyms kept, spelled in upper case
ANCS	ANCS	Aeronautical Navigation Chart - Small Scale (followed by name/title and scale)	2nd Case - abbreviations and acronyms kept, spelled in upper case
AO	AO	Aircraft operator	2nd Case - abbreviations and acronyms kept, spelled in upper case
AOC	AOC	Aerodrome obstacle chart (followed by name/title)	2nd Case - abbreviations and acronyms kept, spelled in upper case
APAPI	APAPI	(to be pronounced "AY-PAPI")Abbreviated Precision Approach Path Indicator	2nd Case - abbreviations and acronyms kept, spelled in upper case
APDC	APDC	Aircraft parking/docking chart (followed by name/title)	2nd Case - abbreviations and acronyms kept, spelled in upper case
APP	APP	Approach Control Office OR Approach Control OR Approach Control Service	2nd Case - abbreviations and acronyms kept, spelled in upper case
APR	APR	April	2nd Case - abbreviations and acronyms kept, spelled in upper case
APU	APU	Auxiliary power unit	2nd Case - abbreviations and acronyms kept, spelled in upper case
APV	APV	Approach Procedure with Vertical guidance	2nd Case - abbreviations and acronyms kept, spelled in upper case
ARO	ARO	Air traffic services reporting office	2nd Case - abbreviations and acronyms kept, spelled in upper case
ARP	ARP	Aerodrome Reference Point	2nd Case - abbreviations and acronyms kept, spelled in upper case
ASDA	ASDA	Accelerate-Stop Distance Available	2nd Case - abbreviations and acronyms kept, spelled in upper case
ASHTAM	ASHTAM	ASHTAM	2nd Case - abbreviations and acronyms kept, spelled in upper case
ATA	ATA	Actual Time of Arrival	2nd Case - abbreviations and acronyms kept, spelled in upper case
ATC	ATC	Air Traffic Control (in general)	2nd Case - abbreviations and acronyms kept, spelled in upper case
ATD	ATD	Actual Time of Departure	2nd Case - abbreviations and acronyms kept, spelled in upper case
ATFM	ATFM	Air Traffic Flow Management	2nd Case - abbreviations and acronyms kept, spelled in upper case
ATIS	ATIS	Automatic Terminal Information Service	2nd Case - abbreviations and acronyms kept, spelled in upper case
ATM	ATM	Air Traffic Management	2nd Case - abbreviations and acronyms kept, spelled in upper case
ATN	ATN	Aeronautical Telecommunication Network	2nd Case - abbreviations and acronyms kept, spelled in upper case
ATS	ATS	Air Traffic Services	2nd Case - abbreviations and acronyms kept, spelled in upper case
AT-VASIS	AT-VASIS	AT Visual Approach Slope Indicator System	2nd Case - abbreviations and acronyms kept, spelled in upper case
ATZ	ATZ	Aerodrome Traffic Zone	2nd Case - abbreviations and acronyms kept, spelled in upper case
AUG	AUG	August	2nd Case - abbreviations and acronyms kept, spelled in upper case
AWOS	AWOS	Automated Weather Observation System	2nd Case - abbreviations and acronyms kept, spelled in upper case
AWY	AWY	Airway	2nd Case - abbreviations and acronyms kept, spelled in upper case
BARO-VNAV	BARO-VNAV	Barometric vertical navigation	2nd Case - abbreviations and acronyms kept, spelled in upper case
BRG	BRG	Bearing	2nd Case - abbreviations and acronyms kept, spelled in upper case
C	C	Centre (preceded by runway designation number to identify a parallel RWY)	2nd Case - abbreviations and acronyms kept, spelled in upper case
C	C	Degrees Celsius (Centigrade)	2nd Case - abbreviations and acronyms kept, spelled in upper case
CAA	CAA	Civil Aviation Authority or Civil Aviation Administration	2nd Case - abbreviations and acronyms kept, spelled in upper case
CAT	CAT	Category	2nd Case - abbreviations and acronyms kept, spelled in upper case
CAVOK	CAVOK	Visibility, cloud and present weather better than prescribed values or conditions	2nd Case - abbreviations and acronyms kept, spelled in upper case
CDR	CDR	Conditional route	2nd Case - abbreviations and acronyms kept, spelled in upper case
CH	CH	Channel	2nd Case - abbreviations and acronyms kept, spelled in upper case
CIDIN	CIDIN	Common ICAO Data Interchange Network	2nd Case - abbreviations and acronyms kept, spelled in upper case
CNS	CNS	Communications, Navigation and Surveillance	2nd Case - abbreviations and acronyms kept, spelled in upper case
COM	COM	Communications	2nd Case - abbreviations and acronyms kept, spelled in upper case
CPDLC	CPDLC	Controller-Pilot Data Link Communications	2nd Case - abbreviations and acronyms kept, spelled in upper case
CS	CS	Call sign	2nd Case - abbreviations and acronyms kept, spelled in upper case
CTA	CTA	Control Area	2nd Case - abbreviations and acronyms kept, spelled in upper case
CTR	CTR	Control Zone	2nd Case - abbreviations and acronyms kept, spelled in upper case
CWY	CWY	Clearway	2nd Case - abbreviations and acronyms kept, spelled in upper case
D....	D....	Danger area (followed by Identification)	2nd Case - abbreviations and acronyms kept, spelled in upper case
DA	DA	Decision Altitude	2nd Case - abbreviations and acronyms kept, spelled in upper case
D-ATIS	D-ATIS	Data Link Automatic Terminal Information Service	2nd Case - abbreviations and acronyms kept, spelled in upper case
DCT	DCT	Direct	2nd Case - abbreviations and acronyms kept, spelled in upper case
DEC	DEC	December	2nd Case - abbreviations and acronyms kept, spelled in upper case
DEG	DEG	Degrees	2nd Case - abbreviations and acronyms kept, spelled in upper case
DEP	DEP	Departure (message type designator)	2nd Case - abbreviations and acronyms kept, spelled in upper case
DETRESFA	DETRESFA	Distress Phase	2nd Case - abbreviations and acronyms kept, spelled in upper case
DF	DF	Direction Finding	2nd Case - abbreviations and acronyms kept, spelled in upper case
DH	DH	Decision Height	2nd Case - abbreviations and acronyms kept, spelled in upper case
DLA	DLA	Delay (message type designator)	2nd Case - abbreviations and acronyms kept, spelled in upper case
DME	DME	Distance Measuring Equipment	2nd Case - abbreviations and acronyms kept, spelled in upper case
D-VOLMET	D-VOLMET	Data Link VOLMET	2nd Case - abbreviations and acronyms kept, spelled in upper case
DVOR	DVOR	Doppler VOR	2nd Case - abbreviations and acronyms kept, spelled in upper case
E	E	Eastern Longitude	2nd Case - abbreviations and acronyms kept, spelled in upper case
EGNOS	EGNOS	European Geostationary Navigation Overlay Service	2nd Case - abbreviations and acronyms kept, spelled in upper case
EHF	EHF	Extremely High Frequency (30000 to 300000 MHz)	2nd Case - abbreviations and acronyms kept, spelled in upper case
ELBA	ELBA	Emergency Location Beacon - Aircraft	2nd Case - abbreviations and acronyms kept, spelled in upper case
ELT	ELT	Emergency Locator Transmitter	2nd Case - abbreviations and acronyms kept, spelled in upper case
EMERG	EMERG	Emergency	2nd Case - abbreviations and acronyms kept, spelled in upper case
ENR	ENR	En route	2nd Case - abbreviations and acronyms kept, spelled in upper case
ENRC	ENRC	Enroute chart (followed by name/title)	2nd Case - abbreviations and acronyms kept, spelled in upper case
EOBT	EOBT	Estimated Off-Block Time	2nd Case - abbreviations and acronyms kept, spelled in upper case
EST	EST	Estimate OR Estimated OR Estimation (message type designator)	2nd Case - abbreviations and acronyms kept, spelled in upper case
ETA	ETA	Estimated Time of Arrival OR Estimating Arrival	2nd Case - abbreviations and acronyms kept, spelled in upper case
ETD	ETD	Estimated Time of Departure OR Estimating Departure	2nd Case - abbreviations and acronyms kept, spelled in upper case
ETO	ETO	Estimated Time Over Significant Point	2nd Case - abbreviations and acronyms kept, spelled in upper case
FA	FA	Course from a fix to an altitude	2nd Case - abbreviations and acronyms kept, spelled in upper case
FAF	FAF	Final Approach Fix	2nd Case - abbreviations and acronyms kept, spelled in upper case
FAL	FAL	Facilitation of International Air Transport	2nd Case - abbreviations and acronyms kept, spelled in upper case
FAP	FAP	Final Approach Point	2nd Case - abbreviations and acronyms kept, spelled in upper case
FAS	FAS	Final Approach Segment	2nd Case - abbreviations and acronyms kept, spelled in upper case
FATO	FATO	Final Approach and Take-off Area	2nd Case - abbreviations and acronyms kept, spelled in upper case
FEB	FEB	February	2nd Case - abbreviations and acronyms kept, spelled in upper case
FIC	FIC	Flight Information Centre	2nd Case - abbreviations and acronyms kept, spelled in upper case
FIR	FIR	Flight Information Region	2nd Case - abbreviations and acronyms kept, spelled in upper case
FIS	FIS	Flight Information Service	2nd Case - abbreviations and acronyms kept, spelled in upper case
FL	FL	Flight Level	2nd Case - abbreviations and acronyms kept, spelled in upper case
FLG	FLG	Flashing	2nd Case - abbreviations and acronyms kept, spelled in upper case
FPL	FPL	Flight Plan	2nd Case - abbreviations and acronyms kept, spelled in upper case
FRI	FRI	Friday	2nd Case - abbreviations and acronyms kept, spelled in upper case
GA	GA	General Aviation	2nd Case - abbreviations and acronyms kept, spelled in upper case
GAGAN	GAGAN	GPS & Geostationary Earth Orbit Augmented Navigation	2nd Case - abbreviations and acronyms kept, spelled in upper case
GBAS	GBAS	Ground Based Augmentation System	2nd Case - abbreviations and acronyms kept, spelled in upper case
GEN	GEN	General	2nd Case - abbreviations and acronyms kept, spelled in upper case
GEO	GEO	Geographic OR True	2nd Case - abbreviations and acronyms kept, spelled in upper case
GLONAS	GLONAS	Global Orbiting Navigation Satellite System (to be pronounced "GLO-NAS")	2nd Case - abbreviations and acronyms kept, spelled in upper case
GND	GND	Ground	2nd Case - abbreviations and acronyms kept, spelled in upper case
GNSS	GNSS	Global Navigation Satellite System	2nd Case - abbreviations and acronyms kept, spelled in upper case
GOV	GOV	Government	2nd Case - abbreviations and acronyms kept, spelled in upper case
