For example, "1200" in the USA means that the flight is flying under Visual
Adjust your transponder as air traffic control instructs. In the absence of air traffic control instructions, adjust as follows: Visual flight rules (VFR) at or below 12,500 feet above sea level (ASL): Mode A, Code 1200, plus Mode C. VFR above 12,500 feet ASL: Mode A, Code 1400, plus Mode C.
SQUAWK codes are four digits and they are used to easily identify a specific aircraft when detected on a radar, or to determine what an aircraft needs in the case of an emergency or situation in which a flight plan needs to be changed.
0000 — A generic code that is not assigned and should not be used. 1200 — VFR aircraft. The default code for all flights–if you aren't asked to set anything else, you should set 1200. 7500 — Hijacking. 7600 — Voice radio failure.
The aircraft must squawk code 1201 for WN35 or 1204 for 90WA to indicate the pilot's intent to arrive or depart the airport. Pilots must exit the TFR via the most direct route before proceeding on course, or if arriving, enter the TFR and proceed to either WN35 or 90WA via the most direct and shortest route.
Emergency codes
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?
Famous Squawk codes
The first of these is the code 7500, which signals “unlawful interference,” more commonly referred to as hijacking. This is a situation where squawking is particularly useful, as it allows the pilots to contact ATC discreetly.
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. It's up to the crew to let ATC know what the exact situation is.
Series 20 — Code 2000 is to recognize an aircraft that has not received instructions from the air traffic control units to operate the transponder.
Code 7400 may be displayed by unmanned aircraft systems (UAS) when the control link between the aircraft and the pilot is lost. Lost link procedures are programmed into the flight management system and associated with the flight plan being flown.
Squawk 7000: This is the 'conspicuity code' for VFR aircraft that are not assigned a specific code by ATC. Squawk 2000: This is the 'conspicuity code' for IFR aircraft that are not assigned a specific code by ATC.
1200 — VFR
Transponder Operation Under Visual Flight Rules (VFR): Unless otherwise instructed by an ATC facility, adjust transponder to reply on Mode 3/A Code 1200 regardless of altitude.
Transponders back then (and still today) have the option of numbers 0-7. That's because each number can be represented by only three bits, or three 1s or 0s.
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.
what does a red plane mean on the app? Red icons indicate aircraft that are squawking 7600 or 7700.
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.
Squawking 7700 in an emergency
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.
A squawk of 4000 observed on radar by a controller usually meant that the aircraft operating in Special Use Airspace, exceeding 250 knots below 10,000 feet and/or rapidly maneuvering. It also normally means that they are not talking to an ATC facility.
1) Squawk 7600 (Regardless Of Where You Plan To Land)
By squawking 7600 (lost communications squawk code), ATC will know you've had a communications failure. Even if you weren't talking to ATC before, they'll notice you now if you're in a radar covered area.
Squawk codes are four-digit codes ranging from 0000 all the way through to 7777 that are set on an aircraft transponder.
121.5 MHz and 243.0 MHz.
The squawk codes: 7700 for emergencies, 7600 for communication failure, or 7500 for hijack.