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[AIXM-524] Conditional altitude termination of a leg

[AIXM-524] Conditional altitude termination of a leg

Owned by georgiana.andrei04
Last updated: 2024 Aug 19 by ADAM STYLES

ID:

AIXM-524

target version:

AIXM 5.2

version:

1.0

last updated:

08 AUG 2022

status:

APPROVED


Description

Additional values supporting conditional altitude termination of a SegmentLeg are added and the clarification of an INTERCEPT definition is introduced.

Rationale for change

See https://aixmccb.atlassian.net/browse/AIXM-477

In the current model it is not possible to indicate that the leg has a conditional altitude termination, meaning the leg ends as specified in the ARINC Path Terminator or at the altitude specified, under the condition indicated which might be "whichever is later" or is "whichever is earlier".

In general the condition relates to a distance/DME distance and an altitude.

Having the ICAO PANS-OPS provisions in mind, the clarification for the endConditionDesignator = “INTERCEPT” definition is also introduced.

Impact assessment

[FWD_MAP_1:1] Data mapping is possible and no data loss occurs when data is exchanged from a system (A) that uses AIXM 5.1.1 for output towards a system (B) that uses AIXM 5.2 for input.

[BWD_MAP_1:1] Data mapping is possible and no data loss occurs when data is exchanged from a system (B) that uses AIXM 5.2 for output towards a system (A) that uses AIXM 5.1.1 for input.

Change Proposal details

In the UML model:

  • In the data type CodeSegmentTerminationBaseType

add the following values:

  • ALTITUDE_AND_DISTANCE, type = string, definition = “Used to indicate that the leg has a conditional altitude termination, meaning the SegmentLeg ends as specified by the distance or at or above the altitude specified, under the condition indicated. Condition is whichever is later (altitude and reaching DME distance/flight distance).”.
  • ALTITUDE_OR_DISTANCE, type = string, definition = “Used to indicate that the leg has a conditional altitude termination, meaning the SegmentLeg ends as specified by the distance or at or above the altitude specified, under the condition indicated. Condition is whichever is earlier (altitude or reaching DME distance/flight distance).”.
  • DME_DISTANCE, type = string, definition = ”Leg is terminated when reaching the limiting distance indication defined by a DME associated with the leg.”

change the definition for INTERCEPT to read:

  • ”Leg is terminated when reaching the limiting angle indication.”

The following UML class diagram shows the modified list of values, with the new values highlighted.


Mapping AIXM 5.1.1 to AIXM 5.2 (forward)

[MAPC-01] The following data conversion algorithm is proposed for (and incl. specialised subclasses) SegmentLeg.endConditionDesignator values:

  • ”OTHER:ALTITUDE_AND_DISTANCE”
    • Replace the value with “ALTITUDE_AND_DISTANCE”
  • ”OTHER:ALTITUDE_OR_DISTANCE”
    • Replace the value with “ALTITUDE_OR_DISTANCE”
  • ”OTHER:DME_DISTANCE”
    • Replace the value with “DME_DISTANCE”

Mapping AIXM 5.2 to AIXM 5.1.1 (backward)

[MAPC-01] The following data conversion algorithm is proposed for (and incl. specialised subclasses) SegmentLeg.endConditionDesignator values:

  • ”ALTITUDE_AND_DISTANCE”
    • Replace the value with “OTHER:ALTITUDE_AND_DISTANCE”
  • ”ALTITUDE_OR_DISTANCE”
    • Replace the value with “OTHER:ALTITUDE_OR_DISTANCE”
  • ”DME_DISTANCE”
    • Replace the value with “OTHER:DME_DISTANCE”

Mapping example

(Note: for mapping test data see: https://github.com/aixm/mapping_52_511/tree/master/AIXM-xxx) 

AIXM InputAIXM Output