Which transponder code should be used in the event of an emergency?

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In aviation, transponder codes are used for different situations that require communication with air traffic control. The code designated for emergency situations is 7700. This code alerts air traffic controllers that an aircraft is experiencing an emergency, allowing them to prioritize the aircraft's needs and provide the necessary assistance.

Using transponder code 7700 effectively communicates distress, which can include serious situations such as mechanical failure, medical emergencies, or other critical incidents. When this code is activated, it enhances the situational awareness of both air traffic control and nearby aircraft, enabling quick and coordinated responses.

The other options represent different situations: 7500 is used to indicate unlawful interference or hijacking, while 7600 communicates a radio failure. Lastly, 7800 does not exist as a standard transponder code in emergency situations.

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