According to the ILS coverage area as defined by ICAO Annex 10, the pilot will be guaranteed a reliable signal from the localizer at:

Question

Accepted Answer

20 NM from the threshold on an inbound course and 8  displaced from the localizer centreline.

Answer

27 NM from the threshold on an inbound course and 8  displaced from the localizer centreline.

Answer

10 NM from the threshold on an inbound course and 38  displaced from the localizer centreline.

Answer

19 NM from the threshold on an inbound course and 13  displaced from the localizer centreline.

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