Transponder, squawk & codes

Study documents for pilots

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Transponder, squawk & codes

Postby Luca Nicolini » 1 September 2012, 14:22

A transponder (short-for transmitter-responder and sometimes abbreviated to XPDR, XPNDR, TPDR or TP) is an electronic device that produces a response when it receives a radio-frequency interrogation. Aircraft have transponders to assist in identifying them on radar and on other aircraft's collision avoidance systems.
Air traffic control units use the term "squawk" when they are assigning an aircraft a transponder code,e.g., "Squawk 7421".
Squawk or squawking thus can be said to mean "select transponder code" or "I have selected transponder code xxxx".

0021 VFR squawk code for airspace 5000 feet and below — from 15 March 2007 replaced by the international 7000 code for VFR traffic (Germany)
0022 VFR squawk code for airspace (above 5000 feet) — from 15 March 2007 replaced by the international 7000 code for VFR traffic (Germany)
0033 Parachute dropping in progress (UK)
0041 to 0057 Assigned for VFR traffic under Flight Information Services (BXL FIC) (Belgium)
0100 Flights operating at aerodromes (in lieu of codes 1200, 2000 or 3000 when assigned by ATC or noted in the Enroute Supplement Australia) (Australia)
0100 to 0400 Allocated to Service Area Operations for assignment for use by Terminal/CERAP/Industry/Unique Purpose/Experimental Activities (USA)
0100 to 0700 Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2 *Also for use in oceanic airspace, unless another code is assigned by ATC (USA)
0500, 0600, 0700 External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
1000 Instrument Flight Rules (IFR) flight below 18,000' when no other code has been assigned (Canada) Non-discrete mode A code reserved use in Mode S radar/ADS-B environment where the aircraft identification will be used to correlate the flight plan instead of the mode A code (ICAO)
Used exclusively by ADS-B aircraft to inhibit Mode 3A transmit (USA)
Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2 *Also for use in oceanic airspace, unless another code is assigned by ATC (USA)
External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
1100 Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2 *Also for use in oceanic airspace, unless another code is assigned by ATC (USA)
External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
1200 Civil VFR flights in class E or G airspace (Australia )
Visual flight rules (VFR) flight, this is the standard squawk code used in North American airspace when no other has been assigned (Canada and USA)
1201 Visual flight rules (VFR) glider operations for gliders not in contact with ATC, through February 2012 (USA)
Assigned via FAR 93.95 for use by VFR aircraft in the immediate vicinity of LAX (USA)
1202 Visual flight rules (VFR) glider operations for gliders not in contact with ATC; effective February 2012 (USA)
1203 to 1272 Discrete 1200 series codes, unless otherwise allocated (for example, 1255), designated for DVFR aircraft and only assigned by FSS (USA)
1255 Aircraft not in contact with an ATC facility while en route to/from or within the designated fire fighting area(s) (USA)
1273 to 1275 Calibration Performance Monitoring Equipment (CPME) “Parrot” transponders (USA)
1276 Air Defense Identification Zone (ADIZ) penetration when unable to establish communication with ATC or aeronautical facility (USA)
1277 VFR aircraft which fly authorized SAR missions for the USAF or USCG while en route to/from or within the designated search area (USA)
1300 Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2 *Also for use in oceanic airspace, unless another code is assigned by ATC (USA)
External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
1400 VFR flight above 12,500'ASL when no other code has been assigned (Canada)
External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
1500 Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2 *Also for use in oceanic airspace, unless another code is assigned by ATC (USA)
External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
1600, 1700 External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
2000 Civil IFR flights in Class G airspace (Australia)
Uncontrolled IFR at or above 18,000' (Canada)
The code to be squawked when entering a secondary surveillance radar (SSR) area from a non-SSR area used as Uncontrolled IFR flight squawk code(ICAO countries)
Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2 *Also for use in oceanic airspace, unless another code is assigned by ATC (USA)
External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
2100 Ground testing by aircraft maintenance staff (Australia)
Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2 *Also for use in oceanic airspace, unless another code is assigned by ATC (USA)
