GATE 2017 CE (CE1) – Question 27

Transportation Infrastructure · Airport runway length, taxiway and exit taxiway design · 1 mark · Multiple choice

A new airport has elevation 535 m above mean sea level, reference temperature 22.65°C and effective runway gradient 1%. The design aircraft needs 2000 m runway at standard conditions. Applying sequential ICAO corrections, the runway length after the temperature correction is

2223 m
2250 m
2500 m
2750 m

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Correct answer: (C) 2500 m

Explanation

First correct elevation by 7% per 300 m: $L_e=2000[1+0.07(535/300)]=2249.67$ m. Standard temperature at this elevation is $15-0.0065(535)=11.5225^\circ$C. The excess is $22.65-11.5225=11.1275^\circ$C, giving $L_T=L_e[1+0.01(11.1275)]=2500.00$ m. The question stops at temperature correction; the gradient correction follows later. Select C.

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