This revision reserves Code 0000 for certain Automatic Dependent Surveillance-Broadcast (ADS-B) units that do not detect and set the ATC-assigned beacon code unless the aircraft is in secondary surveillance radar (SSR) coverage.
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.
Code 7600 is the code for a loss of radio. If a pilot's radio goes out during a fight, they can enter 7600 into the transponder. Then they should proceed to their intended airport following a standard landing plan. Pilots should be extra careful and on alert for other aircraft around them in the sky.
0020. Air Ambulance Helicopter Emergency Medivac. 0021. Fixed-wing aircraft (Receiving service from a ship) 0022.
A squawk of 4000 observed on radar by a controller usually meant that the aircraft operating in Special Use Airspace, exceeding 250 knots below 10,000 feet and/or rapidly maneuvering. It also normally means that they are not talking to an ATC facility.
Emergency codes
The first emergency code that you may have become familiar with is Squawk 7500. This code is used to indicate that the aircraft has been hijacked, and therefore requires urgent emergency support from both security services and air traffic control.
The most well know of these is the code 7700. This is used to indicate an emergency of any kind. A pilot will enter this when in an emergency situation - either instructed by ATC after declaring an emergency or without communication if there is no time.
It also enables air traffic control to quickly render assistance to you in the event of an emergency (squawk 7700), radio failure (squawk 7600) or if you are lost (squawk 0030).
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.
Code 7400 may be displayed 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.
Series 20 — Code 2000 is to recognize an aircraft that has not received instructions from the air traffic control units to operate the transponder.
VFR gliders should squawk 1202 in lieu of 1200. Gliders operate under some flight and maneuvering limitations. They may go from essentially stationary targets while climbing and thermaling to moving targets very quickly.
The first of these is the code 7500, which signals “unlawful interference,” more commonly referred to as hijacking. This is a situation where squawking is particularly useful, as it allows the pilots to contact ATC discreetly.
Three transponder codes are reserved for unusual/emergency situations: - 7700 for general emergencies. - 7600 for loss of communication (radio failure). - 7500 for hijacking or other unlawful interference.
7500 is the squawk code set on a transponder when the airplane is subject to unlawful interference or hijack. Hijacking situations are not all that common; however, they do happen. Yes, even on light aircraft! Air traffic control may completely close the airport to which you are flying.
For example, "1200" in the USA means that the flight is flying under Visual Flight Rules (VFR) and is not typically in direct contact with ATC. "1200" is a shared code so you may see many aircraft transmitting it at the same time in a given area.
2200. VFR - Operating within a controlled aerodrome circuit. 5000-5777. IFR - Domestic (automated by position)
Code 1000 is telling Air Traffic Control that your craft is General Aviation Transport and can be identified by a 24 bit unique label that your transponder will send.
“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.
Code 7776 and Code 7777 are reserved for SSR ground transponder monitoring. Are reserved for humanitarian flights.
What does the phrase "squawk 3456" mean? Set 3456 on the SSR transponder and press the special identification button. Set 3456 on the SSR transponder. Set 3456 on the SSR transponder and press the test button to ensure the functionality of the device. Standby on frequency 345.6Mhz.
If there's a radio failure associated with an emergency, the aircraft might alternately squawk 7600 (no radio) and 7700 (emergency). This alerts ATC that the aircraft is declaring an emergency and does not have an operable radio.
The squawk code 7500 is an emergency code used by pilots to inform ATC of a plane hijacking taking place, which means that the pilots have either been forced to change course or are no longer in control of the aircraft.