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The TouchDownLiftOff class is used for defining a load bearing area on which a helicopter may touch down or lift-off.
A TLOF may be situated on
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a Runway (of type equal-to 'FATO') or directly at an AirportHeliport
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(i.e.
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the TLOF may form an integral part of the FATO or be situated apart
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).
A TLOF is may be identified by its designator.
The extend of the TLOF may also be described ba the ElevatedSurface class. In addition, its dimension may be described by a lenght length and a width.
It A TLOF may have a centre point. In AIXM 5.1(.1), this is modelled with an aimingPoint that is defined by association with role aimingPoint, using the ElevatedPoint class.
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The aiming point is not the same position as the centre point of a TLOF. According to ICAO Annex 14, Volume II,
The name of the relationship hasAimingPoint and the property TLOF.aimingPoint are not correct, as they were intended to model the centre of the TLOF, not the "aiming point". A change proposal is discussed in the AIXM CCB, see issue AIXM-268 |
The surface material and strengths of a TLOF is encoded modelled by using an association with the SurfaceCharacteristic SurfaceCharacteristics class (see also Surface Characteristic Characteristics [SCH]).