ED-99/DO-272 Definition: A load bearing area on which a helicopter may touchdown or lift-off.
AIXM 5.1.1 Definition: A load bearing area on which a helicopter may touch down or lift-off.

In order to have a complete correspondence the following extensions are needed:

AM: AIXM 5.1.1 extension for AMD

	ED-99/DO-272	A	B	C	D	AIXM 5.1.1	AIRM 1.0.0
	TouchDownLiftOffArea	x	x	x	x	TouchDownLiftOff	urn:aero:airm:1.0.0:LogicalModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:TouchDownLiftOff
1	stfeat			x	x	featureLifetime.gml:TimePeriod.gml:beginPosition	urn:aero:airm:1.0.0:LogicalModel:Abstract:TemporalEnabledEntity@startEntityLifetime
2	endfeat			x	x	featureLifetime.gml:TimePeriod.gml:endPosition	urn:aero:airm:1.0.0:LogicalModel:Abstract:TemporalEnabledEntity@endEntityLifetime
3	stvalid			x	x	validTime.gml:TimePeriod.gml:beginPosition	urn:aero:airm:1.0.0:LogicalModel:Abstract:TemporalEnabledEntity@startValidity
4	endvalid			x	x	validTime.gml:TimePeriod.gml:endPosition	urn:aero:airm:1.0.0:LogicalModel:Abstract:TemporalEnabledEntity@endValidity
5	interp			x	x	interpretation	urn:aero:airm:1.0.0:LogicalModel:Abstract:TemporalEnabledEntity@interpretation
6	feattype	x	x	x	x	Note: Can be implied
7	idnumber		x	x	x	identifier	urn:aero:airm:1.0.0:LogicalModel:Abstract:Entity@identifier
8	idarpt	x	x	x	x	associatedAirportHeliport.AirportHeliport.locationIndicatorICAO	urn:aero:airm:1.0.0:LogicalModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:Aerodrome@locationIndicatorICAO
9	idrwy	x	x	x	x	designator	urn:aero:airm:1.0.0:LogicalModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:TouchDownLiftOff@designator
10	vacc	x	x	x	x	extent.ElevatedSurface.verticalAccuracy	urn:aero:airm:1.0.0:LogicalModel:DataTypes:GeometryTypes:ThreeDimensionalPointType@verticalAccuracy
11	hacc	x	x	x	x	extent.ElevatedSurface.horizontalAccuracy	urn:aero:airm:1.0.0:LogicalModel:DataTypes:GeometryTypes:ThreeDimensionalSurfaceType@horizontalAccuracy
12	vres	x	x	x	x	extent.ElevatedSurface.verticalResolution	urn:aero:airm:1.0.0:LogicalModel:DataTypes:GeometryTypes:ThreeDimensionalCurveType@verticalResolution
13	hres	x	x	x	x	extent.ElevatedSurface.horizontalResolution	urn:aero:airm:1.0.0:LogicalModel:DataTypes:GeometryTypes:ThreeDimensionalPointType@horizontalResolution
14	source	x	x	x	x	source OR gmd:MD_Metadata.gmd:dataQualityInfo.gmd:lineage.gmd:LI_Lineage.gmd:processStep.gmd:LI_ProcessStep Note: Needs processor with a role set to "publisher".	urn:aero:airm:1.0.0:LogicalModel:Abstract:TemporalEnabledEntity@source
15	integr	x	x	x	x	integrity
16	revdate	x	x	x	x	revisionDate OR gmd:MD_Metadata.gmd:identificationInfo.gmd:MD_DataIdentification.gmd:citation.gmd:CI_Citation.gmd:date.gmd:CI_Date.gmd:date Note: also needs gmd:CI_Date.gmd:dateType.gmd:CI_DateTypeCode to be set to "revision"	urn:aero:airm:1.0.0:LogicalModel:Abstract:TemporalEnabledEntity@lastRevision
17	surftype	x	x	x	x	surfaceProperties.SurfaceCharacteristics.composition AND surfaceProperties.SurfaceCharacteristics.preparation	urn:aero:airm:1.0.0:LogicalModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:SurfaceCharacteristics@composition urn:aero:airm:1.0.0:LogicalModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:SurfaceCharacteristics@preparation
18	status			x	x	availability.ManoeuvringAreaAvailability.operationalStatus	urn:aero:airm:1.0.0:LogicalModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:ManoeuvringAreaAvailability@operationalStatus
19	geopoly	x	x	x	x	extent.ElevatedSurface	urn:aero:airm:1.0.0:LogicalModel:Abstract:GeoEnabledEntity@surfaceExtent

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