Transponder code: Difference between revisions

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	'''Transponder codes''' are four digit numbers transmitted 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 ] but there are some that have their own meaning and are used when radio communication is impractical or impossible.

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	==Routine codes==
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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 European airspace.
	* 7004: Aerobatic and display code.
	* 0021: VFR squawk code for German airspace (5000 feet and below)
	* 0022: VFR squawk code for German airspace (above 5000 feet)
	* 0001: Military code for highspeed uncontrolled (non-ATC directed) flight (US)
	* 7001: Sudden military climbout from low-level operations (UK)
	* 2000: The code to be squawked when entering an SSR area from a non-SSR area (used as a VFR squawk code in some European countries)
	* 0000: military escort (in the US), suspected transponder failure (in the UK).

	==Emergency codes==
	classified for safety reasons

	==Other aspects==
	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 these squawks are sensitive, care must be taken not to squawk 7500, 7600 or 7700 during a squawk code change. For example, when changing from 1200 to 6501, 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. Modern digital transponders are operated by buttons and avoid this problem.

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Latest revision as of 13:49, 7 June 2017

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Transponder (aeronautics)#Transponder codes

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