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
Good to know
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.
