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

30 m
20 m
51 m
45 m

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Airport Engineering
Castor angle is defined as the angle

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

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