What is code 0000 in aviation?

0000 — A generic code that is not assigned and should not be used. 1200 — VFR aircraft. The default code for all flights–if you aren't asked to set anything else, you should set 1200. 7500 — Hijacking. 7600 — Voice radio failure.



In aviation, code 0000 is a specific transponder squawk code that is generally reserved for technical use or as a non-discrete code that should never be assigned to an aircraft for flight. In the United States and many other regions, it is a code that identifies a transponder as being "on" but not yet set to a valid operational code. Pilots are often instructed never to squawk 0000 while in the air because it can interfere with certain Air Traffic Control (ATC) automation systems or be filtered out by radar as a non-legitimate target. Some pilots use 0000 as a "place-holder" on the ground to remind themselves to input their actual IFR (Instrument Flight Rules) clearance code before takeoff. However, in some modern ADS-B systems, 0000 may be used by the hardware to signify a state of non-communication or a default power-up mode. Because it is a "forbidden" code for standard navigation, squawking it accidentally in flight may cause ATC to request an immediate reset to a standard VFR (1200 or 7000) or assigned code to ensure the aircraft is properly tracked.

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Military aircraft operating in restricted/warning areas or on VR routes will squawk 4000 unless another code has been assigned or coordinated with ATC.

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1000: Mode A transponder code that is reserved for use in Mode S radar/ADS-B setups where aircraft identification is used to correlate flight plan. 2000: Uncontrolled IFR transponder code used when entering a secondary surveillance radar (SSR) area from a non-SSR area.

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By international agreement, 2000 is used for aircraft which have not been assigned a transponder code, although in some parts of Europe, 7000 is used for this purpose.

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Squawk codes are what air traffic control (ATC) use to identify aircraft when they are flying. They are unique four-digit numbers and range from 0000 to 7777; some of which are fixed values signifying specific scenarios (see below), others being randomly generated by ATC.

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Squawk 7000: This is the 'conspicuity code' for VFR aircraft that are not assigned a specific code by ATC. Squawk 2000: This is the 'conspicuity code' for IFR aircraft that are not assigned a specific code by ATC.

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If you are flying under visual flight rules in uncontrolled U.S. or Canadian airspace, you will use squawk code 1200. You may also hear this referred to as “squawk VFR.” If you're in a controlled airspace, the controller will assign you a unique four-digit squawk code.

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As of 2009, the Cospas-Sarsat system terminated monitoring and reception of the 121.5 MHz and 243.0 MHz frequencies.

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“Squawk 1234” means to just dial 1234 into your transponder. The ATC radar will show the controller that number in the tag associated with your plane. If the tell you, “squawk 1244 and ident”, you should put in the code first, and then press and release the Ident (or ID) button on the transponder.

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1) Exemption 3585 allows the Flight Follower to release a flight to an airport or alternate when the TAF indicates, through the conditional statements (TEMPO, PROB, BECMG) that the weather could be below authorized landing minimums at the estimated time of arrival.

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Code 7400 may be transmitted by unmanned aircraft systems (UAS) when the control link between the aircraft and the pilot is lost. Lost link procedures are programmed into the flight management system and associated with the flight plan being flown.

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For code, F ICAO to be 155 meters specifies aircraft the width of the lower surface. The justification used is that not only the wingspan is 20 meters larger (on initial code E 60 meters) but also the runway width is 15 meters larger (60 meters code E).

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Squawking 7700 in an emergency Reserved codes are used in particular situations when an aircraft wants to communicate something to ATC urgently. The most well know of these is the code 7700. This is used to indicate an emergency of any kind.

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