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Question

# A runway is being constructed in a new airport as per the international Civil Aviation Organization (ICAO) recommendations. The elevation and the airport reference temperature of the airport are 535 m above the mean sea level and 22.65 oC, respectively. Consider the effective gradient of runway as 1%. The length of the runway required for a design-aircraft under the standard conditions is 2000 m. Within the framework of applying sequential corrections as per the ICAO recommendations, the length of runway corrected for the temperature is

A
2500 m
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B
2750 m
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C
2223 m
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D
2250 m
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Solution

## The correct option is A 2500 mCorrection for elevation; 7% increase per 300 m So, correction =7100×535300×2000=249.66 m Corrected length =2000+249.66=2249.66 m Correction for temperature : Standard atmospheric temperature =15−0.0065×535=11.5225oC Rise of temp,=22.65oC−11.523oC=11.127o Correction =2249.66100×11.127=250.320 m Correct length =2249.66+250.320=2499.98m Check for total correction for elevation plus temperature Total correction %=2299.98−20002000×100=24.99 According to ICAO, this should not exceed by 35%

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