[2.0] [TWY.CLS] Taxiway - closure (NOTAM)

Text NOTAM production rules

This section provides rules for the automated production of the text NOTAM message items, based on the AIXM 5.1.1 data encoding of the Event. Therefore, AIXM specific terms are used, such as names of features and properties, types of TimeSlices, etc:

the abbreviation TWY.BL indicates that the corresponding data item must be taken from the Taxiway BASELINE;
the abbreviation TWY.TD indicates that the corresponding data item must be taken from the Taxiway TEMPDELTA that was created for the Event in case of complete taxiway closure;
the abbreviation TWE.TD indicates that the corresponding data item must be taken from the TaxiwayElement TEMPDELTA that was created for the Event in case of taxiway portion closure;
the abbreviation AHP.BL indicates that the corresponding data item must be taken from the AirportHeliport BASELINE associated with the Taxiway concerned.
Notes:
1. According to encoding rule ER-02, the TEMPDELTA might also include ManoeuvringAreaAvailability elements that have been copied from the BASELINE data for compliance with the AIXM Temporality rules. The current practice is to not include such static information in the NOTAM text. Therefore, all ManoeuvringAreaAvailability that have operationalStatus='NORMAL' will be ignored for the NOTAM generation.

In general, the ICAO DOC 8126 and the OPADD rules shall be followed. These have not been copied in this document in order to avoid duplication with those documents. Only instructions that are specific to the AIXM encoding of this event are stated here.

Item A

The item A shall be generated according to the general production rules for item A using the Event.concernedAirportHeliport.

Item Q

Apply the common NOTAM production rules for item Q, complemented by the following specific rules for this particular scenario:

Q code

The following mapping shall be used:

*TWY.BL.type*	*Corresponding Q codes*
if other than 'FASTEXIT'	QMXLC
'FASTEXIT'	QMYLC

Scope

Insert the value ‘A’.

Lower limit / Upper limit

Use “000/999”

Geographical reference

Insert the coordinate of the ARP (AHP.BL.ARP.ElevatedPoint) of the airport, formatted as follows:

the set of coordinates comprises 11 characters rounded up or down to the nearest minute; i.e. Latitude (N/S) in 5 characters; Longitude (E/W) in 6 characters;
the radius value is “005”.

Items B, C and D

Items B and C shall be decoded following the common production rules.

If at least one TWY.TD.availability.ManouevringAreaAvailability.timeInterval exists (i.e. the Event has an associated schedule), then all such Timesheet(s) shall be represented in item D according to the common NOTAM production rules for Item D, E - Schedules. Otherwise, item D shall be left empty.

Item E

The following pattern should be used as a base for generating the E field text from the AIXM data:

EBNF Code

template = ["(1)" "AHP.BL.type (2)" ("AHP.BL.name (3a)" | "AHP.BL.ARP (3b)")] \n 
("Rapid exit TWY(4)" | "TWY") "TWY.BL.designator" ["TWY.TD.ManoeuvringAreaAvailability.annotation(5)"] {"(6)" ("and"| ",") ("Rapid exit TWY(4)" | "TWY") "TWY.BL.designator" ["TWY.TD.ManoeuvringAreaAvailability.annotation(5)"]}.

template_bottom = "closed" [ "due to" "TWY.TD.ManoeuvringAreaAvailability.annotation (7)" "."]\n 
{"\n" "TWY.TD.ManoeuvringAreaAvailability.annotation(8)" "."}.

Reference

Data item (from coding scenario)

Rule

(1)

If AHP.BL.locationIndicatorICAO is not null, then ignore this branch.

(2)

Insert here the type of the airport decoded as follows

AHP.BL.type	Text to be inserted in Item E
AD or AH	"AD"
HP	"Heliport"
LS or OTHER	"Landing site"

(3)

(a) If AHP.BL.name is not null, then insert it here. (b) Otherwise, insert here the text "located at" followed by the AHP.BL.ARP.ElevatedPoint decoded according to the text NOTAM production rules for aixm:Point

(4)

if TWY.BL.type ='FASTEXIT' insert the words “Rapid exit TWY". Otherwise insert "TWY".

(5)

closed taxiway description

Insert here the TWY.TD.availability.ManoeuvringAreaAvailability.annotation with purpose='DESCRIPTION' translated into free text according to the decoding rules for annotations.

(6)

taxiway designator

If more than one TWY.TD is associated with the Event, repeat this branch for each such Taxiway. Insert "," before consecutive taxiways and insert "and" before the last taxiway affected by the closure (e.g. "TWY A, TWY B and TWY C")

(7)

closure reason

If there exists TWY.TD.availability.ManoeuvringAreaAvailability.annotation with propertyName='operationalStatus' and purpose='REMARK', then translate it into free text according to the decoding rules for annotations.

(8)

note

Other annotations of TWY.TD.availability.ManoeuvringAreaAvailability shall be translated into free text according to the decoding rules for annotations.

Items F & G

Leave empty.

Event Update

The eventual update of this type of event shall be encoded following the general rules for Event update or cancellation, which provide instructions for all NOTAM fields, except for item E and the condition part of the Q code, in the case of a NOTAMC

If a NOTAMC is produced, then the 4th and 5th letters (the "condition") of the Q code shall be "AK", except for the situation of a “new NOTAM to follow", in which case “XX”shall be used.

The following pattern should be used for automatically generating the E field text from the AIXM data

EBNF Code

template_cancel = ["(1)" "AHP.BL.type (2)" ("AHP.BL.name (3a)" | "AHP.BL.ARP (3b)")  ] ("Rapid exit TWY(4)" | "TWY") "TWY.BL.designator" {"(6)" ("," | "and") ("Rapid exit TWY(4)" | "TWY") "TWY.BL.designator"} ("resumed normal operations." | " : New NOTAM to follow.(9)").

Reference

Rule

(9)

If the NOTAM will be followed by a new NOTAM concerning the same situation, then the operator shall have the possibility to choose the "New NOTAM to follow" branch. This branch cannot be selected automatically because this information is only known by the operator.

Note: in this case, the 4th and 5th letters of the Q code shall also be changed into “XX”.