7700 Plane Code
Felicity
Squawk codes are four-digit codes that are used for communication between the aircraft during flight and the air traffic control (ATC) personnel. The code consists of four digits between 0 and 7. Unique codes allow pilots and controllers to establish efficient communication during various situations related to aircraft safety, the environment, and others. Squawk codes can be changed mid-flight depending on the circumstances.
A Squawk 7700 code indicates an emergency onboard the aircraft. It may be due to technical, environmental, or medical issues that results in an emergency situation. The Squawk 7700 can either be instructed by the ATC or can be inputinto the transponders by pilots.
With the emergency code activated, all controllers (including ground controllers) are aware that the aircraft is dealing with an emergency situation. Ground controllers can alert emergency crew and keep the staff on standby before the arrival of the aircraft.
Squawk codes are used to provide effective communication between air traffic control and aircraft. A squawk code is a four-digit number assigned to each aircraft that aids in identification. This will show up on the controller's screens, along with vital flight information such as altitude and speed.
Pilots enter the squawk code into the aircraft transponder. This then communicates with ground equipment to display the aircraft information. Usually, an aircraft will keep the same code for the duration of a flight, but it may be changed by other airports or in a particular airspace.
If you are wondering where the term "squawk" comes from, it originates from the Second World War. At that time, basic systems were developed for an aircraft to identify itself to ground controllers - essentially to let them know if the aircraft was friendly or an enemy aircraft. This became known as the "Parrot" system, with the term "squawk" used to refer to the communication between them.
Squawk codes are assigned to a flight before departure. The four digits can be between zero and seven - giving 4,096 possible combinations. 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. 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. This will clearly inform all tracking ground controllers that the aircraft has a serious issue onboard and should be given appropriate assistance.
This could include any 'Mayday' situation, such as engine failure, pressurization problems, other technical problems, or urgent medical emergencies. Squawking 7700 will allow ATC to prepare for a quick landing, allowing controllers to inform nearby aircraft and clear any runways needed, as well as inform the authorities of any other support necessary (such as fire services or an ambulance). Having such a code available is very useful. It not only advises ground operators clearly of the problem, but it also provides a quick way for pilots to communicate.
Every emergency is different, and there may not be much time for discussion. Pilots are trained in an emergency to "Aviate, Navigate, Communicate" - in that order. Making sure the aircraft is flying correctly is the top priority. Of course, communication (including with ATC and internally) is an important but lower priority in an emergency. Having a fast and clear transponder option can be useful.
While 7700 may be the special squawk code we most often hear about, there are others. They serve the same purpose - to provide easy notification to anyone monitoring the aircraft of the situation. These are all (including 7700) defined by the International Civil Aviation Organization (ICAO).
There are two other emergency squawk codes. Code 7500 is used to indicate a hijack, and 7600 to notify that the aircraft has lost communication with ATC. Both of these are, of course, very useful in a situation where radio contact cannot be maintained. ATC will still be able to provide the required services and priority assistance. In the event of lost communication, light signal backups can be used as well. Code 7500 may also allow pilots to swiftly inform ATC of a hijacking without notifying the hijackers onboard or as soon as they are aware of such a situation.
Codes are not just used for emergencies. There are many other reserved codes assigned by ICAO. These include codes for military operations, search and rescue, and intercept flights. There are also codes for specific flights such as glider operations and parachute dropping.
Squawking 7700 is not rare since pilots choose to do so for any emergency that requires swift assistance. In late December, a British Airways Airbus A320 returned to London Heathrow due to technical issues, with passengers reporting a burning smell in the cabin. The landing was precautionary and all safely returned to the origin airport.
In November, an American Airlines Boeing 787-9 diverted to Glasgow while flying from Frankfurt to Dallas-Fort Worth. Once again, passengers noted a strong burning odor from the cabin, and the pilot requested an immediate landing at the closest airport, which was Glasgow. This time, the aircraft stopped on the runway first before being towed to the gate. Once more, no passengers were injured and the flight landed safely.
