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According to ICAO Annex 11

:

The minimum flight altitudes determined shall provide a minimum clearance above the controlling obstacle located within the areas concerned.

...

(.1)
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.The altitude for an en-route segment that

According to ICAO PANS-OPSOPS 

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
Minimum en-route altitude (MEA)

PANS-AIM requires a accuracy 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.


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.
Minimum flight altitudeMinimum flight altitudeENR 3.4 Helicopter routes
Warning
titleAIXM 5.1
.1 issue

PANS-AIM requires a accuracy 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.


Minimum flight altitudeMinimum flight altitudeENR 3.4 Helicopter routes


Warning
titleAIXM 5.1(.1) isseu

AIXM does not have a dedicated attribute for that purpose.


Info
titleOpen Question

Open Question

TBD: Is Minimum flight altitude the same as the MEA or MOCA for fixed wing but for helicopters? Is "Minimum flight altitude" defined somewhere?


Until clarified, mapped to MOCA.

minimumObstacleClearanceAltitude

clarified, mapped to MOCA.

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 concernedand control area over its territory. The minimum flight altitudes determined shall provide a minimum clearance above the controlling obstacle located within the areas concerned.

Warning
titleAIXM 5.1.1 issue

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


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


Warning
titleAIXM 5.1.1 issue

RoutePortionUsage is not defined in 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.

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No.DescriptionXPath Expression

RSG-EX-01

RSG-EX-0204

Route segment of Lower ATS route (incl.  MEA)

Route segment of Lower ATS route (incl. MOCA)

//aixm:RouteSegmentTimeSlice[@gml:id='RSG_A6_BOR_ROB'] |

//aixm:RouteSegmentTimeSlice[@gml:id='RSG_A6_ROB_ROK'] |

RSG-EX-02Route segment of Upper ATS route//aixm:RouteSegmentTimeSlice[@gml:id='RSG_UA4_BARIM_WOB']
RSG-EX-03Route segment of RNAV route//aixm:RouteSegmentTimeSlice[@gml:id='RSG_UL123_ABOLA_ILURU']RSG-EX-04Route segment of Helicpoter routeTBD

References