Code 7776 and Code 7777 are reserved for SSR ground transponder monitoring. Are reserved for humanitarian flights.
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Squawking 7700 in an emergencyThe 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.
Setting a squawk of 7700 on the transponder shows that the aircraft is presently dealing with an emergency. The pilot can set it proactively or at air traffic control's request following a 'pan' or 'mayday' call. The squawk code 7700 is a 'catch all' code used for any emergency scenario.
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.
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.
Some squawk codes are reserved, such as 7700 (emergency), 7600 (communication failure), 7500 (hijacking), 1202 (glider), 1200 (VFR), etc. One of these, 7777, is apparently used for military interception. What does this mean in the United States?
“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.
7000. ICAO. VFR standard squawk code when no other code has been assigned. EASA countries. Code that pilot shall set when not receiving air traffic services, unless otherwise prescribed by the competent authority.