CS HPT-DSN.C.210 Helicopter air taxiways and helicopter air taxi-routes

(a)General: A helicopter air taxiway should be designed so as to permit the movement of a helicopter above the surface at a height normally associated with ground effect and at ground speed less than 37 km/h (20 kt).

(b)Characteristics:

(1)The width of a helicopter air taxiway should be at least two times the largest width of the undercarriage (UCW) of the helicopters that the helicopter air taxiway is intended to serve (see Figure C-2).

(2)The surface of a helicopter air taxiway should be static load-bearing.

(3)The slopes of the surface of a helicopter air taxiway should not exceed the slope landing limitations of the helicopters the helicopter air taxiway is intended to serve.

(4)The transverse slope of a helicopter air taxiway should not exceed 10 per cent.

(5)The longitudinal slope of a helicopter air taxiway should not exceed 7 per cent.

(6)A helicopter air taxiway should be centred on a helicopter air taxi-route.

(7)A helicopter air taxi-route should extend symmetrically on each side of the centre line for a distance at least equal to the largest overall width of the helicopters it is intended to serve.

(8)No fixed object should be permitted above the surface on an air taxi-route, except for frangible objects, which, because of their function, must be located there.

(9)No mobile object should be permitted on an air taxi-route during helicopter movements.

(10)Objects above ground level whose function requires them to be located on a helicopter air taxi route should not:

(i)be located at a distance of less than 1 m from the edge of the helicopter air taxiway, or at a distance of less than 0.5 times the largest overall width of the helicopter for which the helicopter air taxi-route is designed from the centre line of the helicopter air taxiway, whichever is greater; and

(ii)penetrate a plane originating at a height of 25 cm above the plane of the helicopter air taxiway, and sloping upwards and outwards at a gradient of 5 per cent, at a distance of 1 m from the edge of the helicopter air taxiway, or at a distance of 0.5 times the largest overall width of the helicopter for which the helicopter air taxi-route is designed from the centreline of the helicopter air taxiway, whichever is lower.

(11)The surface of a helicopter air taxi-route should be resistant to the effect of rotor downwash.

(12)The surface of a helicopter air taxi-route should provide ground effect.

(13)For simultaneous operations, the helicopter air taxi-routes should not overlap.

[Figure or form omitted from this preview — available in the Avioverse workspace library.] Figure C-2. Helicopter air taxi-route/taxiway