ID:	AIXM-516
target version:	AIXM 5.2
version:	1.0
last updated:	08 AUG 2022
status:	APPROVED

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

[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:

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 Input	AIXM Output
Forward RunwayCondition 5.1.1 input message:AIXMBasicMessage message:hasMember AirportHeliport gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41bb timeSlice AirportHeliportTimeSlice gml:validTime gml:TimePeriod gml:beginPosition = 2021-02-25 gml:endPosition = 2021-04-22 interpretation = BASELINE sequenceNumber = 1 featureLifetime gml:TimePeriod gml:beginPosition = 2009-01-01T00:00:00Z gml:endPosition = designator = KEWR message:hasMember Runway gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41ba timeSlice RunwayTimeSlice gml:validTime gml:TimePeriod gml:beginPosition = 2021-02-25 gml:endPosition = 2021-04-22 interpretation = BASELINE sequenceNumber = 1 featureLifetime gml:TimePeriod gml:beginPosition = 2009-01-01T00:00:00Z gml:endPosition = designator = 2L type = RWY associatedAirportHeliport = urn:uuid:fac34bfc-fc4f-4da7-ad8a-84ee687f41bb overallContaminant RunwayContamination frictionEstimation = OTHER:RWYCC_0 layer SurfaceContaminationLayer type = OTHER:WET_ICE ______________________________________________________ Backward RunwayCondition 5.2 input message:AIXMBasicMessage message:hasMember AirportHeliport gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41bb timeSlice AirportHeliportTimeSlice gml:validTime gml:TimePeriod gml:beginPosition = 2021-02-25 gml:endPosition = 2021-04-22 interpretation = PERMDELTA sequenceNumber = 1 featureLifetime gml:TimePeriod gml:beginPosition = 2009-01-01T00:00:00Z gml:endPosition = designator = KEWR message:hasMember Runway gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41ba timeSlice RunwayTimeSlice gml:validTime gml:TimePeriod gml:beginPosition = 2021-02-25 gml:endPosition = 2021-04-22 interpretation = PERMDELTA sequenceNumber = 1 featureLifetime gml:TimePeriod gml:beginPosition = 2009-01-01T00:00:00Z gml:endPosition = designator = 2L type = RWY associatedAirportHeliport = urn:uuid:fac34bfc-fc4f-4da7-ad8a-84ee687f41bb overallContaminant RunwayContamination frictionEstimation = RWYCC_0 layer SurfaceContaminationLayer type = WET_ICE	Forward RunwayCondition 5.2 output message:AIXMBasicMessage message:hasMember AirportHeliport gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41bb timeSlice AirportHeliportTimeSlice gml:validTime gml:TimePeriod gml:beginPosition = 2021-02-25 gml:endPosition = 2021-04-22 interpretation = PERMDELTA sequenceNumber = 1 featureLifetime gml:TimePeriod gml:beginPosition = 2009-01-01T00:00:00Z gml:endPosition = designator = KEWR message:hasMember Runway gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41ba timeSlice RunwayTimeSlice gml:validTime gml:TimePeriod gml:beginPosition = 2021-02-25 gml:endPosition = 2021-04-22 interpretation = PERMDELTA sequenceNumber = 1 featureLifetime gml:TimePeriod gml:beginPosition = 2009-01-01T00:00:00Z gml:endPosition = designator = 2L type = RWY associatedAirportHeliport = urn:uuid:fac34bfc-fc4f-4da7-ad8a-84ee687f41bb overallContaminant RunwayContamination frictionEstimation = RWYCC_0 layer SurfaceContaminationLayer type = WET_ICE ______________________________________________________ Backward RunwayCondition 5.1.1 output message:AIXMBasicMessage message:hasMember AirportHeliport gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41bb timeSlice AirportHeliportTimeSlice gml:validTime gml:TimePeriod gml:beginPosition = 2021-02-25 gml:endPosition = 2021-04-22 interpretation = BASELINE sequenceNumber = 1 featureLifetime gml:TimePeriod gml:beginPosition = 2009-01-01T00:00:00Z gml:endPosition = designator = KEWR message:hasMember Runway gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41ba timeSlice RunwayTimeSlice gml:validTime gml:TimePeriod gml:beginPosition = 2021-02-25 gml:endPosition = 2021-04-22 interpretation = BASELINE sequenceNumber = 1 featureLifetime gml:TimePeriod gml:beginPosition = 2009-01-01T00:00:00Z gml:endPosition = designator = 2L type = RWY associatedAirportHeliport = urn:uuid:fac34bfc-fc4f-4da7-ad8a-84ee687f41bb overallContaminant RunwayContamination frictionEstimation = OTHER:RWYCC_0 layer SurfaceContaminationLayer type = OTHER:WET_ICE

