Instrument used in aircraft that measures altitude, or height above sea level is


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asked Dec 6, 2011 in Geography Questions by anonymous
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Radar altimeters are frequently used by commercial aircraft for approach and landing, especially in low-visibility conditions (see instrument flight rules) and also automatic landings (autoland), allowing the autopilot to know when to begin the flare maneuver.

In civil aviation applications, radio altimeters generally only give readings up to 2,500 feet (760 m) above ground level (AGL).

answered Dec 9, 2011 by jeet sagar Moderator (1,034,200 points)

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