External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
2200, 2300, 2400 Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2 *Also for use in oceanic airspace, unless another code is assigned by ATC (USA)
External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
2500, 2600, 2700 External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
3000 Civil flights in classes A, C and D airspace, or IFR flights in Class E airspace (Australia)
External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
3100, 3200, 3300, 3400, 3500, 3600, 3700 External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
4000 Civil flights not involved in special operations or SAR, operating in Class G airspace in excess of 15NM offshore (Australia)
Aircraft on a VFR Military Training Route or requiring frequent or rapid changes in altitude (USA)
Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2 *Also for use in oceanic airspace, unless another code is assigned by ATC (USA)
External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
4100 External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
4200, 4300 Internal ARTCC subsets assigned by En Route Safety and Operations Support (Discrete codes only except for first primary block to be used as non-discrete if all discrete codes are assigned) (USA)
4400 to 4477 Reserved for use by SR-71, YF-12, U-2 and B-57, pressure suit flights, and aircraft operations above FL600 (USA)
4401 to 4433 Reserved in accordance with FAA Order JO 7110.67 (Fed Law Enforcement) (USA)
4434 to 4437 Weather reconnaissance, as appropriate (USA)
4440 to 4441 Operations above FL600 for Lockheed/NASA from Moffett Field (USA)
4442 to 4446 Operations above FL600 for Lockheed from Air Force Plant 42 (USA)
4447 to 4452 Operations above FL600 for SR-71/U-2 operations from Edwards AFB (USA)
4453 High balloon operations – National Scientific Balloon Facility, Palestine TX, and other providers, some in international operations (USA)
4454 to 4465 Air Force operations above FL600 as designated in FAA Order 7610.4 (USA)
4466 to 4477 Reserved in accordance with FAA Order JO 7110.67 (Fed Law Enforcement) (USA)
4500, 4600, 4700 Internal ARTCC subsets assigned by En Route Safety and Operations Support (Discrete codes only except for first primary block to be used as non-discrete if all discrete codes are assigned) (USA)
5000 Aircraft flying on military operations (Australia)
5000 Reserved for use by Continental NORAD Region (USA)
5061 to 5062, 5100, 5200 Reserved for special use by Potomac TRACON (USA)
5100, 5200, 5300, 5500 Internal ARTCC subsets assigned by En Route Safety and Operations Support (Discrete codes only except for first primary block to be used as non-discrete if all discrete codes are assigned) (USA)
5100 to 5300 May be used by DOD aircraft beyond radar coverage but inside US controlled airspace with coordination as appropriate with applicable Area Operations Directorate (USA)
5400 Reserved for use by Continental NORAD Region (USA)
5600, 5700 External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
6000 Military flights in Class G airspace (Australia)
External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
6100 Reserved for use by Continental NORAD Region (USA)
6200, 6300 External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
6400 Reserved for use by Continental NORAD Region (USA)
6500, 6600, 6700 External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
7000 VFR standard squawk code when no other code has been assigned (ICAO)
This code does not imply VFR; 7000 is used as a general conspicuity squawk (UK)
External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
7001 Used in some countries to identify VFR traffic (France)
Sudden military climb out from low-level operations (UK)
7004 Aerobatic and display code in some countries (UK)
7010 VFR circuit traffic code in the UK
7070 to 079 Paradrop activities (France)
7100, 7200, 7300, 7400 External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
7500 Aircraft hijacking (ICAO, worldwide)
7501 to 7577 Reserved for use by Continental NORAD Region (CONR) (USA)
7601 to 7607 Reserved for special use by FAA (USA)
7610 to 7676 External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
7600 Radio Failure (Lost Communications) (ICAO, worldwide)
7615 Civil flights engaged in littoral surveillance (Australia)
7700 Emergency (ICAO, worldwide)
7701 to 7707 Reserved for special use by FAA (USA)
7710 to 7776 External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC’s non-discrete code if all discrete codes are assigned) (USA)
7777 Non-discrete code used by fixed test transponders (RABMs) to check correctness of radar stations (BITE) (Belgium, Germany, Netherlands, USA)
DOD interceptor aircraft on active air defense missions and operating without ATC clearance in accordance with FAA Order 7610.4 (USA)
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