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ID:

AIXM-516

target version:

AIXM 5.2

version:

1.0

last updated:

08 AUG 2022

status:

APPROVED


Table of Contents
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Description

Additional values are introduced for CodeFrictionEstimateType and CodeContaminationType in response to the new runway condition report (RCR) format.

Rationale for change

For the background information please see https://aixmccb.atlassian.net/browse/AIXM-347.

A new runway condition report (RCR) concept entered into force in November 2021, together with a revised version of the SNOWTAM message structure and content. The main changes are:

  • the introduction of a new runway condition code (RWYCC), replacing the current surface friction estimation codes
  • a revised list of contaminants, including layered values that are indicated with a single code
  • adjustments to other parameters that could be reported such as status of aprons/taxiways, snowbanks outside runway, etc.

These changes are already detailed in the PANS Aerodromes 2nd edition and will be introduced as a consequential amendment in the new PANS-AIM, applicable from November 2021. They are also translated in the EU legislation by means of CIR (EU) 2017/373 as amended by CIR (EU) 2020/469 and CIR (EU) 2020/1177.

In order to support the new RCR concept, the following changes are necessary in the AIXM model:

  • the list of values for the friction estimate needs to include the new runway condition codes;
  • the list of values for contamination layers need to include the new RCR values, some of which indicate combined layers, such as ice with water on top.

Impact assessment

When providing Image Added

[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 ) data to for output towards a system (B) that uses AIXM 5.2 systems, the forward mapping rules described further in this document may be applied.When receiving data from AIXM 5.2 implementations, the backward mapping rules described further in this document may be applied in order to recuperate the data. These conversion rules are based on the current AIXM 5.1(.1) workaroundsfor 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:

For <<data type>> CodeFrictionEstimateType add new values:

  • RWYCC_0 - “Runway condition code 0, determined during the assessment of the runway surface condition.”
  • RWYCC_1 - “Runway condition code 1, determined during the assessment of the runway surface condition.”
  • RWYCC_2 - “Runway condition code 2, determined during the assessment of the runway surface condition.”
  • RWYCC_3 - “Runway condition code 3, determined during the assessment of the runway surface condition.”
  • RWYCC_4 - “Runway condition code 4, determined during the assessment of the runway surface condition.”
  • RWYCC_5 - “Runway condition code 5, determined during the assessment of the runway surface condition.”
  • RWYCC_6 - “Runway condition code 6, determined during the assessment of the runway surface condition.”

For <<data type>> CodeContaminationType add new values:

  • DRY - “Surface free of visible moisture and not contaminated.”
  • STANDING_WATER - “More than 3 mm of water on the surface.”
  • SLIPPERY_WET - ”The surface friction characteristics of have been determined to be degraded on a significant portion of the surface. EASA terminology.” 
  • PREPARED_WINTER_RWY - “A dry frozen surface of compacted snow and/or ice which has been treated with sand or grit or has been mechanically treated to improve friction. EASA terminology.”
  • WET - “Surface is covered by any visible dampness or water up to and including 3 mm deep.”
  • WET_ICE - “Ice with water on top of it or ice that is melting.”
  • DRIFTING_SNOW - “An ensemble of snow particles raised by the wind to small heights above the ground.”
  • LOOSE_SAND - “Loose sand.”
  • CHEMICAL_TREATMENT - “Chemically treated surface.”

For <<data type>> CodeContaminationType delete value:

  • DAMP - “A wee bit wet”.

The UML class diagram to the right shows the modified lists of values.

Mapping AIXM 5.1.1 to AIXM 5.2 (forward)

[MAPC-01] For each SurfaceContaminationLayer that has one of the following type values:

  • “OTHER:DRY” - Replace the value with “DRY”
  • “OTHER:STANDING_WATER - Replace the value with “STANDING_WATER”
  • OTHER:SLIPPERY_WET - Replace the value with “SLIPPERY_WET”
  • OTHER:PREPARED_WINTER_RUNWAY - Replace the value with “SPECIALLY_PREPARED_WINTER_RUNWAY”
  • OTHER:WET - Replace the value with “WET”
  • DAMP - Replace the value with “WET”
  • OTHER:WET_ICE - Replace the value with “WET_ICE”
  • OTHER:DRIFTING_SNOW - Replace the value with “DRIFTING_SNOW”
  • OTHER:LOOSE_SAND - Replace the value with “LOOSE_SAND”
  • OTHER:CHEMICAL_TREATMENT - Replace the value with “CHEMICAL_TREATMENT”

[MAPC-01] For each SurfaceContamination that has one of the following frictionEstimation values:

  • OTHER:RWYCC_0 - Replace the value with “RWYCC_0”
  • OTHER:RWYCC_1 - Replace the value with “RWYCC_1”
  • OTHER:RWYCC_2 - Replace the value with “RWYCC_2”
  • OTHER:RWYCC_3 - Replace the value with “RWYCC_3”
  • OTHER:RWYCC_4 - Replace the value with “RWYCC_4”
  • OTHER:RWYCC_5 - Replace the value with “RWYCC_5”
  • OTHER:RWYCC_6 - Replace the value with “RWYCC_6”

Mapping AIXM 5.2 to AIXM 5.1.1 (backward)

[MAPC-01] For each SurfaceContaminationLayer that has one of the following type values:

  • DRY - Replace the value with “OTHER:DRY”
  • STANDING_WATER - Replace the value with “OTHER:STANDING_WATER”
  • SLIPPERY_WET - Replace the value with “OTHER:SLIPPERY_WET”
  • PREPARED_WINTER_RUNWAY - Replace the value with “OTHER:PREPARED_WINTER_RUNWAY”
  • WET - Replace the value with “OTHER:WET”
  • WET_ICE - Replace the value with “OTHER:WET_ICE”
  • DRIFTING_SNOW - Replace the value with “OTHER:DRIFTING_SNOW”
  • LOOSE_SAND - Replace the value with “OTHER:LOOSE_SAND”
  • CHEMICAL_TREATMENT - Replace the value with “OTHER:CHEMICAL_TREATMENT”

[MAPC-01] For each SurfaceContamination that has one of the following frictionEstimation values:

  • RWYCC_0 - Replace the value with “OTHER:RWYCC_0”
  • RWYCC_1 - Replace the value with “OTHER:RWYCC_1”
  • RWYCC_2 - Replace the value with “OTHER:RWYCC_2”
  • RWYCC_3 - Replace the value with “OTHER:RWYCC_3”
  • RWYCC_4 - Replace the value with “OTHER:RWYCC_4”
  • RWYCC_5 - Replace the value with “OTHER:RWYCC_5”
  • RWYCC_6 - Replace the value with “OTHER:RWYCC_6”

Mapping example

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

AIXM 5.2InputAIXM 5.1(.1)Output