GP	GP	Glide Path	2nd Case - abbreviations and acronyms kept, spelled in upper case
GPS	GPS	Global Positioning System	2nd Case - abbreviations and acronyms kept, spelled in upper case
GS	GS	Ground Speed	2nd Case - abbreviations and acronyms kept, spelled in upper case
H24	H24	Continuous Day and Night Service	2nd Case - abbreviations and acronyms kept, spelled in upper case
HAPI	HAPI	Helicopter Approach Path Indicator	2nd Case - abbreviations and acronyms kept, spelled in upper case
HDF	HDF	High Frequency Direction-Finding Station	2nd Case - abbreviations and acronyms kept, spelled in upper case
HDG	HDG	Heading	2nd Case - abbreviations and acronyms kept, spelled in upper case
HF	HF	High Frequency [3000 to 30000 kHz]	2nd Case - abbreviations and acronyms kept, spelled in upper case
HJ	HJ	Sunrise to sunset	2nd Case - abbreviations and acronyms kept, spelled in upper case
HN	HN	Sunset to Sunrise	2nd Case - abbreviations and acronyms kept, spelled in upper case
HO	HO	Service available to meet operational requirements	2nd Case - abbreviations and acronyms kept, spelled in upper case
HOL	HOL	Holiday	2nd Case - abbreviations and acronyms kept, spelled in upper case
HOSP	HOSP	Hospital Aircraft	2nd Case - abbreviations and acronyms kept, spelled in upper case
HS	HS	Service Available During Hours of Scheduled Operations	2nd Case - abbreviations and acronyms kept, spelled in upper case
HUM	HUM	Humanitarian	2nd Case - abbreviations and acronyms kept, spelled in upper case
HVDF	HVDF	High and Very High Frequency Direction Finding Stations (At the Same Location)	2nd Case - abbreviations and acronyms kept, spelled in upper case
HX	HX	No Specific Working Hours	2nd Case - abbreviations and acronyms kept, spelled in upper case
IAC	IAC	Instrument Approach Chart (followed by name/title)	2nd Case - abbreviations and acronyms kept, spelled in upper case
IAF	IAF	Initial Approach Fix	2nd Case - abbreviations and acronyms kept, spelled in upper case
IAP	IAP	Instrument Approach Procedure	2nd Case - abbreviations and acronyms kept, spelled in upper case
IAS	IAS	Indicated Air Speed	2nd Case - abbreviations and acronyms kept, spelled in upper case
ICAO	ICAO	International Civil Aviation Organization	2nd Case - abbreviations and acronyms kept, spelled in upper case
ID	ID	Identifier OR Identify	2nd Case - abbreviations and acronyms kept, spelled in upper case
IF	IF	Intermediate Approach Fix	2nd Case - abbreviations and acronyms kept, spelled in upper case
IFR	IFR	Instrument Flight Rules	2nd Case - abbreviations and acronyms kept, spelled in upper case
ILS	ILS	Instrument Landing System	2nd Case - abbreviations and acronyms kept, spelled in upper case
IM	IM	Inner marker	2nd Case - abbreviations and acronyms kept, spelled in upper case
IMC	IMC	Instrument Meteorological Conditions	2nd Case - abbreviations and acronyms kept, spelled in upper case
INCERFA	INCERFA	Uncertainty Phase	2nd Case - abbreviations and acronyms kept, spelled in upper case
INS	INS	Inertial Navigation System	2nd Case - abbreviations and acronyms kept, spelled in upper case
IRS	IRS	Inertial reference system	2nd Case - abbreviations and acronyms kept, spelled in upper case
ISA	ISA	International Standard Atmosphere	2nd Case - abbreviations and acronyms kept, spelled in upper case
JAN	JAN	January	2nd Case - abbreviations and acronyms kept, spelled in upper case
JUL	JUL	July	2nd Case - abbreviations and acronyms kept, spelled in upper case
JUN	JUN	June	2nd Case - abbreviations and acronyms kept, spelled in upper case
KIAS	KIAS	Knots indicated airspeed	2nd Case - abbreviations and acronyms kept, spelled in upper case
L	L	Left (preceded by runway designation number to identify a parallel runway)	2nd Case - abbreviations and acronyms kept, spelled in upper case
L	L	Locator (See LM, LO)	2nd Case - abbreviations and acronyms kept, spelled in upper case
LDA	LDA	Landing Distance Available	2nd Case - abbreviations and acronyms kept, spelled in upper case
LDAH	LDAH	Landing Distance Available, Helicopter	2nd Case - abbreviations and acronyms kept, spelled in upper case
LDI	LDI	Landing Direction Indicator	2nd Case - abbreviations and acronyms kept, spelled in upper case
LF	LF	Low Frequency (30 to 300 kHz)	2nd Case - abbreviations and acronyms kept, spelled in upper case
LIH	LIH	Light Intensity High	2nd Case - abbreviations and acronyms kept, spelled in upper case
LIL	LIL	Light Intensity Low	2nd Case - abbreviations and acronyms kept, spelled in upper case
LIM	LIM	Light Intensity Medium	2nd Case - abbreviations and acronyms kept, spelled in upper case
LM	LM	Locator, Middle	2nd Case - abbreviations and acronyms kept, spelled in upper case
LNAV	LNAV	Lateral Navigation (to be pronounced "EL-NAV")	2nd Case - abbreviations and acronyms kept, spelled in upper case
LO	LO	Locator, Outer	2nd Case - abbreviations and acronyms kept, spelled in upper case
LOC	LOC	Localizer	2nd Case - abbreviations and acronyms kept, spelled in upper case
LORAN	LORAN	LORAN (Long Range Air Navigation System)	2nd Case - abbreviations and acronyms kept, spelled in upper case
LPV	LPV	Localizer Performance with Vertical Guidance	2nd Case - abbreviations and acronyms kept, spelled in upper case
LVP	LVP	Low Visibility Procedures	2nd Case - abbreviations and acronyms kept, spelled in upper case
M	M	Mach Number (Followed by figures)	2nd Case - abbreviations and acronyms kept, spelled in upper case
MAG	MAG	Magnetic	2nd Case - abbreviations and acronyms kept, spelled in upper case
MAP	MAP	Aeronautical maps and charts	2nd Case - abbreviations and acronyms kept, spelled in upper case
MAPT	MAPT	Missed Approach Point	2nd Case - abbreviations and acronyms kept, spelled in upper case
MAR	MAR	March	2nd Case - abbreviations and acronyms kept, spelled in upper case
MATZ	MATZ	Military Aerodrome Traffic Zone	2nd Case - abbreviations and acronyms kept, spelled in upper case
MAY	MAY	May	2nd Case - abbreviations and acronyms kept, spelled in upper case
MCTR	MCTR	Military Control Zone	2nd Case - abbreviations and acronyms kept, spelled in upper case
MDA	MDA	Minimum Descent Altitude	2nd Case - abbreviations and acronyms kept, spelled in upper case
MDH	MDH	Minimum Descent Height	2nd Case - abbreviations and acronyms kept, spelled in upper case
MEDEVAC	MEDEVAC	Medical Evacuation Flight	2nd Case - abbreviations and acronyms kept, spelled in upper case
MEHT	MEHT	Minimum Eye Height over Threshold (For VASIS and PAPI)	2nd Case - abbreviations and acronyms kept, spelled in upper case
MET	MET	Meteorological OR Meteorology	2nd Case - abbreviations and acronyms kept, spelled in upper case
METAR	METAR	Aerodrome routine meteorological report	2nd Case - abbreviations and acronyms kept, spelled in upper case
MF	MF	Medium Frequency (300 to 3000 kHz)	2nd Case - abbreviations and acronyms kept, spelled in upper case
MIL	MIL	Military	2nd Case - abbreviations and acronyms kept, spelled in upper case
MKR	MKR	Marker radio beacon	2nd Case - abbreviations and acronyms kept, spelled in upper case
MLS	MLS	Microwave Landing System	2nd Case - abbreviations and acronyms kept, spelled in upper case
MM	MM	Middle Marker	2nd Case - abbreviations and acronyms kept, spelled in upper case
MOA	MOA	Military Operating Area	2nd Case - abbreviations and acronyms kept, spelled in upper case
MOC	MOC	Minimum Obstacle Clearance (required)	2nd Case - abbreviations and acronyms kept, spelled in upper case
MON	MON	Monday	2nd Case - abbreviations and acronyms kept, spelled in upper case
MSL	MSL	Mean Sea Level	2nd Case - abbreviations and acronyms kept, spelled in upper case
MSSR	MSSR	Monopulse Secondary Surveillance Radar	2nd Case - abbreviations and acronyms kept, spelled in upper case
MWO	MWO	Meteorological Watch Office	2nd Case - abbreviations and acronyms kept, spelled in upper case
NAT	NAT	North Atlantic	2nd Case - abbreviations and acronyms kept, spelled in upper case
NDB	NDB	Non-Directional Radio Beacon	2nd Case - abbreviations and acronyms kept, spelled in upper case
NIL	NIL	None OR I Have nothing to send to you	2nd Case - abbreviations and acronyms kept, spelled in upper case
NOF	NOF	International NOTAM Office	2nd Case - abbreviations and acronyms kept, spelled in upper case
NOTAMC	NOTAMC	Cancelling NOTAM	2nd Case - abbreviations and acronyms kept, spelled in upper case
NOTAMN	NOTAMN	New NOTAM	2nd Case - abbreviations and acronyms kept, spelled in upper case
NOTAMR	NOTAMR	Replacing NOTAM	2nd Case - abbreviations and acronyms kept, spelled in upper case
NOV	NOV	November	2nd Case - abbreviations and acronyms kept, spelled in upper case
NPA	NPA	Non-precision approach	2nd Case - abbreviations and acronyms kept, spelled in upper case
OAC	OAC	Oceanic Area Control Centre	2nd Case - abbreviations and acronyms kept, spelled in upper case
OCA	OCA	Obstacle Clearance Altitude	2nd Case - abbreviations and acronyms kept, spelled in upper case
OCH	OCH	Obstacle Clearance Height	2nd Case - abbreviations and acronyms kept, spelled in upper case
OCT	OCT	October	2nd Case - abbreviations and acronyms kept, spelled in upper case
OLDI	OLDI	On-Line Data Interchange	2nd Case - abbreviations and acronyms kept, spelled in upper case
OM	OM	Outer Marker	2nd Case - abbreviations and acronyms kept, spelled in upper case
OPMET	OPMET	Operational Meteorological (information)	2nd Case - abbreviations and acronyms kept, spelled in upper case
P...	P...	Prohibited area (followed by identification)	2nd Case - abbreviations and acronyms kept, spelled in upper case
PANS	PANS	Procedures for Air Navigation Services	2nd Case - abbreviations and acronyms kept, spelled in upper case
PAPI	PAPI	Precision Approach Path Indicator	2nd Case - abbreviations and acronyms kept, spelled in upper case
