Definition

The surface condition report event scenario describes information about contaminations on one or multiple runways, taxiways and/or aprons at one airport.

Notes:

The objective of this scenario is to support the encoding of contamination information about individual runways, taxiways or aprons, as foreseen to be contained in SNOWTAM messages as of 04 November 2021 (ICAO) or 12 August 2021 (EU);
Several runways, taxiways and aprons can be included in the surface condition report;
The content of the report is considered as described in ICAO Doc 10066 - Aeronautical Information Management, First Edition, Amendment No. 2, 2018, Appendix 4 - SNOWTAM Format and CIR (EU) 2017/373 as amended by CIR (EU) 2020/469 and CIR (EU) 2020/1177 - Appendix 3 SNOWTAM Format.
This scenario does not support the encoding of the information about airport, runway closure due to contamination. That information should be encoded using the dedicated AD.CLS or RWY.CLS scenarios.

Event data

The following diagram identifies the information items that are usually provided by a data originator for this kind of event.

EBNF Code

input = "airport designator" ["airport name"] "runwayCondition" {"runwayCondition"} \n
["taxiway condition" {"taxiway condition"}| "all taxiway poor"] ["apron condition" {"apron condition"}| "all apron poor"] \n
["note"].

runwayCondition = "assessment date and time" "runway designator" "runwaySectionCondition" {"runwaySectionCondition"}  \n
["reduced runway width"] ["reduced runway length"] ["special conditions"] ["friction measuring device"] \n
["snow bank side" "snow bank distance" {"snow bank side" "snow bank distance"}] ["adjacent snow bank presence"].

runwaySectionCondition = "runway section" "RWYCC on runway section" ["measured friction coefficient"] \n ["contaminant coverage"] ["loose contaminant depth"] ["contaminant layer order"] "condition description" {["contaminant layer order"] "condition description"}.

taxiwayCondition = "taxiway designator" ["taxiway surface condition"] ["taxiway snow bank presence"].

apronCondition = "apron designator" "apron surface condition".

Data item	Description	AIXM Mapping	ICAO SNOWTAM item mapping
Aeroplane performance calculation section
airport designator	The published designator of the airport/heliport concerned. This information, in combination with eventually the name is used to identify the airport/heliport.	AirportHeliport.designator	Item A) Aerodrome location indicator
airport name	The published name of the airport/heliport. This information, in combination with the designator is used to identify the airport/heliport.	AirportHeliport.name	-
(runwayCondition) assessment date and time	The date and time of the assessment.	Runway.overallContaminant.RunwayContamination.observationTime	Item B) Date-time of assessment
(runwayCondition) runway designator	The designator of the runway for which the assessment is provided. Note: In a SNOWTAM message only the runway direction designator with the lowest number is inserted for each runway. The HMI should support the operator in assuring the proper selection of the runway by displaying the full designator for selection.	Runway.designator	Item C) Lower runway designator number
(runwayCondition) (runwaySectionCondition) runway section	Indicates the part of the runway for which the assessment is provided. This supports indicating contamination information on each third of the runway length. Note: the data input template groups the information per runway third. In practice, data originator might prefer to group the information by SNOWTAM item and list all thirds with a "/" separator. The application HMI shall support the operator selection with visual or textual aids so that the order of the thirds are correctly provided i.e. that the first third corresponds with the first third from the RWY side with the lower designator number.	Runway.areaContaminant.RunwaySectionContamination.section
(runwayCondition) (runwaySectionCondition) RWYCC on runway section	Runway condition code for each runway third.	Runway.areaContaminant.RunwaySectionContamination.frictionEstimation with values 'OTHER:RWYCC_code'	Item D) Runway Condition Code (RWYCC) on each runway third
(runwayCondition) (runwaySectionCondition) contaminant coverage	The coverage of the contaminant in per cent for each runway third.	Runway.areaContaminant.RunwaySectionContamination.proportion	Item E) Per cent coverage contaminant for each runway third
(runwayCondition) (runwaySectionCondition) loose contaminant depth	Indicates the depth (mm) of loose contaminant for each runway third	Runway.areaContaminant.RunwaySectionContamination.depth with uom='MM'	Item F) Depth (mm) of loose contaminant for each runway third
(runwayCondition) (runwaySectionCondition) contaminant layer order	Indicates the order of the layer (starting from the uppermost, towards the movement area surface), in case overlapping contaminants are present.	Runway.areaContaminant.RunwaySectionContamination.layer/SurfaceContaminationLayer.layerOrder
(runwayCondition) (runwaySectionCondition) condition description	Indicated the contaminant observed on each runway third.	Runway.areaContaminant.RunwaySectionContamination.layer/SurfaceContaminationLayer.type	Item G) Condition description over total runway length.
(runwayCondition) reduced runway width	Width of runway cleared of contamination, if less than the total width.	Runway.overallContaminant.RunwayContamination.clearedWidth with uom="M"	Item H) Width of runway to which the runway condition codes apply, if less than published width
Situational awareness section
(runwayCondition) reduced runway length	Length of runway cleared of contamination, if less than the total length of the runway.	Runway.overallContaminant.RunwayContamination.clearedLength with uom='M'	Item I) Reduced runway length, if less than published length
(runwayCondition) special conditions	Indication of the presence of drifting snow, loose sand and/or chemical treatment on the runway. Note: The HMI should support the operator by providing only the three options available for input.	AirportHeliport.contaminant.AirportHeliportContamination.layer.SurfaceContaminationLayer.type (for larger airports, where drifting snow occurs on multiple runways, but not all) Runway.overallContaminant.RunwayContamination.layer.SurfaceContaminationLayer.type	Item J) Drifting snow on the runway
(runwayCondition) special conditions		Runway.overallContaminant.RunwayContamination.layer.SurfaceContaminationLayer.type	Item K) Loose sand on the runway Item L) Chemical treatment on the runway
(runwayCondition) snowbank side	Indication of the side of the runway relative to its centreline where snowbanks are present.	Runway.overallContaminant.RunwayContamination.criticalRidge/Ridge.side	Item M) Snowbanks on the runway (from centreline)
(runwayCondition) snowbank distance	Indication of the distance from the runway centreline where snowbanks are present.	Runway.overallContaminant.RunwayContamination.criticalRidge.Ridge.distance with uom="M" and Ridge.annotation with propertyName='distance', purpose='DESCRIPTION' and note='distance measured from runway centerline'	Item M) Snowbanks on the runway (from centreline)
(runwayCondition) adjacent snowbank presence	Indication of the presence of snowbanks adjacent to the runway	Runway.overallContaminant.RunwayContamination.annotation.Note with purpose='REMARK' , propertyName='criticalRidge' and note='Snowbanks present adjacent to the runway'	Item O) Snowbanks adjacent to the runway
(taxiwayCondition) taxiway designator	The designator of the taxiway for which the assessment is provided.	Taxiway.designator	Item N) Snowbanks on a taxiway
(taxiwayCondition) taxiway snowbank presence	Indication of the presence of snowbanks on a taxiway	Taxiway.contaminant/TaxiwayContamination.annotation.Note with purpose='REMARK' , propertyName='criticalRidge' and note='Snowbanks present on the taxiway'	Item N) Snowbanks on a taxiway
(taxiwayCondition) taxiway surface condition	Indication of the taxiway surface condition	Taxiway.contaminant.TaxiwayContamination.frictionEstimation	Item P) Taxiway conditions
all taxiway poor	Indication that all TWY at the airport are in poor condition	AirportHeliport.contaminant.AirportHeliportContamination.annotation.Note with purpose='REMARK' and note='All TWYs poor'	Item P) Taxiway conditions
(apronCondition) apron designator	The designator of the apron for which the assessment is provided.	Apron.name	Item R) Apron conditions
(apronCondition) apron surface condition	Indication of the apron surface condition	Apron.contaminant.ApronContamination.frictionEstimation
all apron poor	Indication that all apron at the airport are in poor condition	AirportHeliport.contaminant.AirportHeliportContamination.annotation.Note with purpose='REMARK' and note='All aprons poor'
(runwayCondition) (runwaySectionCondition) measured friction coefficient	Indication of the measured friction coefficient, according to the State approved means.	Runway.areaContaminant.RunwaySectionContamination.frictionCoefficient	Item S) Measured friction coefficient
(runwayCondition) friction measuring device	Indication of the friction measuring device, according to the State approved means.	Runway.overallContaminant.RunwayContamination.frictionDevice	Item S) Measured friction coefficient
note	A free text note that provides further details concerning the surface condition report.	AirportHeliport.contaminant.AirportHeliportContamination.annotation.Note with purpose='REMARK'	Item T) Plain language remarks

