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titlePage Table of Content

Table of Contents

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For Route Segment, PANS-AIM requires some basic properties as part of the minimum AIP data set. This is

...,from point, to point, track, distance, upper limit, lower limit, MEA, MOCA, ...

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The length attribute allows to define the distance of the path of the RouteSegment. The length depends on the pathType, which may be a great circle ('GRC'), a rhumbline ('RHL') or a geodesic line ('GDS'). 

Note
titleNote
According to PANS-AIM, the length of a route segment shall be provided as geodesic distance

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Warning
titleAIXm AIXM 5.1(.1) issue_006_RouteSegment.length

PANS-AIM defines an accuracy for the values for the length of an Route Segment. There is no dedicated attribute in AIXM 5.1(.1) does not provide a dedicated accuracy attribute for length. It can only be encoded using a corresponding annotation for the length attribute.1.

Workaround: A Note may be used to encode that information.

Status: See CCB AIXM-269.

Lateral Limits

For "ENR 3.1 Lower ATS routes" and "ENR 3.2 Upper ATS routes", PANS-AIM requires the provision of lateral limits.

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Minimum en-
PANS-AIMAIXM 5.1.1
Remarks
PropertyDefinition/DescriptionRelevanceAttributeDescription
Upper limitThe upper limit of the route segmentENR 3.1-3.4upperLimitThe vertical position of the route segment ceiling.


Lower LimitThe lower limit of the route segmentENR 3.1-3.4 (Note 2)lowerLimitThe vertical position of the route segment floor.
Note
titleNote 2

According to PANS-AIM for ENR 3.1 Lower ATS Route,

lower limits or minimum en-route altitudes

shall be defined.

In the "old" ICAO Annex 15 it was

lower limits or minimum flight altitudes

Minimum obstacle clearance altitude (MOCA)The minimum altitude for a defined segment of flight that provides the required obstacle clearance. minimumObstacleClearingAltitudeENR 3.1 Lower ATS Route

minimumObstacleClearanceAltitude,

RouteSegment.annotation.Note.propertyNamevalue equal-to 'minimumObstacleClearanceAltitude'



Minimum obstacle clearance altitude (MOCA). The minimum altitude for a defined segment of flight that provides the required obstacle clearance.

According to ICAO PANS-OPS 

A MOCA is determined and published for each segment of the route.

In PANS-AIM it is only required for ENR 3.1 Lower ATS Routes.

The MOC value to be applied in the primary area for the en-route phase of an IFR flight is 300 m (1 000 ft) as a minimum.


Warning
titleAIXM 5.1.1 issue_008_MOCA

PANS-AIM requires a accuracy to be specified for the MOCA. AIXM 5.1(.1) does not have a dedicated attribute for that purpose. A Note can be used to code that information.

.

Workaround for AIXM 5.1(.1): Code a corresponding Note.

Status: For AIXM 5.2 see CCB AIXM-269.

Minimum en-route altitude (MEA)The altitude for an en-route segment that provides adequate reception of relevant navigation facilities and ATS communications, complies with the airspace structure and provides the required obstacle clearance.ENR 3.1 Lower ATS Route (Note 2)

minimumEnrouteAltitude,

RouteSegment.annotation.Note.propertyNamevalue equal-to 'minimumEnrouteAltitude'



Minimum en-route altitude (MEA). The altitude for an en-route segment that provides adequate reception of relevant navigation facilities and ATS communications, complies with the airspace structure and provides the required obstacle clearance.

According to ICAO PANS-OPS

The MEA is the greatest of:

  • the MOCA;
  • the minimum altitude for proper reception of the relevant facilities;
  • the minimum altitude for proper reception of ATS communications;
  • the minimum altitude that complies with the ATS structure.
Warning
titleAIXM 5.1.1 issueissue007_MEA

PANS-AIM requires a accuracy to be specified for the MEA. AIXM 5.1(.1 ) does not have a dedicated attribute for that purpose. A Note can be used to code that information.

Workaround for AIXM 5.1(.1): Code a corresponding Note.

Status: For AIXM 5.2 see CCB AIXM-269.

Minimum flight altitudeMinimum flight altitudeENR 3.4 Helicopter routes


minimumObstacleClearanceAltitude,

RouteSegment.annotation.Note.propertyNamevalue equal-to 'minimumObstacleClearanceAltitude'



According to PANS-AIM

The criteria used to determine minimum flight altitudes shall be provided in GEN 3.3.5.

In PANS-AIM the term is only used for "ENR 3.4 Helicopter routes"

ICAO Annex 11, 2.23 Minimum flight altitudes

Minimum flight altitudes shall be determined and promulgated by each Contracting State for each ATS route and control area over its territory. The minimum flight altitudes determined shall provide a minimum clearance above the controlling obstacle located within the areas concerned.

NANANAminimumCrossingAtEndThe lowermost vertical position at the end point, when flying on the route portion in the direction indicated in the RoutePortionUsage.


RoutePortionUsage is not defined in AIXM
Warning
Warning
titleAIXM 5.1.1 issue
_009_Minimum fight altitude

 AIXM 5.1.1 . If this attribute is related to the route portion, why is it part of the RouteSegment class?

NANANAmaximumCrossingAtEndThe uppermost vertical position at the end point, when flying on the route portion in the direction indicated in the RoutePortionUsage.Same issue as above.

does not have a dedicated attribute for that purpose.

As, in PANS-AIM there is no definition for for Minimum flight altitude. For this mapping it is assumed that it may be the either the MEA or the MOCA for helicopters.

Workaround for AIXM 5.1(.1): Code a RouteSegment.minimumObstacleClearanceAltitude, 
or RouteSegment.minimumEnrouteAltitude.

Status: To be reported to CCB

Note
titleNote 1
PANS-AIM defines more vertical limits, i.e. Area Minimum Altitude (AMA) and Minimum Vectoring Altitude (MVA) which are not considered as part of the AIP Data set and hence are not contained in the table.

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