Meaning of terms: regs. 33 to 37

For the purposes of regulations 33 to 37– (a) the take-off run available 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; (b) the take-off distance available 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 twice the take-off run available, whichever is the less; (c) the emergency distance available 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 risk of accident; (d) the landing distance available means the distance from the line of intersection with the surface of the aerodrome of a plane having the following characteristics – (i) it is inclined at a gradient of 1 in 20; 90 Civil Aviation (ii) it clears all obstacles; (iii) it is symmetrical above a vertical plane containing the centre line of the runway or strip intended to be used for landing; (iv) it extends for 1,500 feet from its intersection with the surface of the aerodrome in the direction opposite to the direction of landing of the (v) its width is 400 feet at its intersection with the surface of the aerodrome and increases uniformly to a width of 1,000 feet at its other end, 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