The Air Navigation (General) Regulations 1993

includes any estuary or arm of the sea.

means the distance from the point on the surface of the aerodrome at which the aeroplane can commence its take off run to the nearest point in the direction of take off at which the aeroplane cannot roll over the surface of the aerodrome and be brought to rest in an emergency without the risk of accident;

means the distance from the point on the surface of the aerodrome above which the aeroplane can commence its landing, having regard to the obstructions in its approach path, to the nearest point in the direction of landing at which the surface of the aerodrome is incapable of bearing the weight of the aeroplane under normal operating conditions or at which there is an obstacle capable of affecting the safety of the aeroplane;

means the Air Navigation Order 1989;

means either the distance from the point on the surface of the aerodrome at which the aeroplane can commence its take off run to the nearest obstacle in the direction of take off projecting above the surface of the aerodrome and capable of affecting the safety of the aeroplane, or one and one half times the take off run available, whichever is the less;

means the distance from the point on the surface of the aerodrome at which the aeroplane can commence its take off run to the nearest point in the direction of take off at which the surface of the aerodrome is incapable of bearing the weight of the aeroplane under normal operating conditions.