What is the purpose of a signal check performed during flight?

Performing a signal check during flight serves to ensure that communication systems are functioning effectively while the aircraft is airborne. This is crucial for maintaining contact with air traffic control and other relevant parties during flight operations. Conducting a signal check in the air allows pilots to verify that their equipment is working as intended in real-time, identifying any issues that could affect safety.

It is important for aviation professionals to be able to assess and confirm signal integrity while in flight to ensure reliable communications, which can be critical for operational safety. Options addressing radio frequency presets, emergency frequency access, or evaluating aircraft heading pertain to other aspects of communication and navigation but do not capture the primary intent behind executing a signal check during flight operations.