PAR	PAR	Precision Approach Radar	2nd Case - abbreviations and acronyms kept, spelled in upper case
PATC	PATC	Precision Approach Terrain Chart (followed by name/title)	2nd Case - abbreviations and acronyms kept, spelled in upper case
PBN	PBN	Performance-based navigation	2nd Case - abbreviations and acronyms kept, spelled in upper case
PCN	PCN	Pavement Classification Number	2nd Case - abbreviations and acronyms kept, spelled in upper case
PIB	PIB	Pre-flight Information Bulletin	2nd Case - abbreviations and acronyms kept, spelled in upper case
PPR	PPR	Prior Permission Required	2nd Case - abbreviations and acronyms kept, spelled in upper case
PSR	PSR	Primary Surveillance Radar	2nd Case - abbreviations and acronyms kept, spelled in upper case
QDM	QDM	Magnetic Heading (zero wind)	2nd Case - abbreviations and acronyms kept, spelled in upper case
QDR	QDR	Magnetic Bearing	2nd Case - abbreviations and acronyms kept, spelled in upper case
QFE	QFE	Atmospheric pressure at aerodrome elevation (OR at runway threshold)	2nd Case - abbreviations and acronyms kept, spelled in upper case
QNH	QNH	Altimeter sub-scale setting to obtain elevation when on the ground	2nd Case - abbreviations and acronyms kept, spelled in upper case
QTE	QTE	True bearing	2nd Case - abbreviations and acronyms kept, spelled in upper case
R...	R...	Restricted area (followed by identification)	2nd Case - abbreviations and acronyms kept, spelled in upper case
R	R	Right (preceded by runway designation number to identify a parallel runway)	2nd Case - abbreviations and acronyms kept, spelled in upper case
R-NNN	R-nnn	Radial from VOR (followed by three figures)	2nd Case - abbreviations and acronyms kept, spelled in upper case
RAC	RAC	Rules of the Air and Air Traffic Services	2nd Case - abbreviations and acronyms kept, spelled in upper case
RAIM	RAIM	Receiver Autonomous Integrity Monitoring	2nd Case - abbreviations and acronyms kept, spelled in upper case
RCC	RCC	Rescue Co-ordination Centre	2nd Case - abbreviations and acronyms kept, spelled in upper case
RDH	RDH	Reference Datum Height	2nd Case - abbreviations and acronyms kept, spelled in upper case
RESA	RESA	Runway End Safety Area	2nd Case - abbreviations and acronyms kept, spelled in upper case
RNAV	RNAV	Area Navigation (to be pronounced "AR-NAV")	2nd Case - abbreviations and acronyms kept, spelled in upper case
RNP	RNP	Required Navigation Performance	2nd Case - abbreviations and acronyms kept, spelled in upper case
RPL	RPL	Repetitive flight plan	2nd Case - abbreviations and acronyms kept, spelled in upper case
RQP	RQP	Request flight plan (message type designator)	2nd Case - abbreviations and acronyms kept, spelled in upper case
RQS	RQS	Request supplementary flight plan (message type designator)	2nd Case - abbreviations and acronyms kept, spelled in upper case
RSR	RSR	En-Route Surveillance Radar	2nd Case - abbreviations and acronyms kept, spelled in upper case
RVR	RVR	Runway Visual Range	2nd Case - abbreviations and acronyms kept, spelled in upper case
RVSM	RVSM	Reduced Vertical Separation Minimum	2nd Case - abbreviations and acronyms kept, spelled in upper case
RWY	RWY	Runway	2nd Case - abbreviations and acronyms kept, spelled in upper case
SAR	SAR	Search and Rescue	2nd Case - abbreviations and acronyms kept, spelled in upper case
SARPS	SARPS	Standards and Recommended Practices ICAO	2nd Case - abbreviations and acronyms kept, spelled in upper case
SAT	SAT	Saturday	2nd Case - abbreviations and acronyms kept, spelled in upper case
SATCOM	SATCOM	Satellite Communication	2nd Case - abbreviations and acronyms kept, spelled in upper case
SBAS	SBAS	Satellite Based Augmentation System (to be pronounced "ESS-BAS")	2nd Case - abbreviations and acronyms kept, spelled in upper case
SELCAL	SELCAL	Selective calling system	2nd Case - abbreviations and acronyms kept, spelled in upper case
SEP	SEP	September	2nd Case - abbreviations and acronyms kept, spelled in upper case
SFC	SFC	Surface	2nd Case - abbreviations and acronyms kept, spelled in upper case
SHF	SHF	Super High Frequency (3000 to 30000 MHz)	2nd Case - abbreviations and acronyms kept, spelled in upper case
SI	SI	International system of units	2nd Case - abbreviations and acronyms kept, spelled in upper case
SID	SID	Standard Instrument Departure	2nd Case - abbreviations and acronyms kept, spelled in upper case
SIGMET	SIGMET	Information concerning en-route weather phenomena which may affect the safety of aircraft operations	2nd Case - abbreviations and acronyms kept, spelled in upper case
SNOWTAM	SNOWTAM	SNOWTAM	2nd Case - abbreviations and acronyms kept, spelled in upper case
SR	SR	Sunrise	2nd Case - abbreviations and acronyms kept, spelled in upper case
SRA	SRA	Surveillance Radar Approach	2nd Case - abbreviations and acronyms kept, spelled in upper case
SRE	SRE	Surveillance Radar Element of precision approach radar system	2nd Case - abbreviations and acronyms kept, spelled in upper case
SS	SS	Sunset	2nd Case - abbreviations and acronyms kept, spelled in upper case
SSR	SSR	Secondary Surveillance Radar	2nd Case - abbreviations and acronyms kept, spelled in upper case
STAR	STAR	Standard instrument arrival	2nd Case - abbreviations and acronyms kept, spelled in upper case
STD	STD	Standard	2nd Case - abbreviations and acronyms kept, spelled in upper case
SUN	SUN	Sunday	2nd Case - abbreviations and acronyms kept, spelled in upper case
SUP	SUP	Supplement (AIP Supplement)	2nd Case - abbreviations and acronyms kept, spelled in upper case
SUPPS	SUPPS	Regional supplementary procedures	2nd Case - abbreviations and acronyms kept, spelled in upper case
SWY	SWY	Stop way	2nd Case - abbreviations and acronyms kept, spelled in upper case
TA	TA	Transition Altitude	2nd Case - abbreviations and acronyms kept, spelled in upper case
TA/H	TA/H	Turn at an altitude/height	2nd Case - abbreviations and acronyms kept, spelled in upper case
TACAN	TACAN	UHF Tactical Air Navigation Aid	2nd Case - abbreviations and acronyms kept, spelled in upper case
TAF	TAF	Aerodrome forecast	2nd Case - abbreviations and acronyms kept, spelled in upper case
TAR	TAR	Terminal Area Surveillance Radar	2nd Case - abbreviations and acronyms kept, spelled in upper case
TAS	TAS	True Airspeed	2nd Case - abbreviations and acronyms kept, spelled in upper case
TCASRA	TCASRA	Traffic alert and collision avoidance system resolution advisory	2nd Case - abbreviations and acronyms kept, spelled in upper case
TDZ	TDZ	Touchdown Zone	2nd Case - abbreviations and acronyms kept, spelled in upper case
TF	TF	Track to fix	2nd Case - abbreviations and acronyms kept, spelled in upper case
THR	THR	Threshold	2nd Case - abbreviations and acronyms kept, spelled in upper case
THU	THU	Thursday	2nd Case - abbreviations and acronyms kept, spelled in upper case
TMA	TMA	Terminal Control Area	2nd Case - abbreviations and acronyms kept, spelled in upper case
TODA	TODA	Take-off Distance Available	2nd Case - abbreviations and acronyms kept, spelled in upper case
TODAH	TODAH	Take-off Distance Available, Helicopter	2nd Case - abbreviations and acronyms kept, spelled in upper case
TORA	TORA	Take-off Run Available	2nd Case - abbreviations and acronyms kept, spelled in upper case
TP	TP	Turning Point	2nd Case - abbreviations and acronyms kept, spelled in upper case
TRL	TRL	Transition Level	2nd Case - abbreviations and acronyms kept, spelled in upper case
TUE	TUE	Tuesday	2nd Case - abbreviations and acronyms kept, spelled in upper case
T-VASIS	T-VASIS	T Visual Approach Slope Indicator System	2nd Case - abbreviations and acronyms kept, spelled in upper case
TVOR	TVOR	Terminal VOR	2nd Case - abbreviations and acronyms kept, spelled in upper case
TWR	TWR	Aerodrome control tower OR aerodrome control	2nd Case - abbreviations and acronyms kept, spelled in upper case
TWY	TWY	Taxiway	2nd Case - abbreviations and acronyms kept, spelled in upper case
UAC	UAC	Upper Area Control Centre	2nd Case - abbreviations and acronyms kept, spelled in upper case
UDF	UDF	Ultra High Frequency Direction Finding Station	2nd Case - abbreviations and acronyms kept, spelled in upper case
UHF	UHF	Ultra High Frequency 300 to 3000 MHz	2nd Case - abbreviations and acronyms kept, spelled in upper case
UIR	UIR	Upper Flight Information Region	2nd Case - abbreviations and acronyms kept, spelled in upper case
UTA	UTA	Upper Control Area	2nd Case - abbreviations and acronyms kept, spelled in upper case
UTC	UTC	Coordinated Universal Time	2nd Case - abbreviations and acronyms kept, spelled in upper case
VA	VA	Volcanic Ash	2nd Case - abbreviations and acronyms kept, spelled in upper case
VAAC	VAAC	Volcanic Ash Advisory Centre	2nd Case - abbreviations and acronyms kept, spelled in upper case
VAC	VAC	Visual Approach Chart	2nd Case - abbreviations and acronyms kept, spelled in upper case
VAR	VAR	Magnetic Variation	2nd Case - abbreviations and acronyms kept, spelled in upper case
VASIS	VASIS	Visual Approach Slope Indicator System	2nd Case - abbreviations and acronyms kept, spelled in upper case
VDF	VDF	Very High Frequency Direction Finding Station	2nd Case - abbreviations and acronyms kept, spelled in upper case
VFR	VFR	Visual Flight Rules	2nd Case - abbreviations and acronyms kept, spelled in upper case
VHF	VHF	Very High Frequency [30 to 300 MHz]	2nd Case - abbreviations and acronyms kept, spelled in upper case
VIP	VIP	Very Important Person	2nd Case - abbreviations and acronyms kept, spelled in upper case
VLF	VLF	Very Low Frequency [3 to 30 KHz]	2nd Case - abbreviations and acronyms kept, spelled in upper case
VMC	VMC	Visual Meteorological Conditions	2nd Case - abbreviations and acronyms kept, spelled in upper case
VNAV	VNAV	Vertical Navigation (to be pronounced "VEE-NAV")	2nd Case - abbreviations and acronyms kept, spelled in upper case
