Pilots are taught to prioritise flying the aircraft above all else. Controllers are aware that then when a pilot declares an emergency their workload will increase substantially. If the crew declare “MAYDAY MAYDAY MAYDAY” often the first reply from ATC is “Copy your MAYDAY”, or something to that effect. If there is no communication from the aircraft you can expect ATC to attempt to make contact. This is to alert nearby sectors to the emergency.
The alert will show up on all sectors that are within range, regardless of the altitude limit sit on the individual scope. Also the “tag” (showing the aircrafts callsign) will flash with “EM” for emergency. When a pilot enters 7700 into the transponder and audible alarm will be triggered at the Air Traffic Controllers station. For example, a sudden loss of cabin pressurization may result in an emergency descent to a lower level – usually 10,000′, or the MSA (Minimum Safe Altitude) if higher. Setting a squawk of 7700 signifies a MAYDAY situation and alerts Air Traffic Control and other units that may be airborne (SAR, AWACS etc.) that the aircraft has an emergency and may not be able to comply with ATC clearances. Link: FAA Notice – Squawk 4400 Unmanned Aircraft System – Lost Link hijack) 7600 Radio communications failure 7700 Emergency 7777 DOD interceptor aircraft on active air-defense missions used when exiting Oceanic Airspace before a squawk is assigned by ATC 4440-4452 Operations above FL600 (NASA, SR-71,U-2) 7000 Visual Flight Rules (VFR) – ICAO 7001 Sudden military climb-out from low-level operations (U.K.) 7004 Aerobatic/Display operations 7400 Unmanned Aircraft System (UAS) Lost Communication Link 7500 Unlawful interference (i.e.
and Canada 2000 Used when entering SSR airspace from non-SSR airspace. Some ATC squawk codes are resaved for certain situations, such as: Squawk Code Meaning 1000 Conspicuity code – ADS-B/Mode-S flight number used for identification 1200 Visual Flight Rules (VFR) – U.S.
What are other squawk codes that are reserved? From fascinating stories at the dawn of aviation to modern day aircraft accidents. The 5 Best Aviation Audiobooks (Chosen by a Pilot) A list of the best aviation audiobooks chosen by a current airline pilot. It may be assigned by Air Traffic Control or the pilots may decide to enter it into their transponder themselves.
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