What is the significance of “Squawking 7700” and when is 7700 needed? Declaring an emergency means the crew determines they have an “urgency” or “distress” situation.
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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?
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.
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.
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)
These emergency squawk codes are established as a worldwide standard by ICAO: 7500 - Aircraft hijacking. 7600 - Radio failure/lost communications. 7700 - General emergency - This indicates any other kind of emergency, for example, an onboard medical emergency or a mechanical problem.
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.
Transponder codesThis allows easy identification of aircraft on radar. Codes are made of four octal digits; the dials on a transponder read from zero to seven, inclusive. Four octal digits can represent up to 4096 different codes, which is why such transponders are sometimes described as 4096 code transponders.
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.