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Definition

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The coding rules for the situational awareness section provide two options:

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Identifier

Data encoding rule

ER-01

The surface condition report shall be encoded as:

  • a new Event with a BASELINE TimeSlice ( scenario=”SFC.CON”, version=”2.0”), for which a PERMDELTA TimeSlice may also be provided; and

  • a TimeSlice of type TEMPDELTA for each affected Runway and AirportHeliport feature, for which the "event:theEvent" property points to the Event instance created above.
  • if applicable, additional TEMPDELTA TimeSlices for the affected AirportHeliport,  Taxiway and/or Apron features as detailed below. Such TimeSlice shall have the "event:theEvent" property points to the Event instance created above.
ER-02

The TimeSlice.validTime of the affected Features TEMPDELTAs, the EventTimeSlice.validTime and EventTimeSlice.featureLifetime shall have TimePeriod.beginPosition equal to the latest of all Runway/RunwayContamination.observationTime. coded in relation with the Event

Reason: When reporting on more than one runway and individual dates/times of observation/assessment are indicated by repeated Item B, the latest date/time of observation/assessment is inserted in the abbreviated heading. This is considered the start of the SNOWTAM validity.

ER-03

The TimeSlice.validTime of the affected Features TEMPDELTAs, the EventTimeSlice.validTime and EventTimeSlice.featureLifetime shall have TimePeriod.endPosition set 8h after the TimePeriod.beginPosition.

Reason: Maximum SNOWTAM validity is 8h.

ER-04

All three sections (thirds) shall always be present and each of the following values shall only be used once for the Runway/RunwaySectionContamination.section:

  • 1_THIRD
  • 2_THIRD
  • 3_THIRD


ER-05

Only the following values are allowed for Runway/RunwaySectionContamination.frictionEstimation:

  • OTHER:RWYCC_0
  • OTHER:RWYCC_1
  • OTHER:RWYCC_2
  • OTHER:RWYCC_3
  • OTHER:RWYCC_4
  • OTHER:RWYCC_5
  • OTHER:RWYCC_6


ER-06

Only the following values shall be used for Runway/RunwaySectionContamination/SurfaceContaminationLayer.type:

  • COMPACT_SNOW
  • DRY_SNOW
  • FROST
  • ICE
  • SLUSH

  • OTHER:DRY

  • OTHER:STANDING_WATER
  • OTHER:SLIPPERY_WET (Note: EASA)
  • OTHER:PREPARED_WINTER_RUNWAY (Note: EASA)
  • OTHER:WET
  • OTHER:WET_ICE
  • WET_SNOW


ER-07

Only the following values shall be used for Runway/overallContaminant/.overallContaminant.RunwayContamination.layer.SurfaceContaminationLayer.type and/or for the AirportHeliport.contaminant.AirportHeliportContamination.layer.SurfaceContaminationLayer.type:

  • OTHER:DRIFTING_SNOW
  • OTHER:LOOSE_SAND
  • OTHER:CHEMICAL_TREATMENT
ER-08

In case of multiple Runway/RunwaySectionContamination/SurfaceContaminationLayer.layerOrder, only the following combinations are allowed:

  • layerOrder='1', type='DRY_SNOW' and layerOrder='2', type='COMPACT_SNOW'
  • layerOrder='1', type='DRY_SNOW' and layerOrder='2', type='ICE'
  • layerOrder='1', type='OTHER:STANDING_WATER' and layerOrder='2',type='COMPACT_SNOW'
  • layerOrder='1', type='WET_SNOW' and layerOrder='2', type='COMPACT_SNOW'
  • layerOrder='1', type='WET_SNOW' and layerOrder='2', type='ICE'
ER-09

The maximum value of Runway/RunwaySectionContamination/SurfaceContaminationLayer.layerOrder is 2.

ER-10snowbanks adjacent to the runway shall be encoded as Runway/.overallContamination.RunwayContamination/Ridge.annotationwith purpose.Note with purpose='REMARK' , propertyName='WARNINGcriticalRidge'  and note='Snowbanks present adjacent to the runway'
ER-11

When snowbanks are present on the runway, their presence shall be encoded as Runway.overallContaminant.RunwayContamination.criticalRidge/Ridge.side='LEFT', 'RIGHT' or 'BOTH'


When Runway/RunwayContamination/Ridge.distance is provided, a Ridge.annotation shall be encoded with propertyName='distance', purpose='DESCRIPTION' and note='distance measured from runway centerline'

The AIXM definition of the element is being a distance measured from the edge of the movement area and not from its centreline, therefore an interpretation rule is needed.

ER-12If the assessment is including Taxiway information, TEMPDELTA TimeSlices shall be encoded for each affected Taxiway Feature.
ER-13Snowbanks present on the taxiway shall be encoded as Taxiway/TaxiwayContamination/Ridge.annotation.Note with purpose='WARNINGREMARK' , propertyName='criticalRidge' and note='Snowbanks present on the taxiway'.
ER-14If the assessment is including Apron information, TEMPDELTATimeSlices shall be encoded for each affected Apron Feature.
ER-15

Only the following values shall be used for Runway/.overallContamination.RunwayContamination.frictionDevice:

  • GRT
  • MUM
  • BRD
  • RFT
  • SFH
  • SFL
  • SKH
  • SKL
  • TAP


ER-16

In case the following items are NOT REPORTED - "NR",  xsi:nil=

"true"

'True',  nilReason=

"

'inapplicable

"

' shall be used for the corresponding AIXM element:

  • (runwayCondition) (runwaySectionCondition) contaminant coverage (Runway.areaContaminant.RunwaySectionContamination.proportion)
  • (runwayCondition) (runwaySectionCondition) loose contaminant depth (Runway.areaContaminant.RunwaySectionContamination.depth)
  • (runwayCondition) (runwaySectionCondition) condition description (Runway.areaContaminant.RunwaySectionContamination.layer/SurfaceContaminationLayer.type)
ER-17The AirportHeliport concerned by the surface condition report shall also be coded as concernedAirportHeliport property in the Event.
ER-18The system shall automatically identify the FIR where the AerodromeHeliport is located. This shall be coded as corresponding concernedAirspace property in the Event.

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