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Given the following information, at what approximate distance from threshold can you expect to capture the GP?

Aircraft height: 2500 ft
ILS GP angle: 3°

  • A
    7.0 NM
  • B
    14.5 NM
  • C
    8.2 NM
  • D
    13.1 NM

The exercise provides an angular value that can be converted in a gradient:

Gradient = 100 / 60 x 3 = 5 %

Climb gradient = ( Change in Height / Horizontal distance ) x 100%

Horizontal distance = 2500 / (6080 x 5) x 100 = 8,2 NM

NOTE: Altitude and horizontal distance must be in the same unit of measurement, 1NM = 6080 ft approximately.

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