The basic runway length for an airport is corrected for elevation above MSL, air temperature, and gradient. The correction for elevation (IS standard) is:
Choose the correct answer
5% increase per 300 m above MSL (up to 900 m)
7% increase per 300 m above MSL
10% increase per 300 m above MSL
No correction needed for elevation below 1000 m
Correct Answer
B. 7% increase per 300 m above MSL
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ICAO and IS 2472: Basic runway length correction for elevation = 7% increase per 300 m (1000 ft) above MSL. Higher elevations reduce air density, requiring longer ground runs. Temperature correction = 1% increase per 1 deg C above ISA temperature.
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