Airport Engineering
In approach areas of runways equipped with instrumental landing facilities any object within 4.5 km distance from runway end shall be considered as an obstruction if its height is more than

20 m
30 m
51 m
45 m

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Airport Engineering
Wing loading of an aircraft is

Load of the wings
Gross total weight of the aircraft/total available H.P of engines
Gross total weight of the aircraft/ load of the wings
Gross total weight of the aircraft/ wing area

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Airport Engineering
Castor angle is defined as the angle

Between the horizontal and the fuselage axis
Formed by the longitudinal axis of the aircraft and the direction of movement of the nose gear
Between the direction of wind and the longitudinal axis of the runway
Between the true speed of the aircraft and the crosswind component

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