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Under what circumstances is it necessary for a helicopter to be equipped with a radio altimeter?

  • A

    Visibility less than 1500m, out of sight of land or 3 minutes cruising speed from land, and at night.

  • B

    When the aircraft is required to fly below 800m visibility over land or water, day or night.

  • C

    Visibility less than 800m, out of sight of land or 3 minutes cruising speed from land, and at night.

  • D

    Visibility less than 1500m, out of sight of land or 5 minutes cruising speed from land, and at night.

According to the Commission Regulation (EU) No 965/2012 of 5 October 2012, Annex IV related to the Commercial Air Transport Operations [PART-CAT], Subpart D related to “Instruments, Data, Equipment” (IDE), Section 2 for Helicopters, ”CAT.IDE.H.145 Radio altimeters”, is prescribed that:

(a) Helicopters on flights over water shall be equipped with a radio altimeter capable of emitting an audio warning below a pre-set height and a visual warning at a height selectable by the Pilot when operating:

(1) out of sight of the land;

(2) in a visibility of less than 1 500 m;

(3) at night; or

(4) at a distance from land corresponding to more than three minutes at normal cruising speed.

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