VOLMET	VOLMET	Meteorological information for aircraft in flight	2nd Case - abbreviations and acronyms kept, spelled in upper case
VOR	VOR	Very High Frequency Omnidirectional Radio Range	2nd Case - abbreviations and acronyms kept, spelled in upper case
VORTAC	VORTAC	VOR and TACAN combination	2nd Case - abbreviations and acronyms kept, spelled in upper case
VTOL	VTOL	Vertical Take-Off and Landing	2nd Case - abbreviations and acronyms kept, spelled in upper case
WAAS	WAAS	Wide Area Augmentation System	2nd Case - abbreviations and acronyms kept, spelled in upper case
WAC	WAC	World Aeronautical Chart — ICAO 1:1 000 000 (followed by name/title)	2nd Case - abbreviations and acronyms kept, spelled in upper case
WED	WED	Wednesday	2nd Case - abbreviations and acronyms kept, spelled in upper case
WGS-84	WGS-84	World Geodetic System - 1984	2nd Case - abbreviations and acronyms kept, spelled in upper case
WPT	WPT	Way-point	2nd Case - abbreviations and acronyms kept, spelled in upper case
A	amber	amber	3rd Case - abbreviations spelled out in sentence case
ABM	abeam	abeam	3rd Case - abbreviations spelled out in sentence case
ABT	about	about	3rd Case - abbreviations spelled out in sentence case
ABV	…or above	…or above	3rd Case - abbreviations spelled out in sentence case
ACP	acceptance	acceptance	3rd Case - abbreviations spelled out in sentence case
ACPT	accept	accept	3rd Case - abbreviations spelled out in sentence case
ACT	active, activated, activity	active, activated, activity	3rd Case - abbreviations spelled out in sentence case
ADDN	additional, addition	additional, addition	3rd Case - abbreviations spelled out in sentence case
ADJ	adjacent	adjacent	3rd Case - abbreviations spelled out in sentence case
ADR	advisory route	advisory route	3rd Case - abbreviations spelled out in sentence case
ADS	the address	the address	3rd Case - abbreviations spelled out in sentence case
ADZ	advise	advise	3rd Case - abbreviations spelled out in sentence case
AFM	affirm, affirmative	affirm, affirmative	3rd Case - abbreviations spelled out in sentence case
AFT	after	after	3rd Case - abbreviations spelled out in sentence case
AGN	again	again	3rd Case - abbreviations spelled out in sentence case
ALR	alerting	alerting	3rd Case - abbreviations spelled out in sentence case
AMD	amend, amended	amend, amended	3rd Case - abbreviations spelled out in sentence case
ANS	answer	answer	3rd Case - abbreviations spelled out in sentence case
AP	airport	airport	3rd Case - abbreviations spelled out in sentence case
APN	apron	apron	3rd Case - abbreviations spelled out in sentence case
APV	approve, approved, approval	approve, approved, approval	3rd Case - abbreviations spelled out in sentence case
ARNG	arrange	arrange	3rd Case - abbreviations spelled out in sentence case
ARST	arresting	arresting	3rd Case - abbreviations spelled out in sentence case
ASC	ascend to, ascending to	ascend to, ascending to	3rd Case - abbreviations spelled out in sentence case
AUX	auxiliary	auxiliary	3rd Case - abbreviations spelled out in sentence case
AVBL	available	available	3rd Case - abbreviations spelled out in sentence case
AVG	average	average	3rd Case - abbreviations spelled out in sentence case
B	blue	blue	3rd Case - abbreviations spelled out in sentence case
BCST	broadcast	broadcast	3rd Case - abbreviations spelled out in sentence case
BECMG	becoming	becoming	3rd Case - abbreviations spelled out in sentence case
BFR	before	before	3rd Case - abbreviations spelled out in sentence case
BKN	broken	broken	3rd Case - abbreviations spelled out in sentence case
BLDG	building	building	3rd Case - abbreviations spelled out in sentence case
BLW	below	below	3rd Case - abbreviations spelled out in sentence case
BOMB	bombing	bombing	3rd Case - abbreviations spelled out in sentence case
BRF	short	short	3rd Case - abbreviations spelled out in sentence case
BRKG	breaking	breaking	3rd Case - abbreviations spelled out in sentence case
BTN	between	between	3rd Case - abbreviations spelled out in sentence case
CD	candela	candela	3rd Case - abbreviations spelled out in sentence case
CIV	civil	civil	3rd Case - abbreviations spelled out in sentence case
CFM	confirm	confirm	3rd Case - abbreviations spelled out in sentence case
CH#	channel	channel	3rd Case - abbreviations spelled out in sentence case
CK	check	check	3rd Case - abbreviations spelled out in sentence case
CL	centre line	centre line	3rd Case - abbreviations spelled out in sentence case
CLBR	calibration	calibration	3rd Case - abbreviations spelled out in sentence case
CLD	cloud	cloud	3rd Case - abbreviations spelled out in sentence case
CLG	calling	calling	3rd Case - abbreviations spelled out in sentence case
CLR	cleared, clear, clearance	cleared, clear, clearance	3rd Case - abbreviations spelled out in sentence case
CLSD	close, closed, closing	close, closed, closing	3rd Case - abbreviations spelled out in sentence case
CMB	climb, climbing to	climb, climbing to	3rd Case - abbreviations spelled out in sentence case
CMPL	completion, complete,completed	completion, complete,completed	3rd Case - abbreviations spelled out in sentence case
CNL	cancel, cancelled	cancel, cancelled	3rd Case - abbreviations spelled out in sentence case
CONC	concrete	concrete	3rd Case - abbreviations spelled out in sentence case
CONS	continuous	continuous	3rd Case - abbreviations spelled out in sentence case
CONST	construction, constructed	construction, constructed	3rd Case - abbreviations spelled out in sentence case
COV	cover	cover	3rd Case - abbreviations spelled out in sentence case
CRZ	cruise	cruise	3rd Case - abbreviations spelled out in sentence case
CTC	contact	contact	3rd Case - abbreviations spelled out in sentence case
CTL	control	control	3rd Case - abbreviations spelled out in sentence case
CTN	caution	caution	3rd Case - abbreviations spelled out in sentence case
CUST	customs	customs	3rd Case - abbreviations spelled out in sentence case
D	downward	downward	3rd Case - abbreviations spelled out in sentence case
DEP	departure, depart	departure, depart	3rd Case - abbreviations spelled out in sentence case
DEPO	deposition	deposition	3rd Case - abbreviations spelled out in sentence case
DES	descend, descending	descend, descending	3rd Case - abbreviations spelled out in sentence case
DEV	deviation, deviating	deviation, deviating	3rd Case - abbreviations spelled out in sentence case
DIF	diffuse	diffuse	3rd Case - abbreviations spelled out in sentence case
DIV	divert, diverting	divert, diverting	3rd Case - abbreviations spelled out in sentence case
DLA	delay, delayed	delay, delayed	3rd Case - abbreviations spelled out in sentence case
DLY	daily	daily	3rd Case - abbreviations spelled out in sentence case
DNG	danger, dangerous	danger, dangerous	3rd Case - abbreviations spelled out in sentence case
DOM	domestic	domestic	3rd Case - abbreviations spelled out in sentence case
DPT	depth	depth	3rd Case - abbreviations spelled out in sentence case
DRG	during	during	3rd Case - abbreviations spelled out in sentence case
DUR	duration	duration	3rd Case - abbreviations spelled out in sentence case
E	east	east	3rd Case - abbreviations spelled out in sentence case
EB	eastbound	eastbound	3rd Case - abbreviations spelled out in sentence case
EM	emission	emission	3rd Case - abbreviations spelled out in sentence case
EMBD	embedded	embedded	3rd Case - abbreviations spelled out in sentence case
ENG	engine	engine	3rd Case - abbreviations spelled out in sentence case
EV	every	every	3rd Case - abbreviations spelled out in sentence case
EXC	except	except	3rd Case - abbreviations spelled out in sentence case
EXER	exercises, exercising, exercise	exercises, exercising, exercise	3rd Case - abbreviations spelled out in sentence case
EXP	expect	expect	3rd Case - abbreviations spelled out in sentence case
F	fixed	fixed	3rd Case - abbreviations spelled out in sentence case
FLT	flight, flights	flight, flights	3rd Case - abbreviations spelled out in sentence case
FLUC	fluctuating, fluctuation, fluctuated	fluctuating, fluctuation, fluctuated	3rd Case - abbreviations spelled out in sentence case
FLW	follows, following	follows, following	3rd Case - abbreviations spelled out in sentence case
FRQ	frequent	frequent	3rd Case - abbreviations spelled out in sentence case
FST	first	first	3rd Case - abbreviations spelled out in sentence case
G	green	green	3rd Case - abbreviations spelled out in sentence case
GLD	glider	glider	3rd Case - abbreviations spelled out in sentence case
GRVL	gravel	gravel	3rd Case - abbreviations spelled out in sentence case
HLDG	holding	holding	3rd Case - abbreviations spelled out in sentence case
HLP	heliport	heliport	3rd Case - abbreviations spelled out in sentence case
HVY	heavy	heavy	3rd Case - abbreviations spelled out in sentence case
HYR	higher	higher	3rd Case - abbreviations spelled out in sentence case
IMG	immigration	immigration	3rd Case - abbreviations spelled out in sentence case
IMPR	improving, improve	improving, improve	3rd Case - abbreviations spelled out in sentence case
IMT	immediate, immediately	immediate, immediately	3rd Case - abbreviations spelled out in sentence case
INBD	inbound	inbound	3rd Case - abbreviations spelled out in sentence case
INSTL	installed	installed	3rd Case - abbreviations spelled out in sentence case
INT	intersection	intersection	3rd Case - abbreviations spelled out in sentence case
LCA	local, located, location, locally	local, located, location, locally	3rd Case - abbreviations spelled out in sentence case
LEN	length	length	3rd Case - abbreviations spelled out in sentence case
LNG	long	long	3rd Case - abbreviations spelled out in sentence case
LGT	light or lighting	light or lighting	3rd Case - abbreviations spelled out in sentence case
