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What does RA stand for?

RA stands for Radio Altimeter

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We have 122 other meanings of RA in our Acronym Attic

Samples in periodicals archive:

Radio altimeter readings provide a 'snapshot' height above ground and can give a false impression of clearance margins in regions where terrain rises sharply ahead of the aircraft.
Radio altimeter readings provide a 'snapshot' height above ground and can give a false impression of clearance margins in regions where terrain rises sharply ahead of the aircraft.
Traditional GPWS monitors an aircraft's height above ground as determined by a radio altimeter, and provides an audible warning if an undesirable trend develops.
This AD requires a revision to the Limitation and Normal Procedures Section of the FAA-approved Airplane Flight Manual (AFM) to limit the use of the radio altimeter of the flight management guidance system during the approach phase of flight.