CS HPT-DSN.A.020 Definitions

For the purposes of CS-HPT-DSN, the following definitions should apply: ‘D’ means the largest overall dimension of the helicopter when rotor(s) are turning measured from the most forward position of the main rotor tip path plane to the most rearward position of the tail rotor tip path plane or helicopter structure. Note: ‘D’ is sometimes referred to in the text using the term ‘D-value’. ‘Declared distances’ — heliports means: Take-off distance available (TODAH). The length of the FATO plus the length of helicopter clearway (if provided) declared available and suitable for helicopters to complete the take-off. Rejected take-off distance available (RTODAH). The length of the FATO declared available and suitable for helicopters operated in performance class 1 to complete a rejected take-off. Landing distance available (LDAH). The length of the FATO plus any additional area declared available and suitable for helicopters to complete the landing manoeuvre from a defined height. ‘Dynamic load-bearing surface’ means a surface capable of supporting the loads generated by a helicopter conducting an emergency touchdown on it. ‘Final approach and take-off area (FATO)’ means a defined area over which the final phase of the approach manoeuvre to hover or landing is completed and from which the take-off manoeuvre is commenced. Where the FATO is to be used by helicopters operated in performance class 1, the defined area includes the rejected take-off area available. ‘Helicopter air taxiway’ means a defined path on the surface established for the air taxiing of helicopters. ‘Helicopter clearway’ means a defined area on the ground or water, selected and/or prepared as a suitable area over which a helicopter operated in performance class 1 may accelerate and achieve a specific height. ‘Helicopter ground taxiway’ means a ground taxiway intended for the ground movement of wheeled undercarriage helicopters. ‘Helicopter stand’ means an aircraft stand which provides for parking a helicopter and where ground taxi operations are completed or where the helicopter touches down and lifts off for air taxi operations. ‘Helicopter taxi-route’ means a defined path established for the movement of helicopters from one part of a heliport to another. A taxi-route includes a helicopter air or ground taxiway which is centred on the taxi-route. ‘Heliport’ means an aerodrome or a defined area on a structure intended to be used wholly or in part for the arrival, departure and surface movement of helicopters. ‘Heliport elevation’ means the elevation of the highest point of the FATO. ‘Protection area’ means an area within a taxi-route and around a helicopter stand which provides separation from objects, the FATO, other taxi-routes and helicopter stands, for safe manoeuvring of helicopters. ‘Rejected take-off area’ means a defined area on a heliport suitable for helicopters operating in performance class 1 to complete a rejected take-off. ‘Runway-type FATO’ means a FATO having characteristics similar in shape to a runway. ‘Safety area’ means a defined area on a heliport surrounding the FATO which is free of obstacles, other than those required for air navigation purposes, and intended to reduce the risk of damage to helicopters accidentally diverging from the FATO. ‘Static load-bearing surface’ means a surface capable of supporting the mass of a helicopter situated on it. ‘Surface-level heliport’ means a heliport located on the ground or on a structure on the surface of the water. ‘Touchdown and lift-off area (TLOF)’ means an area on which a helicopter may touch down or lift off. Note: The above-mentioned definitions are in addition to those listed in CS-ADR-DSN.