LGTD	lighted	lighted	3rd Case - abbreviations spelled out in sentence case
LTD	limited	limited	3rd Case - abbreviations spelled out in sentence case
LVE	leave, leaving	leave, leaving	3rd Case - abbreviations spelled out in sentence case
LVL	level	level	3rd Case - abbreviations spelled out in sentence case
LYR	layer, layered	layer, layered	3rd Case - abbreviations spelled out in sentence case
MBST	microburst	microburst	3rd Case - abbreviations spelled out in sentence case
MNT	monitor, monitoring, monitored	monitor, monitoring, monitored	3rd Case - abbreviations spelled out in sentence case
MNTN	maintain	maintain	3rd Case - abbreviations spelled out in sentence case
MS	minus	minus	3rd Case - abbreviations spelled out in sentence case
MT	mountain	mountain	3rd Case - abbreviations spelled out in sentence case
N	north	north	3rd Case - abbreviations spelled out in sentence case
NB	northbound	northbound	3rd Case - abbreviations spelled out in sentence case
NGT	night	night	3rd Case - abbreviations spelled out in sentence case
NML	normal	normal	3rd Case - abbreviations spelled out in sentence case
NXT	next	next	3rd Case - abbreviations spelled out in sentence case
OBSC	obscure, obscured, obscuring	obscure, obscured, obscuring	3rd Case - abbreviations spelled out in sentence case
OCC	occulting	occulting	3rd Case - abbreviations spelled out in sentence case
OCNL	occasional, occasionally	occasional, occasionally	3rd Case - abbreviations spelled out in sentence case
OHD	overhead	overhead	3rd Case - abbreviations spelled out in sentence case
OPN	open	open	3rd Case - abbreviations spelled out in sentence case
OPR	operator, operate, operative	operator, operate, operative	3rd Case - abbreviations spelled out in sentence case
ORD	order	order	3rd Case - abbreviations spelled out in sentence case
OUBD	outbound	outbound	3rd Case - abbreviations spelled out in sentence case
OVC	overcast	overcast	3rd Case - abbreviations spelled out in sentence case
PARL	parallel	parallel	3rd Case - abbreviations spelled out in sentence case
PCD	proceed, proceeding	proceed, proceeding	3rd Case - abbreviations spelled out in sentence case
PCT	per cent	per cent	3rd Case - abbreviations spelled out in sentence case
PER	performance	performance	3rd Case - abbreviations spelled out in sentence case
POSS	possible	possible	3rd Case - abbreviations spelled out in sentence case
PRI	primary	primary	3rd Case - abbreviations spelled out in sentence case
PRKG	parking	parking	3rd Case - abbreviations spelled out in sentence case
PROV	provisional	provisional	3rd Case - abbreviations spelled out in sentence case
PS	plus	plus	3rd Case - abbreviations spelled out in sentence case
PSG	passing	passing	3rd Case - abbreviations spelled out in sentence case
PSN	position	position	3rd Case - abbreviations spelled out in sentence case
QUAD	quadrant	quadrant	3rd Case - abbreviations spelled out in sentence case
R	red	red	3rd Case - abbreviations spelled out in sentence case
RAG	ragged	ragged	3rd Case - abbreviations spelled out in sentence case
RCH	reach, reaching	reach, reaching	3rd Case - abbreviations spelled out in sentence case
RDO	radio	radio	3rd Case - abbreviations spelled out in sentence case
REC	receive, receiver	receive, receiver	3rd Case - abbreviations spelled out in sentence case
RDL	radial	radial	3rd Case - abbreviations spelled out in sentence case
RG	range	range	3rd Case - abbreviations spelled out in sentence case
RPLC	replace, replaced	replace, replaced	3rd Case - abbreviations spelled out in sentence case
RQMNTS	requirements	requirements	3rd Case - abbreviations spelled out in sentence case
RTF	radiotelephone	radiotelephone	3rd Case - abbreviations spelled out in sentence case
RTG	radiotelegraph	radiotelegraph	3rd Case - abbreviations spelled out in sentence case
RTN	return, returned, returning	return, returned, returning	3rd Case - abbreviations spelled out in sentence case
S	south	south	3rd Case - abbreviations spelled out in sentence case
SAN	sanitary	sanitary	3rd Case - abbreviations spelled out in sentence case
SB	southbound	southbound	3rd Case - abbreviations spelled out in sentence case
SECN	section	section	3rd Case - abbreviations spelled out in sentence case
SECT	sector	sector	3rd Case - abbreviations spelled out in sentence case
SER	service	service	3rd Case - abbreviations spelled out in sentence case
SGL	signal	signal	3rd Case - abbreviations spelled out in sentence case
SIMUL	simultaneous, simultaneously	simultaneous, simultaneously	3rd Case - abbreviations spelled out in sentence case
SLW	slow	slow	3rd Case - abbreviations spelled out in sentence case
SRY	secondary	secondary	3rd Case - abbreviations spelled out in sentence case
SS	sandstorm	sandstorm	3rd Case - abbreviations spelled out in sentence case
SVCBL	serviceable	serviceable	3rd Case - abbreviations spelled out in sentence case
T	temperature	temperature	3rd Case - abbreviations spelled out in sentence case
T	true	true	3rd Case - abbreviations spelled out in sentence case
TAIL	tail wind	tail wind	3rd Case - abbreviations spelled out in sentence case
TAX	taxiing, taxi	taxiing, taxi	3rd Case - abbreviations spelled out in sentence case
THRU	through	through	3rd Case - abbreviations spelled out in sentence case
TIL	until	until	3rd Case - abbreviations spelled out in sentence case
TOX	toxic	toxic	3rd Case - abbreviations spelled out in sentence case
TR	track	track	3rd Case - abbreviations spelled out in sentence case
TROP	tropopause	tropopause	3rd Case - abbreviations spelled out in sentence case
TT	teletypewriter	teletypewriter	3rd Case - abbreviations spelled out in sentence case
U/S	unserviceable	unserviceable	3rd Case - abbreviations spelled out in sentence case
UNA	unable	unable	3rd Case - abbreviations spelled out in sentence case
UNL	unlimited	unlimited	3rd Case - abbreviations spelled out in sentence case
UNREL	unreliable	unreliable	3rd Case - abbreviations spelled out in sentence case
VCY	vicinity	vicinity	3rd Case - abbreviations spelled out in sentence case
VER	vertical	vertical	3rd Case - abbreviations spelled out in sentence case
VIS	visibility	visibility	3rd Case - abbreviations spelled out in sentence case
W	west	west	3rd Case - abbreviations spelled out in sentence case
W	white	white	3rd Case - abbreviations spelled out in sentence case
WB	westbound	westbound	3rd Case - abbreviations spelled out in sentence case
WI	within	within	3rd Case - abbreviations spelled out in sentence case
WID	width	width	3rd Case - abbreviations spelled out in sentence case
WKN	weaken, weakening	weaken, weakening	3rd Case - abbreviations spelled out in sentence case
WO	without	without	3rd Case - abbreviations spelled out in sentence case
WS	windshear	windshear	3rd Case - abbreviations spelled out in sentence case
WSPD	windspeed	windspeed	3rd Case - abbreviations spelled out in sentence case
WT	weight	weight	3rd Case - abbreviations spelled out in sentence case
WTSPT	waterspout	waterspout	3rd Case - abbreviations spelled out in sentence case
WX	weather radar	weather radar	3rd Case - abbreviations spelled out in sentence case
X	cross	cross	3rd Case - abbreviations spelled out in sentence case
XBAR	crossbar	crossbar	3rd Case - abbreviations spelled out in sentence case
XNG	crossing	crossing	3rd Case - abbreviations spelled out in sentence case
XS	atmospheric	atmospheric	3rd Case - abbreviations spelled out in sentence case
Y	yellow	yellow	3rd Case - abbreviations spelled out in sentence case
AAD	assigned altitude deviation	assigned altitude deviation	4th Case - acronyms spelled out in lower case
AAR	air to air refuelling	air to air refuelling	4th Case - acronyms spelled out in lower case
ABI	advance boundary information	advance boundary information	4th Case - acronyms spelled out in lower case
ADO	aerodrome office	aerodrome office	4th Case - acronyms spelled out in lower case
ADVS	advisory service	advisory service	4th Case - acronyms spelled out in lower case
AES	aircraft earth station	aircraft earth station	4th Case - acronyms spelled out in lower case
AIDC	air traffic services interfacility data communications	air traffic services interfacility data communications	4th Case - acronyms spelled out in lower case
AIREP	air-report	air-report	4th Case - acronyms spelled out in lower case
ALA	alighting area	alighting area	4th Case - acronyms spelled out in lower case
ALRS	alerting service	alerting service	4th Case - acronyms spelled out in lower case
AMS	aeronautical mobile service	aeronautical mobile service	4th Case - acronyms spelled out in lower case
AMSS	aeronautical mobile satellite service	aeronautical mobile satellite service	4th Case - acronyms spelled out in lower case
APSG	after passing	after passing	4th Case - acronyms spelled out in lower case
ARP	air-report	air-report	4th Case - acronyms spelled out in lower case
ARQ	automatic error correction	automatic error correction	4th Case - acronyms spelled out in lower case
ARS	special air-report	special air-report	4th Case - acronyms spelled out in lower case
ASE	altimetry system error	altimetry system error	4th Case - acronyms spelled out in lower case
ATP	at… time or place	at… time or place	4th Case - acronyms spelled out in lower case
AUW	all up weight	all up weight	4th Case - acronyms spelled out in lower case
AWTA	advise at what time able	advise at what time able	4th Case - acronyms spelled out in lower case
BA	braking action (not each word in upper)	braking action (not each word in upper)	4th Case - acronyms spelled out in lower case
BASE	cloud base	cloud base	4th Case - acronyms spelled out in lower case
BLO	below clouds	below clouds	4th Case - acronyms spelled out in lower case
BS	commercial broadcasting station	commercial broadcasting station	4th Case - acronyms spelled out in lower case