Squawk codes are part of a well-defined universal set of ATC rules. They have been in existence for a long time, with few changes. Feel free to discuss any of these further in the comments.
I've read about possible reasons for 7700 squawks and they seem to be manifold. Isn't the purpose of an emergency call to be used only in really critical scenarios? How is an aircraft going down to be differentiated from one carrying a sick passenger? Are there any plans in the industry to change the current system?
7700 is a "general emergency" squawk. It tells ATC that there is "a problem" of some sort with a particular plane. And I agree that this "general umbrella" type of squawk is a good idea. I have several disagreements with the FAA, but this is a good one. Several thoughts:
Why did you think that? 7700 is not some "we're gonna die" type of squawk. It's a general "umbrella type" of squawk for all sorts of emergencies. An intelligent pilot will squawk 7700 for any "small" or "big" type of emergency (and who is supposed to be the judge on "big" vs. "small"?).
It isn't, because it doesn't matter. The people that are familiar with the situation (PIC and ATC) are in communication, unless lost comm, in which case the controller who can't glean more info from the 7700 squawk can't help anyway, and nobody else needs to be informed because they can't help anyway. Squawk codes aren't meant for desktop people like you who download some app and watch.
The differentiation between various scenarios is done by voice communication, there is no need to complicate the squawk system. Typically there is not more than one aircraft squawking 7700 at the same time in an airspace so the identification based on code 7700 is simple and effective.
If you check on sites like you will see how many incidents are worldwide - most of them are only incidents (and ending in a safe landing), but even then they will be considered an emergency while still in the air.
Where declaring emergency is useful is when ATC can actually help. Normally ATC tells pilots (under instrument rules, which all transport aircraft normally follow) where to fly. But when the pilots declare emergency, the controller gives them priority and now the pilot says what they need to do and the ATC will clear the way for them.
Depending on what the nature of the emergency is the pilots will request different things. If one engine quit, they'll probably request returning using turns towards the working engine only, if the gear got stuck they'll request low approach so someone from the tower can look at them with binoculars and tell them some more info about the state of that gear so they know better what to expect on landing, and then probably ask to do some circling to burn off fuel to reduce landing weight, and if a passenger is sick, they'll just ask for fastest possible approach and for ambulance to await them to take the sick to the nearest hospital.
Aircraft already receiving an air traffic service, and transmitting a code, should retain the code in use. Aircraft in an emergency, who are not receiving an air traffic service should set the transponder to EMERGENCY (Mode 3A Code 7700) as part of their initial actions.
The code (known as a 'squawk code', or 'transponder code') is used by ATC to identify and track the aircraft on radar screens at aerodromes and control centres. Aircraft are assigned a unique squawk code, which can be changed by air traffic control (through radio communication with the pilot) as needed to manage air traffic. Squawk codes are typically used in conjunction with a flight plan to help air traffic controllers keep track of an aircraft's location and intended flight path.
When a plane squawks, it means that the aircraft's transponder is transmitting a squawk code. The squawk code is transmitted via radio waves and can be picked up by radar systems, allowing air traffic controllers to identify and track the aircraft on their radar displays.
Squawk codes were first introduced in the 1940s as a way to identify and track aircraft on radar. Initially, the codes were simple two-digit numbers that were assigned to each aircraft by air traffic control and transmitted via the aircraft's transponder. Over time, the codes became more complex and were extended to four digits to allow for more unique combinations and greater precision in tracking aircraft.
In the early days of squawk codes, air traffic controllers would manually assign a code to each aircraft and instruct the pilots to enter the code into their transponder. This could be a time-consuming and error-prone process, especially in busy airspace. As a result, automated systems were developed to assign squawk codes automatically, based on the aircraft's flight plan and other factors. This helped to streamline the process and improve the accuracy and efficiency of air traffic control.
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