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. ![]() Mayday Example: ThomsonFly Mayday at Manchesterħ700 is a squawk code that is reserved for emergency situations and immediately alerts Air Traffic Control (ATC) and other units that the aircraft squawking 7700 is in distress.What happens when a pilot squawks 7700?.What are other squawk codes that are reserved?.
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