AIXM Input

AIXM Output

Forward RunwayCondition 5.1.1 input
message:AIXMBasicMessage
  message:hasMember
    AirportHeliport
      gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41bb
      timeSlice
        AirportHeliportTimeSlice
          gml:validTime
            gml:TimePeriod
              gml:beginPosition = 2021-02-25
              gml:endPosition = 2021-04-22
          interpretation = BASELINE
          sequenceNumber = 1
          featureLifetime
            gml:TimePeriod
              gml:beginPosition = 2009-01-01T00:00:00Z
              gml:endPosition = 
          designator = KEWR
  message:hasMember
    Runway
      gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41ba
      timeSlice
        RunwayTimeSlice
          gml:validTime
            gml:TimePeriod
              gml:beginPosition = 2021-02-25
              gml:endPosition = 2021-04-22
          interpretation = BASELINE
          sequenceNumber = 1
          featureLifetime
            gml:TimePeriod
              gml:beginPosition = 2009-01-01T00:00:00Z
              gml:endPosition = 
          designator = 2L
          type = RWY
          associatedAirportHeliport =  urn:uuid:fac34bfc-fc4f-4da7-ad8a-84ee687f41bb
          overallContaminant
            RunwayContamination
              frictionEstimation = OTHER:RWYCC_0
              layer
                SurfaceContaminationLayer
                  type = OTHER:WET_ICE

______________________________________________________
Backward RunwayCondition 5.2 input
message:AIXMBasicMessage
  message:hasMember
    AirportHeliport
      gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41bb
      timeSlice
        AirportHeliportTimeSlice
          gml:validTime
            gml:TimePeriod
              gml:beginPosition = 2021-02-25
              gml:endPosition = 2021-04-22
          interpretation = PERMDELTA
          sequenceNumber = 1
          featureLifetime
            gml:TimePeriod
              gml:beginPosition = 2009-01-01T00:00:00Z
              gml:endPosition = 
          designator = KEWR
  message:hasMember
    Runway
      gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41ba
      timeSlice
        RunwayTimeSlice
          gml:validTime
            gml:TimePeriod
              gml:beginPosition = 2021-02-25
              gml:endPosition = 2021-04-22
          interpretation = PERMDELTA
          sequenceNumber = 1
          featureLifetime
            gml:TimePeriod
              gml:beginPosition = 2009-01-01T00:00:00Z
              gml:endPosition = 
          designator = 2L
          type = RWY
          associatedAirportHeliport =  urn:uuid:fac34bfc-fc4f-4da7-ad8a-84ee687f41bb
          overallContaminant
            RunwayContamination
              frictionEstimation = RWYCC_0
              layer
                SurfaceContaminationLayer
                  type = WET_ICE

Forward RunwayCondition 5.2 output
message:AIXMBasicMessage
  message:hasMember
    AirportHeliport
      gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41bb
      timeSlice
        AirportHeliportTimeSlice
          gml:validTime
            gml:TimePeriod
              gml:beginPosition = 2021-02-25
              gml:endPosition = 2021-04-22
          interpretation = PERMDELTA
          sequenceNumber = 1
          featureLifetime
            gml:TimePeriod
              gml:beginPosition = 2009-01-01T00:00:00Z
              gml:endPosition = 
          designator = KEWR
  message:hasMember
    Runway
      gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41ba
      timeSlice
        RunwayTimeSlice
          gml:validTime
            gml:TimePeriod
              gml:beginPosition = 2021-02-25
              gml:endPosition = 2021-04-22
          interpretation = PERMDELTA
          sequenceNumber = 1
          featureLifetime
            gml:TimePeriod
              gml:beginPosition = 2009-01-01T00:00:00Z
              gml:endPosition = 
          designator = 2L
          type = RWY
          associatedAirportHeliport =  urn:uuid:fac34bfc-fc4f-4da7-ad8a-84ee687f41bb
          overallContaminant
            RunwayContamination
              frictionEstimation = RWYCC_0
              layer
                SurfaceContaminationLayer
                  type = WET_ICE

______________________________________________________
Backward RunwayCondition 5.1.1 output
message:AIXMBasicMessage
  message:hasMember
    AirportHeliport
      gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41bb
      timeSlice
        AirportHeliportTimeSlice
          gml:validTime
            gml:TimePeriod
              gml:beginPosition = 2021-02-25
              gml:endPosition = 2021-04-22
          interpretation = BASELINE
          sequenceNumber = 1
          featureLifetime
            gml:TimePeriod
              gml:beginPosition = 2009-01-01T00:00:00Z
              gml:endPosition = 
          designator = KEWR
  message:hasMember
    Runway
      gml:identifier = fac34bfc-fc4f-4da7-ad8a-84ee687f41ba
      timeSlice
        RunwayTimeSlice
          gml:validTime
            gml:TimePeriod
              gml:beginPosition = 2021-02-25
              gml:endPosition = 2021-04-22
          interpretation = BASELINE
          sequenceNumber = 1
          featureLifetime
            gml:TimePeriod
              gml:beginPosition = 2009-01-01T00:00:00Z
              gml:endPosition = 
          designator = 2L
          type = RWY
          associatedAirportHeliport =  urn:uuid:fac34bfc-fc4f-4da7-ad8a-84ee687f41bb
          overallContaminant
            RunwayContamination
              frictionEstimation = OTHER:RWYCC_0
              layer
                SurfaceContaminationLayer
                  type = OTHER:WET_ICE

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