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.
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An aircraft experiencing a loss of two-way radio communications capability can be expected to squawk Code 7600.
A Squawk 7700 indicates an emergency. This can be an emergency of any kind. Pilots may input it into the transponder themselves – or when instructed to do so by ATC. As a result, ground control will know that the aircraft is dealing with a serious issue and needs help.
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.
Code 7700. This is the code for a general emergency. 7700 can be entered into the transponder for a variety of reasons, and some of the most common include medical emergencies, engine failure, problems with pressurization or landing gear, issues with flight control, and more.
The second emergency code is Squawk 7600. This code is used to communicate to air traffic controllers that the aircraft in question has lost communication with the tower. In the case that contact cannot be established, planes will be directed using aviation light signals.
Code 7500 is the code for a hijack of an aircraft. When a pilot enters 7500 in a transponder, they can expect fighter jets to scramble and escort the aircraft to a base.
“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.
This notice assigns Code 1202 for use by gliders not in contact with an air traffic control (ATC) facility. The notice also provides general flight characteristics of gliders and some of their limitations.