equipment, on board an aircraft or spacecraft, used to determine the height of the aircraft or the spacecraft above the ground, by emission and reception of radio waves
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The term “ground” means usually the solid or liquid surface of the Earth or the surface of another celestial body.
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Valdkond ICAO lisade põhjal loodud klassifikaatori järgi: Lennutegevus
The helicopter shall be equipped with a radio altimeter capable of emitting an audio warning below a pre-set height and an audio and visual warning at a height selectable by the pilot, instantly discernable during all phases of NVIS flight.
