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The diagram below shows the AIXM classes, including the relevant data types, needed to encode that information:
Start Point & End Point
Route Segment ICAO defines a route segment as
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ENR 3.1 (Lower ATS Routes):
- upper and lower limits or minimum en-route altitudes.
- minimum obstacle clearance altitudes;
- Since en-route flights at or above the lowest usable flight level are flown at flight levels, it is suggested that these limits be expressed in flight levels (FL) whenever such flight levels are not likely to fall below the lowest safe altitude; otherwise, they should be expressed in altitude.
ENR 3.2 (Upper ATS Routes):
- upper and lower limits (usually in flight levels "FL”).
ENR 3.3 (RNAV Routes):
- upper and lower limits (usually in flight levels "FL”).
ENR 3.4 (Helicopter Routes):
- upper and lower limits; minimum flight altitudes
ENR 3.5 (Other Routes):
- No requirements stated regarding vertical limits.
The following table gives an overview which vertical limits are required by PANS-AIM for the AIP data set and the corresponding AIXM attributes of the RouteSegment class (Note 1):
| PANS-AIM | AIXM 5.1.1 | Remarks | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Property | Definition/Description | Relevance | Attribute | Description | ||||||||||||||||
| Upper limit | The upper limit of the route segment | ENR 3.1-3.4 | upperLimit | The vertical position of the route segment ceiling. | ||||||||||||||||
| Lower Limit | The lower limit of the route segment | ENR 3.1-3.4 (Note 2) | lowerLimit | The vertical position of the route segment floor. |
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| Minimum obstacle clearance altitude (MOCA) | The minimum altitude for a defined segment of flight that provides the required obstacle clearance. minimumObstacleClearingAltitude | ENR 3.1 Lower ATS Route | minimumObstacleClearanceAltitude | Minimum obstacle clearance altitude (MOCA). The minimum altitude for a defined segment of flight that provides the required obstacle clearance. | According to PANS-OPS
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. | |||||||||||||||
| 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 | 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 PANS-OPS
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| Minimum flight altitude | Minimum flight altitude | ENR 3.4 Helicopter routes | ??? | According to PANS-AIM In PANS-AIM the term is only used for "ENR 3.4
| According to PANS-AIM
In PANS-AIM the term is only used for "ENR 3.4 Helicopter routes" ICAO Annex 11, 2.22 23 Minimum flight altitudes
Info |
Isn't acc. to Annex 11 the MOCA and the Minimum flight altitude for Routes? Or is both the MEA and the MOCA considered as a kind of minimum flight altitude (see also change for ENR 3.1 Lower ATS routes?
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| NA | NA | NA | minimumCrossingAtEnd | The lowermost vertical position at the end point, when flying on the route portion in the direction indicated in the RoutePortionUsage. |
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| NA | NA | NA | maximumCrossingAtEnd | The 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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More coding examples can be found in the AIXM DONLON AIP data set.
| No. | Description | XPath Expression | ||||
|---|---|---|---|---|---|---|
RSG-EX-01 RSG-EX-02 | Route segment of Lower ATS route (incl. | Description | XPath Expression | RSG-EX-01 | MEA) Route segment of Lower ATS route TBD(incl. MOCA) | //aixm:RouteSegmentTimeSlice[@gml:id='RSG_A6_BOR_ROB'] | //aixm:RouteSegmentTimeSlice[@gml:id='RSG_A6_ROB_ROK'] | |
| RSG-EX-02 | Route segment of Upper ATS route | //aixm:RouteSegmentTimeSlice[@gml:id='RSG_UA4_BARIM_WOB'] | ||||
| RSG-EX-03 | Route segment of RNAV route | //aixm:RouteSegmentTimeSlice[@gml:id='RSG_UL123_ABOLA_ILURU'] | ||||
| RSG-EX-04 | Route segment of Helicpoter route | TBD |