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In AIXM 5 the runway direction the MLS is provided for has to be coded using the Navaid.runwayDirection property. The corresponding relationship isInstalledAt indicates that the navaid (i.e. the MLS system) is installed at a particular landing area. Hence, not a component of the MLS but the whole MLS system will be related to a particular runway direction. For more information about the coding of an MLS system, see topic Navaid Component & Navaid Colocation.

Coding Rules for MLS

IdentifierData Encoding RuleJustificationData Verification Rule (UID)Remarks
MLS-101The Azimuth.designator attribute is mandatory.Minimum AIP data setTBD
ILZ

MLS-
105
102The Azimuth.channel attribute is mandatory.Minimum AIP data setTBD
ILZ

MLS-
106
103The Azimuth.location property is mandatory.Minimum AIP data setTBD
IGP

MLS-
102
104The Elevation.location property is mandatory.Minimum AIP data setTBD
IGP

MLS-
103
105The
Glidepath
Elevation.angleNominal atribute is mandatory.PANS-AIMTBD
IGP

MLS-
104
106The
Glidepath
Elevation.angleAccuracy
property
attribute should be provided.PANS-AIMTBD
IGP

MLS-
105PANS-AIMTBDIGP-106The Glidepath.rdhAccuracy property
107The
Glidepath.rdh property sis mandatory.
Elevation.angleMinimum attribute should be provided.PANS-AIMTBD
ILZ

MLS-
107
108Either the
Localizer
Azimuth.magneticBearing or the
Localizer
Azimuth.
magneticBearing
trueBearing attribute shall be provided.Minimum AIP data setTBD
ILZ

MLS-
108
109If the
Localizer
Azimuth.magneticBearing is provided than the
Localizer
Azimuth.magneticBearingAccuray should be provided.PANS-AIMTBD
ILZ

MLS-
109
110If the
Localizer
Azimuth.trueBearing is provided than also the
Localizer
Azimuth.trueBearingAccuray should be provided.PANS-AIMTBD
ILZ

MLS-
110The Localizer.declination attribute should be provided.PANS-AIMTBDNAV-901
111If Navaid.type equal-to '
ILS' LOC
MLS or '
ILS_DME' or 'LOC' or '
MLS_DME'  the Navaid.signalPerformance shall be provided.PANS-AIMTBD
NAV

MLS-
902
112The Navaid.signalPerformance and the related RunwayDirection.precisionAppraochGuidance shall be consistent.Data consistancyTBDFor example if signalPerformance is CAT IIIA also the precisionAppraochGuidance shall be CAT IIIA.
ILZ-111The Localizer.backCourseUsable attribute should be provided.PANS-AIMTBDILZ-112
MLS-113If Navaid.type equal-to '
ILS
MLS' or '
ILS
MLS_DME
' or 'LOC
'
or 'LOC_DME' 
it must have exactly one NavaidEquipment which is a
Localizer
Azimuth.
EAD /
Data consistancyTBD
NAV

MLS-
903
114If Navaid.type equal-to '
ILS
MLS' or '
ILS
MLS_DME' it must have exactly one NavaidEquipment which is a
Glidepath
Azimuth.Data consistancyTBD
NAV

MLS-
904If Navaid.type equal-to 'ILS_DME'  or 'LOC_DME' it must have exactly one NavaidEquipment which is a DME.Data consistancyTBDILZ-113The Localizer
115The value of the DME.channel of the related DME must be paired with the Azimuth.Channel as described by Table A, ICAO Annex 10, Vol.1.EAD

MLS-116The Azimuth.location must be plausibly close (less than 1 KM) to that of the end of the related (through Navaid.runwayDirection) RunwayDirection.EAD / Data consistancyTBD
ILZ

MLS-
114
117

The difference

between Localizer

between Azimuth.magneticBearing  and the related RunwayDirection.magneticBearing (through Navaid.runwayDirection)  cannot exceed 10 degrees.

EAD / ICAO Doc 8168, PANS OPSTBD
ILZ

MLS-
115
118The difference
between Localizer
between Azimuth.trueBearing
and Localizer
and Azimuth.magneticBearing has to be consistent with the value
VAL_MAG_VAR in the referred AD_HP
of the AirportHeliport.magneticVariation of the related AirportHeliport ( trough Navaid.servedAirport), taking in consideration the current date and the annual rate of change (
VAL_MAG_VAR_CHG in the referred AD_HP
AirportHeliport.magneticVariationChange).EADTBD
ILZ

MLS-
116EAD/ ICAO Annex 10, Vol. 1TBDIGP-107The Glidepath.
119The
value of the Localizer.frequency has to lie between '108' 'MHz' and '111.975' 'MHz'
Elevation.location must be plausibly close (less than 1 KM) to that of the threshold of the related (through Navaid.runwayDirection) RunwayDirection.EADTBD
IGP

MLS-
108The value of the Glidepath.frequency has to lie between '328.6' 'MHz' and '335.4' 'MHz'.EAD/ ICAO Annex 10, Vol. 1TBDIGP-109The value of the Glidepath.slope has to lie between '1' and '5' degrees.EAD/ ICAO Annex 10, Vol. 1TBDIGP-110The value of the Glidepath.rdh has to lie between '10' and '25'  'M' (metres)
120  Elevation.angleNominal must be greater than Elevation.angleMinimum.EAD/ ICAO Annex 10, Vol. 1TBD

Coding Examples

The figure below shows an outdated publication of an MLS in an AIP.

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