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Indicator Height

Technical Information

Catalogue No: C0177
Category: Radio Communication/Sensing
Object Type: Indicator/Instrument
Object Name: Indicator Height
Part No: 81-22-07
Serial No: xxx/66
Manufacturer: Elliott
Division: Instrument Systems [ISD]
Platform(s): Buccaneer
Year of Manufacture: circa 1966
Dimensions: Width (mm): 83
Height (mm): 83
Depth (mm): 80
Weight (g): 400
Location: Triple Shelf Unit, RH (indicators) [Main Store]

STC No.: RL-7003-225
NSN: 5826-99-954-2800
Compass safe distance: 3.2 Inches


A radar altimeter, electronic altimeter, reflection altimeter, radio altimeter (RADALT), low range radio altimeter (LRRA) or simply RA, used on aircraft, measures altitude above the terrain presently beneath an aircraft or spacecraft 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.
This unit is missing its rear module and has no identification marks. However we much appreciate that these details have now been sent in from Robert Herring a collector who has another identical Height Indicator (June 2023). The Part No. and inscriptions cannot be verified but are likely to be similar.
The unit is a Mk27 Altimeter Pt No 6A8977

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