BTL	between layers	between layers	4th Case - acronyms spelled out in lower case
CA	course to an altitude	course to an altitude	4th Case - acronyms spelled out in lower case
CAT	clear air turbulence	clear air turbulence	4th Case - acronyms spelled out in lower case
CF	change frequency to	change frequency to	4th Case - acronyms spelled out in lower case
CF	course to a fix	course to a fix	4th Case - acronyms spelled out in lower case
CGL	circling guidance lights	circling guidance lights	4th Case - acronyms spelled out in lower case
CLA	clear type of ice formation	clear type of ice formation	4th Case - acronyms spelled out in lower case
CLIMB-OUT	climb-out area	climb-out area	4th Case - acronyms spelled out in lower case
CLRD	RWY cleared	RWY cleared	4th Case - acronyms spelled out in lower case
COP	change-over point	change-over point	4th Case - acronyms spelled out in lower case
COT	at the coast	at the coast	4th Case - acronyms spelled out in lower case
CPL	current flight plan	current flight plan	4th Case - acronyms spelled out in lower case
CRM	collision risk model	collision risk model	4th Case - acronyms spelled out in lower case
CTAM	climb and maintain	climb and maintain	4th Case - acronyms spelled out in lower case
CVR	cockpit voice recorder	cockpit voice recorder	4th Case - acronyms spelled out in lower case
CW	continuous wave	continuous wave	4th Case - acronyms spelled out in lower case
DCD	double channel duplex	double channel duplex	4th Case - acronyms spelled out in lower case
DCP	datum crossing point	datum crossing point	4th Case - acronyms spelled out in lower case
DCS	double channel simplex	double channel simplex	4th Case - acronyms spelled out in lower case
DER	departure end of RWY	departure end of RWY	4th Case - acronyms spelled out in lower case
DFDR	digital flight data recorder	digital flight data recorder	4th Case - acronyms spelled out in lower case
DFTI	distance from touchdown indication	distance from touchdown indication	4th Case - acronyms spelled out in lower case
DLIC	data link initiation capability	data link initiation capability	4th Case - acronyms spelled out in lower case
DOF	date of flight	date of flight	4th Case - acronyms spelled out in lower case
DP	dew point temperature	dew point temperature	4th Case - acronyms spelled out in lower case
DR	dead reckoning	dead reckoning	4th Case - acronyms spelled out in lower case
DSB	double sideband	double sideband	4th Case - acronyms spelled out in lower case
DTAM	descend to and maintain	descend to and maintain	4th Case - acronyms spelled out in lower case
DTG	date-time-group	date-time-group	4th Case - acronyms spelled out in lower case
DTHR	displaced THR	displaced THR	4th Case - acronyms spelled out in lower case
DTRT	deteriorate, deteriorating	deteriorate, deteriorating	4th Case - acronyms spelled out in lower case
DTW	dual tandem wheels	dual tandem wheels	4th Case - acronyms spelled out in lower case
DUC	dense upper cloud	dense upper cloud	4th Case - acronyms spelled out in lower case
DUPE#	duplicated message	duplicated message	4th Case - acronyms spelled out in lower case
DW	dual wheels	dual wheels	4th Case - acronyms spelled out in lower case
EAT	expected approach time	expected approach time	4th Case - acronyms spelled out in lower case
EDA	elevation differential area	elevation differential area	4th Case - acronyms spelled out in lower case
EET	estimated elapsed time	estimated elapsed time	4th Case - acronyms spelled out in lower case
EFC	expected further clearance	expected further clearance	4th Case - acronyms spelled out in lower case
EFIS	electronic flight instrument systems	electronic flight instrument systems	4th Case - acronyms spelled out in lower case
ELR	extra long range	extra long range	4th Case - acronyms spelled out in lower case
END	stop-end	stop-end	4th Case - acronyms spelled out in lower case
ENE	east-north-east	east-north-east	4th Case - acronyms spelled out in lower case
ESE	east-south-east	east-south-east	4th Case - acronyms spelled out in lower case
EVS	enhanced vision system	enhanced vision system	4th Case - acronyms spelled out in lower case
FCT	friction coefficient	friction coefficient	4th Case - acronyms spelled out in lower case
FDPS	flight data processing system	flight data processing system	4th Case - acronyms spelled out in lower case
FISA	Use 'Automated FIS' instead.	Use 'Automated FIS' instead.	4th Case - acronyms spelled out in lower case
FLTCK	flight check	flight check	4th Case - acronyms spelled out in lower case
FLY	fly, flying	fly, flying	4th Case - acronyms spelled out in lower case
FM	from	from	4th Case - acronyms spelled out in lower case
FNA	final approach	final approach	4th Case - acronyms spelled out in lower case
FPAP	flight path alignment point	flight path alignment point	4th Case - acronyms spelled out in lower case
FPM	feet per minute	feet per minute	4th Case - acronyms spelled out in lower case
FPR	fligh plan route	fligh plan route	4th Case - acronyms spelled out in lower case
FR	fuel remaining	fuel remaining	4th Case - acronyms spelled out in lower case
FSL	full stop landing	full stop landing	4th Case - acronyms spelled out in lower case
FSS	flight service station	flight service station	4th Case - acronyms spelled out in lower case
FTE	flight technical error	flight technical error	4th Case - acronyms spelled out in lower case
FTT	flight technical tolerance	flight technical tolerance	4th Case - acronyms spelled out in lower case
GA	go ahead, resume sending	go ahead, resume sending	4th Case - acronyms spelled out in lower case
GAIN	airspeed or headwind gain	airspeed or headwind gain	4th Case - acronyms spelled out in lower case
GARP	GBAS azimuth reference point	GBAS azimuth reference point	4th Case - acronyms spelled out in lower case
GLS	GLS landing system	GLS landing system	4th Case - acronyms spelled out in lower case
GNDCK	ground check	ground check	4th Case - acronyms spelled out in lower case
GPA	glide path angle	glide path angle	4th Case - acronyms spelled out in lower case
GPIP	glide path intercept point	glide path intercept point	4th Case - acronyms spelled out in lower case
GRAS	ground based regional augmentation system	ground based regional augmentation system	4th Case - acronyms spelled out in lower case
GUND	geoid undulation	geoid undulation	4th Case - acronyms spelled out in lower case
HA	holding/racetrack to an altitude	holding/racetrack to an altitude	4th Case - acronyms spelled out in lower case
HBN	hazard beacon	hazard beacon	4th Case - acronyms spelled out in lower case
HF	holding/racetrack to a fix	holding/racetrack to a fix	4th Case - acronyms spelled out in lower case
HLS	heliport landing site	heliport landing site	4th Case - acronyms spelled out in lower case
HM	holding/racetrack to a manual termination	holding/racetrack to a manual termination	4th Case - acronyms spelled out in lower case
HUD	head-up display	head-up display	4th Case - acronyms spelled out in lower case
IAO	in and out of clouds	in and out of clouds	4th Case - acronyms spelled out in lower case
IAR	intersection of air routes	intersection of air routes	4th Case - acronyms spelled out in lower case
IBN	identification beacon	identification beacon	4th Case - acronyms spelled out in lower case
IFF	identification friend/foe	identification friend/foe	4th Case - acronyms spelled out in lower case
IGA	international general aviation	international general aviation	4th Case - acronyms spelled out in lower case
INA	intital approach	intital approach	4th Case - acronyms spelled out in lower case
INC	in cloud	in cloud	4th Case - acronyms spelled out in lower case
INP	if not possible	if not possible	4th Case - acronyms spelled out in lower case
INPR	in progress	in progress	4th Case - acronyms spelled out in lower case
ISB	independent sideband	independent sideband	4th Case - acronyms spelled out in lower case
ISOL	isolated	isolated	4th Case - acronyms spelled out in lower case
JTST	jetstream	jetstream	4th Case - acronyms spelled out in lower case
LAN	inland	inland	4th Case - acronyms spelled out in lower case
LMT	local mean time	local mean time	4th Case - acronyms spelled out in lower case
LOSS	airspeed or headwind loss	airspeed or headwind loss	4th Case - acronyms spelled out in lower case
LRG	long range	long range	4th Case - acronyms spelled out in lower case
LTP	landing thr point	landing thr point	4th Case - acronyms spelled out in lower case
MAHF	missed approach holding fix	missed approach holding fix	4th Case - acronyms spelled out in lower case
MAR	at sea	at sea	4th Case - acronyms spelled out in lower case
MATF	missed approach turning fix	missed approach turning fix	4th Case - acronyms spelled out in lower case
MCW	modulated continuous wave	modulated continuous wave	4th Case - acronyms spelled out in lower case
MDF	medium frequency direction finding station	medium frequency direction finding station	4th Case - acronyms spelled out in lower case
MHDF	medium and high frequency direction finding stations	medium and high frequency direction finding stations	4th Case - acronyms spelled out in lower case
MHVDF	medium, high and very high frequency direction finding stations	medium, high and very high frequency direction finding stations	4th Case - acronyms spelled out in lower case
MID	mid-point	mid-point	4th Case - acronyms spelled out in lower case
MON	above mountains	above mountains	4th Case - acronyms spelled out in lower case
MOPS	minimum operational performance standards	minimum operational performance standards	4th Case - acronyms spelled out in lower case
MRG	medim range	medim range	4th Case - acronyms spelled out in lower case
MSAW	minimum safety altitude warning	minimum safety altitude warning	4th Case - acronyms spelled out in lower case
