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The following list shows specific aeronautical transponder codes, and ranges of codes, that have been used for specific purposes in various countries. Traditionally, each country has allocated transponder codes by their own scheme with little commonality across borders. The list is retained for historic interest.
Identification, friend or foe ( IFF) is a combat identification system designed for command and control. It uses a transponder that listens for an interrogation signal and then sends a response that identifies the broadcaster. IFF systems usually use radar frequencies, but other electromagnetic frequencies, radio or infrared, may be used. [1]
The U.S. Navy introduced the identification system of tail and wing letter codes for its aircraft in July 1945. This system was intended to replace the set of geometrical symbols employed for the similar purpose since January 1945. When introduced, tail codes were only given to aircraft carriers.
A traffic alert and collision avoidance system ( TCAS, pronounced / tiːkæs /; TEE-kas ), is an aircraft collision avoidance system designed to reduce the incidence of mid-air collision (MAC) between aircraft. It monitors the airspace around an aircraft for other aircraft equipped with a corresponding active transponder, independent of air ...
A transponder (short for trans mitter-res ponder [1] and sometimes abbreviated to XPDR, [2] XPNDR, [3] TPDR [4] or TP [5]) is an electronic device that produces a response when it receives a radio-frequency interrogation. Aircraft have transponders to assist in identifying them on air traffic control radar. Collision avoidance systems have been ...
Air management system AMSL Above mean sea level: AMP Aircraft maintenance program AMT Aircraft Maintenance Technician: ANC Active noise cancellation AND Aircraft Nose Down ANN Annunciator panel: Caution warning system normally containing visual and audio alerts to the pilot ANPT Aeronautical national pipe taper ANR Active noise reduction ANSP 1
In many cases, the 1977 plates are worn and illegible; legally per M.G.L. Chapter 90, a car with an illegible plate (regardless of age or color) must fail the state's annually required vehicle safety inspection. This is a safety fail, which under Massachusetts law prohibits operation of the vehicle until the issue is corrected.
ACARS as a term refers to the complete air and ground system, consisting of equipment on board, equipment on the ground, and a service provider. On-board ACARS equipment [4] consists of end systems with a router, which routes messages through the air-ground subnetwork. Ground equipment is made up of a network of radio transceivers managed by a ...