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radio altimeter
Definição1
A device for measuring the height of the aircraft above the Earth using reflected radio waves.
Fonte1
CROCKER, David. Dictionary of aviation. 2nd ed. London: A&C, 2005.
Fonte2
INTERNATIONAL CIVIL AVIATION ORGANIZATION. Aircraft accident digest n.29. Montreal, 1985. (Cir. 191 AN/116).
Fonte3
INTERNATIONAL CIVIL AVIATION ORGANIZATION. Annex 14 to the Convention on International Civil Aviation: aerodromes: volume 1: aerodrome design and operation. 8th ed. Montreal, 2018. (Annex 14).
Nota adicional1
The radio altimeter works on the principle that, if the path followed by the radio wave is straight down and up, then the elapsed time between the outgoing and incoming signal is a function of the aircraft’s height.
Nota adicional2
Acronym in English: RA.
Contexto
The aircraft's GPWS should have armed as the aircraft climbed through 100 feet above ground level and should have activated if the aircraft began to descend before reaching 700 feet. The GPWS logic altitude signals are provided by the aircraft's radio altimeter.
This is desirable because these aeroplanes are equipped with a radio altimeter for final height and flare guidance, and when the aeroplane is above the terrain immediately prior to the threshold, the radio altimeter will begin to provide information to the automatic pilot for auto-flare.
Português
rádio-altímetro