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Revision as of 02:15, 12 August 2006 edit68.205.105.139 (talk) →Emergency codes← Previous edit Latest revision as of 13:49, 7 June 2017 edit undoTom.Reding (talk | contribs)Autopatrolled, Extended confirmed users, Page movers, Template editors3,820,737 editsm +{{Redirect category shell}} using AWB 
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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==
* 7700: Emergency
* 7600: Lost Communications
* 7500: Hi-jack
* 7777: Military Interception

==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 any emergency code during a squawk code change. For example, when changing from 1200 to 6501, one might turn the second wheel to a 5 (thus ''1500''), 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 a hi-jack code (''7500''), which might lead to more attention than one desires. 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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