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Question

The length of runway under standard conditions is 2000 m. The elevation of airport site is 300 m. Its reference temperature is 33.05oC. If the runway is to be constructed with an effective gradient of 0.25%, the corrected runway length will be _______m.
  1. 2696.4

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Solution

The correct option is A 2696.4
For standard conditons,

Length of runway = 2000 m

Correction for elevation =7100×2000×300300
= 140 m

Corrected length of runway = 2000 + 140 = 2140 m
Standard atmospheric temperature at given elevation = 15 - 0.0065 × 300
= 13.05oC
Correction for temperature =2140100×(33.0513.05)=428 m
Corrected length of runway = 2140+428=2568 m

Correction for gradient =20100×2568×0.25=128.4m

Corrected length of runway = 2568 + 128.4 m

= 2696.4 m

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