For TLOF PANS-AIM requires some basic properties as part of the minimum AIP data set. These are
designator, centre point, length, width, surface type
The diagram below shows the AIXM classes, including the relevant data types, needed to encode that information:
TLOF designator
TLOF Centre Point (aimingPoint)
ICAO Annex 14, Volume II,
An aiming point marking should be provided at a heliport where it is necessary for a pilot to make an approach to a particular point before proceeding to the TLOF.
The aiming point marking shall be located within the FATO.
Where the TLOF is set apart from the FATO, it may be necessary for a pilot to make an approach to a particular point on the FATO before proceeding to the TLOF. In this case a white triangular Aiming Point Marker, as described in ICAO Annex 14, Volume II, Section 5.2.6 may be used.
TLOF Dimension (lenght & width)
Surface
The surface specification of a runway is related to the complete runway as a physical element and not related to the different runway directions.
The SurfaceCharacteristic class groups together the attributes that model characteristics of an airport surface, such as strength, material, etc.
For detailed information about the surface characteristic attributes & corresponding rules please refer to topic Surface Characteristic [SCH].
Coding Rules for Basic Data for Runway
Coding Examples
TBD in the scope of the DONLON AIXM AIP dat set.