MIG21 Radio Altimeter Antenna Mounting

Non-Certified Sample
Item for product evaluation purposes only
Superform Metals Ltd.

A radar altimeter, or radio altimeter (RADALT), used on aircraft, measures altitude above the terrain presently beneath an aircraft by timing how long it takes a beam of radio waves to reflect from the ground and return to the plane. This type of altimeter provides the distance between the antenna and the ground directly below it, in contrast to a barometric altimeter which provides the distance above a defined datum, usually mean sea level. Radar altimeters are used in military aircraft to fly quite low over the land and the sea to avoid radar detection and targeting by anti-aircraft guns or surface-to-air missiles.
The antenna housing will be a flush fitting item usually marked with a ‘Do not paint’ legend.