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Following a take-off, limited by the 50 ft screen height, a light twin climbs on a gradient of 5%. It will clear a 160 m obstacle in relation to the runway (horizontally), situated at 5 000 m from the 50 ft point with an obstacle clearance margin of:

  • A

    90 m

  • B

    it will not clear the obstacle

  • C

    75 m

  • D

    105 m

Refer to figure.
Gradient = (Change in Height / Distance Travelled) x 100
Change in Height = (Gradient x Distance Travelled) / 100
Change in Height = (5 x 5 000) / 100
Change in Height = 250 m

Start height is 50ft or 15m, therefore aircraft's height = 250 m + 15 m = 265 m
It will then clear the obstacle by 265 m - 160 m = 105 m

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