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'''Transponder codes''' are four digit numbers broadcast by the ] in an aircraft in response to a ] interrogation signal to assist air traffic controllers in traffic separation. A transponder code (often called a '''squawk code''') is assigned by air traffic controllers for operation under ] or a ] flight following. Most squawk codes are simply numbers assigned by ATC but there are some that have their own meaning and are used when radio communication is impractical or impossible.


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* 1200: VFR flight, this is the standard squawk code used in North American airspace when no other has been assigned.
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* 7000: VFR standard squawk code for most of European airspace.
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* 0021: VFR squawk code for German airspace (5000 feet and below)
* 0022: VFR squawk code for German airspace (above 5000 feet)

'''Emergency codes'''
If a plane squawks any of these codes, it officially declares an emergency. Warning alarms will go off at nearby ATC centers and ] and the aircraft will be given immediate priority over all other non-emergency traffic.
* 7700: Basic in-flight emergency code. This code will cause alarms to go off at all stations that pick it up and grant immediate attention from air traffic controllers monitoring the area.
* 7600: ]. This code lets controllers know that a radio failure has occurred on the plane. Planes with a radio failure are given priority over other, non-emergency traffic, and ATC will communicate with them via ].
* 7500: Unlawful interference (]) code. A plane squawking this code will be given any assistance requested. If the plane alternates between 7500 and 7700 rapidly, it means a request for immediate, armed intervention in the hijacking. If it is not possible for the pilot to set the transponder, they can also report a hijacking by using the phrase "squawking 7-5-0-0" during radio communications.

* 0000: military escort.

Squawk codes are 4-digit ] numbers, the dials on a transponder read from 0 to 7 inclusive. Thus the lowest possible squawk is 0000 and the highest is 7777. Because the 7000 series squawks are so sensitive in ]n airspace, care must be taken not to squawk 7500, 7600 or 7700 during a squawk code change. For example, when changing from 1200 (normal VFR squawk) to 6501 (an assigned ATC squawk), one might turn the second wheel to a 5, and then rotate the first wheel backwards in the sequence 1-0-7-6 to get to 6. This would momentarily have the transponder squawking 7500, which might lead to more attention than one desires, including a possible interception by a fighter jet.

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Latest revision as of 13:49, 7 June 2017

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