What must a pilot do if they lose communication with ATC during flight?

• A. Immediately land
• B. Squawk 7600
• C. Fly at a lower altitude
• D. Change frequency to a predetermined channel

Answer: (B)

When a pilot loses communication with ATC during flight, the correct protocol is to squawk 7600. This transponder code is universally recognized as a signal indicating that the aircraft has lost its ability to communicate with air traffic control. By using this code, the pilot alerts ATC and other aircraft in the vicinity of their communication failure, allowing for appropriate measures to be taken to ensure safety.

Squawking 7600 also helps provide situational awareness to other pilots and controllers, aiding in the management of airspace and traffic. Once this code is activated, the pilot should continue to fly according to the last instructions received and be prepared to land at the nearest suitable airport if necessary. This approach enhances safety and helps facilitate communication recovery when possible.

The other options, while they might include reasonable actions in different contexts, are not the immediate or appropriate response to a loss of communication with ATC. For instance, immediately landing might not be possible or safe depending on the aircraft's situation and traffic conditions. Flying at a lower altitude is not a standard procedure for communication loss and could lead to conflicts with other air traffic. Changing frequency to a predetermined channel is also unnecessary since the problem lies with communication; the established protocol is to squawk 7600