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The ILS glide path is normally intercepted between ... from the runway threshold.
  • A
    5 - 10 NM
  • B
    3 - 7 NM
  • C
    4 - 8 NM
  • D
    3 - 10 NM

Refer to figure.

The glidepath of an ILS refers to the ideal line towards the runway. Usually 3 degrees.

The maximum distance at which an ILS Glide Path can be intercepted is 10 NM.
The wavelength of the Ultra High Frequency (UHF) which is used in the ILS Glide Path can not extend further than 10 NM.

The minimum altitude at which you can intercept a standard 3 degrees ILS glide path is 1000 ft.

Using Pythagoras that gives us:

Tan(3) = (1000 ft)/?
? = (1000 ft)/(Tan(3)) = 19081 ft. ≈ 3 NM
The ILS intercepting will be between 3 NM and 10 NM.

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