Under which circumstances should the pilot set the code 7600 on the transponder?
Refer to figure.
The SSR (Secondary Surveillance Radar) transponder is an airborne device that responds to radar interrogations from ground-based systems, sending back information such as the aircraft's identity, altitude, and position to air traffic controllers, enhancing tracking and communication.
A transponder code, or "squawk code," is used by an aircraft's transponder to identify the aircraft on radar and communicate specific information to air traffic control, such as the aircraft's identity, flight status, and emergency situations.
ICAO Doc 4444 - Air Traffic Management
8.5.2 SSR code management
8.5.2.1 Codes 7700, 7600 and 7500 shall be reserved internationally for use by pilots encountering a state of emergency, radiocommunication failure or unlawful interference, respectively.
Useful mnemonic:
- Code 7500 → Unlawful interference ("75 - man with a knife")
- Code 7600 → Radio failure ("76 - I need a radio fix")
- Code 7700 → Emergency/distress ("77 - going to heaven")
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