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.
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Squawking 7700 in an emergencyReserved 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.
There are a few significant squawk codes, which immediately get the attention of air traffic control. For a longer discussion of squawk codes and emergencies, please see our discussion with a pilot and an air traffic controller. 7500: Hijack. 7600: Radio Failure. 7700: General Emergency.
Squawk codes are assigned to a flight before departure, with the most well known one being code 7700. This is used to indicate an emergency of any kind, from engine failure, to technical problems and urgent medical emergencies.
During those days, the word liftoff was used. In more recent books, rotation became the standard term, essentially replacing liftoff. The terminology used by pilots is consistent, and it is explicitly chosen so that it will not cause any possible confusion with any other term used in the industry.
Red: When an aircraft is displayed as red that means that you are currently following that specific aircraft on the map or that the aircraft's transponder is squawking an emergency code. These codes are 7500 (Hijack), 7600 (Communication Equipment Failure), 7700 (General Emergency)
If a crew resets their transponder to the emergency code of 7700 (squawking 7700), all air traffic control facilities in the area are immediately alerted that the aircraft has an emergency situation.
Whether flying at night or during the day, pilots need to see some kind of horizon. They use this to determine the airplane's attitude. At night pilots will turn their gaze from outside to inside and use the artificial horizon. The artificial horizon is normally a simply globe split into two hemispheres.
The number of “souls” on an aircraft refers to the total living bodies on the plane: every passenger, pilot, flight attendant and crew member, according to Lord-Jones. Pilots often report the number of “souls” when declaring an emergency, she says, so rescuers know the amount of people to search for.
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.