MTOM	maximum take-off mass	maximum take-off mass	4th Case - acronyms spelled out in lower case
MTU	metric units	metric units	4th Case - acronyms spelled out in lower case
MTW	moutain waves	moutain waves	4th Case - acronyms spelled out in lower case
MVDF	medium and very high hrequency direction finding stations	medium and very high hrequency direction finding stations	4th Case - acronyms spelled out in lower case
N	no distinct tendency	no distinct tendency	4th Case - acronyms spelled out in lower case
NADP	noise abatement departure procedure	noise abatement departure procedure	4th Case - acronyms spelled out in lower case
NASC	national AIS system centre	national AIS system centre	4th Case - acronyms spelled out in lower case
NBFR	not before	not before	4th Case - acronyms spelled out in lower case
NC	no change	no change	4th Case - acronyms spelled out in lower case
NE	north-east	north-east	4th Case - acronyms spelled out in lower case
NEB	north-eastbound	north-eastbound	4th Case - acronyms spelled out in lower case
NEG	negative	negative	4th Case - acronyms spelled out in lower case
NN	no name, unnamed	no name, unnamed	4th Case - acronyms spelled out in lower case
NNE	north-north-east	north-north-east	4th Case - acronyms spelled out in lower case
NNW	north-north-west	north-north-west	4th Case - acronyms spelled out in lower case
NRH	no reply heard	no reply heard	4th Case - acronyms spelled out in lower case
NSE	navigation system error	navigation system error	4th Case - acronyms spelled out in lower case
NSW	nil significant weather	nil significant weather	4th Case - acronyms spelled out in lower case
NW	north-west	north-west	4th Case - acronyms spelled out in lower case
NWB	north-westbound	north-westbound	4th Case - acronyms spelled out in lower case
OPC	the control indicated is operational control	the control indicated is operational control	4th Case - acronyms spelled out in lower case
OSV	ocean station vessel	ocean station vessel	4th Case - acronyms spelled out in lower case
OTP	on top	on top	4th Case - acronyms spelled out in lower case
PA	precision approach	precision approach	4th Case - acronyms spelled out in lower case
PCL	pilot-controlled lighting	pilot-controlled lighting	4th Case - acronyms spelled out in lower case
PDC	pre-departure clearance	pre-departure clearance	4th Case - acronyms spelled out in lower case
PDG	procedure design gradient	procedure design gradient	4th Case - acronyms spelled out in lower case
PJE	parachute jumping exercise	parachute jumping exercise	4th Case - acronyms spelled out in lower case
PLA	practice low approach	practice low approach	4th Case - acronyms spelled out in lower case
PLVL	present level	present level	4th Case - acronyms spelled out in lower case
PN	prior notice required	prior notice required	4th Case - acronyms spelled out in lower case
PNR	point of no return	point of no return	4th Case - acronyms spelled out in lower case
POB	persons on board	persons on board	4th Case - acronyms spelled out in lower case
PPI	plan position indicator	plan position indicator	4th Case - acronyms spelled out in lower case
PPSN	present position	present position	4th Case - acronyms spelled out in lower case
PRP	point-in-space reference point	point-in-space reference point	4th Case - acronyms spelled out in lower case
PSP	pierced steel plank	pierced steel plank	4th Case - acronyms spelled out in lower case
PSYS	pressure system(s)	pressure system(s)	4th Case - acronyms spelled out in lower case
PTN	procedure turn	procedure turn	4th Case - acronyms spelled out in lower case
R	rate of turn	rate of turn	4th Case - acronyms spelled out in lower case
RA	resolution advisory	resolution advisory	4th Case - acronyms spelled out in lower case
RAG	RWY arresting gear	RWY arresting gear	4th Case - acronyms spelled out in lower case
RAI	RWY alignment indicator	RWY alignment indicator	4th Case - acronyms spelled out in lower case
RB	rescue boat	rescue boat	4th Case - acronyms spelled out in lower case
RCL	RWY centre line	RWY centre line	4th Case - acronyms spelled out in lower case
RCLL	RWY centre line light(s)	RWY centre line light(s)	4th Case - acronyms spelled out in lower case
RCLR	recleared	recleared	4th Case - acronyms spelled out in lower case
RCP	required communication performance	required communication performance	4th Case - acronyms spelled out in lower case
REDL	RWY edge light(s)	RWY edge light(s)	4th Case - acronyms spelled out in lower case
RENL	RWY end light(s)	RWY end light(s)	4th Case - acronyms spelled out in lower case
RHC	right-hand circuit	right-hand circuit	4th Case - acronyms spelled out in lower case
RIF	reclearance in flight	reclearance in flight	4th Case - acronyms spelled out in lower case
RL	report leaving	report leaving	4th Case - acronyms spelled out in lower case
RLA	relay to	relay to	4th Case - acronyms spelled out in lower case
RLCE	request level change en-route	request level change en-route	4th Case - acronyms spelled out in lower case
RLLS	RWY lead-in lighting system	RWY lead-in lighting system	4th Case - acronyms spelled out in lower case
RLNA	requested level not available	requested level not available	4th Case - acronyms spelled out in lower case
RNG	radio range	radio range	4th Case - acronyms spelled out in lower case
ROC	rate of climb	rate of climb	4th Case - acronyms spelled out in lower case
ROD	rate of descent	rate of descent	4th Case - acronyms spelled out in lower case
RON	receiving only	receiving only	4th Case - acronyms spelled out in lower case
RPDS	reference path data selector	reference path data selector	4th Case - acronyms spelled out in lower case
RPI	radar position Indicator	radar position Indicator	4th Case - acronyms spelled out in lower case
RR	report reaching	report reaching	4th Case - acronyms spelled out in lower case
RSC	rescue sub-centre	rescue sub-centre	4th Case - acronyms spelled out in lower case
RSCD	runway surface condition	runway surface condition	4th Case - acronyms spelled out in lower case
RSP	responder beacon	responder beacon	4th Case - acronyms spelled out in lower case
RSS	root sum square	root sum square	4th Case - acronyms spelled out in lower case
RTHL	RWY THR light(s)	RWY THR light(s)	4th Case - acronyms spelled out in lower case
RTODAH	rejected take-off distance available, helicopter	rejected take-off distance available, helicopter	4th Case - acronyms spelled out in lower case
RTS	return to service	return to service	4th Case - acronyms spelled out in lower case
RTT	radioteletypewriter	radioteletypewriter	4th Case - acronyms spelled out in lower case
RTZL	RWY touchdown zone light(s)	RWY touchdown zone light(s)	4th Case - acronyms spelled out in lower case
RUT	standard regional route transmitting frequencies	standard regional route transmitting frequencies	4th Case - acronyms spelled out in lower case
RV	rescue vessel	rescue vessel	4th Case - acronyms spelled out in lower case
SD	standard deviation	standard deviation	4th Case - acronyms spelled out in lower case
SDBY	stand by	stand by	4th Case - acronyms spelled out in lower case
SDF	step down fix	step down fix	4th Case - acronyms spelled out in lower case
SE	south-east	south-east	4th Case - acronyms spelled out in lower case
SEB	south-eastbound	south-eastbound	4th Case - acronyms spelled out in lower case
SIF	selective identification feature	selective identification feature	4th Case - acronyms spelled out in lower case
SIWL	single isolated wheel load	single isolated wheel load	4th Case - acronyms spelled out in lower case
SLP	speed limiting point	speed limiting point	4th Case - acronyms spelled out in lower case
SOC	start of climb	start of climb	4th Case - acronyms spelled out in lower case
SPI	special position indicator	special position indicator	4th Case - acronyms spelled out in lower case
SPL	supplementary flight plan	supplementary flight plan	4th Case - acronyms spelled out in lower case
SPOC	SAR point of contact	SAR point of contact	4th Case - acronyms spelled out in lower case
SPOT	spot wind	spot wind	4th Case - acronyms spelled out in lower case
SRG	short range	short range	4th Case - acronyms spelled out in lower case
SSB	single sideband	single sideband	4th Case - acronyms spelled out in lower case
SSE	south-south-east	south-south-east	4th Case - acronyms spelled out in lower case
SST	supersonic transport	supersonic transport	4th Case - acronyms spelled out in lower case
SSW	south-south-west	south-south-west	4th Case - acronyms spelled out in lower case
STA	straight-in approach	straight-in approach	4th Case - acronyms spelled out in lower case
STOL	short take-off and landing	short take-off and landing	4th Case - acronyms spelled out in lower case
STWL	stopway lights	stopway lights	4th Case - acronyms spelled out in lower case
SW	south-west	south-west	4th Case - acronyms spelled out in lower case
SWB	south-westbound	south-westbound	4th Case - acronyms spelled out in lower case
TA	traffic advisory	traffic advisory	4th Case - acronyms spelled out in lower case
TECR	technical reason	technical reason	4th Case - acronyms spelled out in lower case
TIP	until past… (place)	until past… (place)	4th Case - acronyms spelled out in lower case
TNA	turn altitude	turn altitude	4th Case - acronyms spelled out in lower case
TNH	turn height	turn height	4th Case - acronyms spelled out in lower case
TOC	top of climb	top of climb	4th Case - acronyms spelled out in lower case
TOP	cloud top	cloud top	4th Case - acronyms spelled out in lower case
TWYL	taxiway-link	taxiway-link	4th Case - acronyms spelled out in lower case
TYP	type of aircraft	type of aircraft	4th Case - acronyms spelled out in lower case
UA	unmanned acft	unmanned acft	4th Case - acronyms spelled out in lower case
