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

51 m
30 m
20 m
45 m

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Airport Engineering
Speed of

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

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