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Pilots Use Secret Codes 7500, 7600, 7700 to Signal Emergencies, Not Just 'Hijack'
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News18•01-10-2026, 12:46
Pilots Use Secret Codes 7500, 7600, 7700 to Signal Emergencies, Not Just 'Hijack'
- •Aircraft use four-digit transponder codes like 7500, 7600, and 7700 to alert air traffic control to emergencies without explicit radio communication.
- •Code 7500 signals unlawful interference or hijacking, 7600 indicates radio communication failure, and 7700 denotes a general emergency.
- •These codes are standard aviation procedures, allowing controllers to identify aircraft needing special attention and apply specific protocols.
- •The codes are crucial when speaking openly on the radio is not possible or appropriate, providing an immediate indication of the situation.
- •Controllers verify the code selection and, if confirmed or no response, proceed with emergency procedures without further questioning.
Key Questions Answered
Code 7500 indicates that an aircraft is experiencing unlawful interference, such as a hijacking situation or being forced to a new destination.
Code 7600 is used to signal a total loss of two-way radio communication between the flight crew and air traffic control. In contrast, Code 7700 is designated for a general emergency when an aircraft requires special attention and has not necessarily lost communication.
When controllers observe Code 7500, they are required to verify with the pilot whether the selection was intentional. If the pilot confirms the unlawful interference or does not respond, controllers apply hijack procedures, stop asking further questions, continue flight-following, and notify the appropriate authorities.