Assumptions for baseline data

It is assumed that following BASELINE TimeSlices covering the entire duration of the event exist and have been coded as specified in the Coding Guidelines for the (ICAO) AIP Data Set:

AirportHeliport BASELINE as specified in the Basic Data for Airport/Heliport,
Runway BASELINE according to the coding rules for Basic Data for Runway;

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

(1) using TEMPDELTA TimeSlices for individual Apron and/or Taxiway

(2) using annotations

The first option can be used only when the corresponding BASELINE data is also available:

Taxiway BASELINE which contains as a minimum a designator and an association with the AirportHeliport;
Apron BASELINE which contains as a minimum a designator and an association with the AirportHeliport;

Both options are detailed in the coding rules and should be supported in the interface. Option 2 (using annotations) should be enable, at the discretion of the data coding operator, even in the situation when Taxiway and Apron BASELINE data is available.

Data encoding rules

The data encoding rules provided in this section shall be followed in order to ensure the harmonisation of the digital encodings provided by different sources. To the maximum possible extent, the compliance with these encoding rules shall be verified with automatic data validation rules.

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, 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.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-10	snowbanks adjacent to the runway shall be encoded as Runway.overallContamination.RunwayContamination.annotation.Note with purpose='REMARK' , propertyName='criticalRidge' 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-12	If the assessment is including Taxiway information, TEMPDELTA TimeSlices shall be encoded for each affected Taxiway Feature.
ER-13	Snowbanks present on the taxiway shall be encoded as Taxiway/TaxiwayContamination.annotation.Note with purpose='REMARK' , propertyName='criticalRidge' and note='Snowbanks present on the taxiway'.
ER-14	If the assessment is including Apron information, TEMPDELTA TimeSlices 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', 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-17	The AirportHeliport concerned by the surface condition report shall also be coded as concernedAirportHeliport property in the Event.
ER-18	The system shall automatically identify the FIR where the AerodromeHeliport is located. This shall be coded as corresponding concernedAirspace property in the Event.

Examples

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