UAB	until advised by	until advised by	4th Case - acronyms spelled out in lower case
UHDT	unable higher due traffic	unable higher due traffic	4th Case - acronyms spelled out in lower case
ULM	ultralight motorized acft	ultralight motorized acft	4th Case - acronyms spelled out in lower case
ULR	ultra long range	ultra long range	4th Case - acronyms spelled out in lower case
UNAP	unable to approve	unable to approve	4th Case - acronyms spelled out in lower case
VA	heading to an altitude	heading to an altitude	4th Case - acronyms spelled out in lower case
VAL	in valleys	in valleys	4th Case - acronyms spelled out in lower case
VAN	RWY control van	RWY control van	4th Case - acronyms spelled out in lower case
VAR	visual-aural radio range	visual-aural radio range	4th Case - acronyms spelled out in lower case
VI	heading to an intercept	heading to an intercept	4th Case - acronyms spelled out in lower case
VLR	very long range	very long range	4th Case - acronyms spelled out in lower case
VM	heading to a manual termination	heading to a manual termination	4th Case - acronyms spelled out in lower case
VOT	VOR airborne equipment test facility	VOR airborne equipment test facility	4th Case - acronyms spelled out in lower case
VPA	vertical path angle	vertical path angle	4th Case - acronyms spelled out in lower case
VPT	visual manoeuvre with prescribed track	visual manoeuvre with prescribed track	4th Case - acronyms spelled out in lower case
VSA	by visual reference to the ground	by visual reference to the ground	4th Case - acronyms spelled out in lower case
VSP	vertical speed	vertical speed	4th Case - acronyms spelled out in lower case
VTF	vector to final	vector to final	4th Case - acronyms spelled out in lower case
WAFC	world area forecast centre	world area forecast centre	4th Case - acronyms spelled out in lower case
WBAR	wing bar lights	wing bar lights	4th Case - acronyms spelled out in lower case
WDSPR	widespread	widespread	4th Case - acronyms spelled out in lower case
WNW	west-north-west	west-north-west	4th Case - acronyms spelled out in lower case
WSW	west-south-west	west-south-west	4th Case - acronyms spelled out in lower case
WX	weather	weather	4th Case - acronyms spelled out in lower case
AAIM	Aircraft Autonomous Integrity Monitoring	Aircraft Autonomous Integrity Monitoring	5th Case - acronyms spelled out in Sentence Case+D1
AAL	Above Aerodrome Level	Above Aerodrome Level	5th Case - acronyms spelled out in Sentence Case
ADA	Advisory Area	Advisory Area	5th Case - acronyms spelled out in Sentence Case
ADC	Aerodrome Chart	Aerodrome Chart	5th Case - acronyms spelled out in Sentence Case
AFS	Aeronautical Fixed Service	Aeronautical Fixed Service	5th Case - acronyms spelled out in Sentence Case
AIM	Aeronautical Information Management	Aeronautical Information Management	5th Case - acronyms spelled out in Sentence Case
ALS	Approach Lighting System	Approach Lighting System	5th Case - acronyms spelled out in Sentence Case
AMA	Area Minimum ALT	Area Minimum ALT	5th Case - acronyms spelled out in Sentence Case
ARC	Area Chart	Area Chart	5th Case - acronyms spelled out in Sentence Case
ATCSMAC	ATC Surveillance Minimum ALT Chart	ATC Surveillance Minimum ALT Chart	5th Case - acronyms spelled out in Sentence Case
CDO	Continuous Descent Operations	Continuous Descent Operations	5th Case - acronyms spelled out in Sentence Case
CRP	Compulsory Reporting Point	Compulsory Reporting Point	5th Case - acronyms spelled out in Sentence Case
CRC	Cyclic Redundancy Check	Cyclic Redundancy Check	5th Case - acronyms spelled out in Sentence Case
D	Danger Area	Danger Area	5th Case - acronyms spelled out in Sentence Case
DCPC	Direct Controller-Pilot Communication	Direct Controller-Pilot Communication	5th Case - acronyms spelled out in Sentence Case
FMC	Flight Management Computer	Flight Management Computer	5th Case - acronyms spelled out in Sentence Case
FMS	Flight Management System	Flight Management System	5th Case - acronyms spelled out in Sentence Case
FMU	Flow Management Unit	Flow Management Unit	5th Case - acronyms spelled out in Sentence Case
GCA	Ground Controlled APP	Ground Controlled APP	5th Case - acronyms spelled out in Sentence Case
GES	Ground Earth Station	Ground Earth Station	5th Case - acronyms spelled out in Sentence Case
GMC	Ground Movement Chart	Ground Movement Chart	5th Case - acronyms spelled out in Sentence Case
GPU	Ground Power Unit	Ground Power Unit	5th Case - acronyms spelled out in Sentence Case
GPWS	Ground Proxmity Warning Area	Ground Proxmity Warning Area	5th Case - acronyms spelled out in Sentence Case
GRASS	Grass Landing Area	Grass Landing Area	5th Case - acronyms spelled out in Sentence Case
LTA	Lower Control Area	Lower Control Area	5th Case - acronyms spelled out in Sentence Case
MAA	Max Authorised ALT	Max Authorised ALT	5th Case - acronyms spelled out in Sentence Case
MCA	Minimum Crossing ALT	Minimum Crossing ALT	5th Case - acronyms spelled out in Sentence Case
MEA	Miminum ENR ALT	Miminum ENR ALT	5th Case - acronyms spelled out in Sentence Case
MHA	Minimum Holding ALT	Minimum Holding ALT	5th Case - acronyms spelled out in Sentence Case
MNPS	Minimum Navigation Performance Specifications	Minimum Navigation Performance Specifications	5th Case - acronyms spelled out in Sentence Case
MRA	Minimum Reception ALT	Minimum Reception ALT	5th Case - acronyms spelled out in Sentence Case
MSA	Minimum Sector ALT	Minimum Sector ALT	5th Case - acronyms spelled out in Sentence Case
MOCA	Minimum Obstacle Clearance ALT	Minimum Obstacle Clearance ALT	5th Case - acronyms spelled out in Sentence Case
MSAS	Multifunctional Transport Satellite Satellite-based Augmentation System	Multifunctional Transport Satellite Satellite-based Augmentation System	5th Case - acronyms spelled out in Sentence Case
NOZ	Normal Operating Zone	Normal Operating Zone	5th Case - acronyms spelled out in Sentence Case
NTZ	No Transgression Zone	No Transgression Zone	5th Case - acronyms spelled out in Sentence Case
OAS	Obstacle Assessment Surface	Obstacle Assessment Surface	5th Case - acronyms spelled out in Sentence Case
OCA	Oceanic Control Area	Oceanic Control Area	5th Case - acronyms spelled out in Sentence Case
OCS	Obstacle Clearance Surface	Obstacle Clearance Surface	5th Case - acronyms spelled out in Sentence Case
OFZ	Obstacle Free Zone	Obstacle Free Zone	5th Case - acronyms spelled out in Sentence Case
OIS	Obstacle Identification Surface	Obstacle Identification Surface	5th Case - acronyms spelled out in Sentence Case
OTS	Organised Track System	Organised Track System	5th Case - acronyms spelled out in Sentence Case
PALS	Precision Approach Lighting System	Precision Approach Lighting System	5th Case - acronyms spelled out in Sentence Case
P	Prohibited Area	Prohibited Area	5th Case - acronyms spelled out in Sentence Case
PTS	Polar Track Structure	Polar Track Structure	5th Case - acronyms spelled out in Sentence Case
R	Restricted Area	Restricted Area	5th Case - acronyms spelled out in Sentence Case
RASC	Regional AIS System Centre	Regional AIS System Centre	5th Case - acronyms spelled out in Sentence Case
RASS	Remote Altimeter Setting Source	Remote Altimeter Setting Source	5th Case - acronyms spelled out in Sentence Case
RCA	Reach Cruising ALT	Reach Cruising ALT	5th Case - acronyms spelled out in Sentence Case
RFFS	Rescue and Fire Fighting Services	Rescue and Fire Fighting Services	5th Case - acronyms spelled out in Sentence Case
RPS	Radar Position Symbol	Radar Position Symbol	5th Case - acronyms spelled out in Sentence Case
RVA	RWY Vectoring Area	RWY Vectoring Area	5th Case - acronyms spelled out in Sentence Case
SALS	Simple Approach Lighting Systems	Simple Approach Lighting Systems	5th Case - acronyms spelled out in Sentence Case
SMC	Surface Movement Control	Surface Movement Control	5th Case - acronyms spelled out in Sentence Case
SMR	Surface Movement Radar	Surface Movement Radar	5th Case - acronyms spelled out in Sentence Case
SRR	SAR Region	SAR Region	5th Case - acronyms spelled out in Sentence Case
TAA	Terminal Arrival ALT	Terminal Arrival ALT	5th Case - acronyms spelled out in Sentence Case
TCH	THR Crossing Height	THR Crossing Height	5th Case - acronyms spelled out in Sentence Case
TGS	Taxiing Guidance System	Taxiing Guidance System	5th Case - acronyms spelled out in Sentence Case
TIBA	Traffic Information Broadcast by Aircraft	Traffic Information Broadcast by Aircraft	5th Case - acronyms spelled out in Sentence Case
TRA	Temporary Reserved Airspace	Temporary Reserved Airspace	5th Case - acronyms spelled out in Sentence Case
UAR	Upper Air Route	Upper Air Route	5th Case - acronyms spelled out in Sentence Case
UIC	Upper Information Centre	Upper Information Centre	5th Case - acronyms spelled out in Sentence Case
YCZ	Yellow Caution Zone	Yellow Caution Zone	5th Case - acronyms spelled out in Sentence Case
C	C	degrees Celsius	6th Case - units of measurement
FT	ft	foot/feet	6th Case - units of measurement
HPA	hPa	hectopascal	6th Case - units of measurement
HZ	Hz	hertz	6th Case - units of measurement
HR	HR	hour	6th Case - units of measurement
KG	kg	kilogram	6th Case - units of measurement
KM	km	kilometer	6th Case - units of measurement
KMH	kmh	kilometer per hour	6th Case - units of measurement
KPA	kPa	kilopascal	6th Case - units of measurement
KW	kW	kilowatt	6th Case - units of measurement
KT	kt	knots	6th Case - units of measurement
LITRE	litre	litre	6th Case - units of measurement
MHZ	MHz	megahertz	6th Case - units of measurement
M	m	metre	6th Case - units of measurement
MIN	min	minute	6th Case - units of measurement
NM	NM	nautical mile	6th Case - units of measurement
SEC	sec	second	6th Case - units of measurement

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