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
45 m
51 m

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Airport Engineering
Speed of

Sound at 0°C is 1190 kmph
Sound varies 2.4 kmph per degree centigrade rise in temperature
All listed here
Sound at 0°C is called one Mach

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Airport Engineering
Castor angle is defined as the angle

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

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