What does loss of communication indicate in terms of transponder codes?

The loss of communication is indicated by the transponder code 7600. When a pilot experiences a failure in communication with air traffic control, they are instructed to set their transponder to this specific code. This helps air traffic controllers identify the aircraft as having communication difficulties and allows them to provide additional assistance or re-routing if necessary.

Using the transponder code 7600 effectively alerts all relevant parties about the situation so that appropriate measures can be taken, ensuring safety in the airspace. Identifying this code accurately is essential for pilots, students, and aviation professionals to respond correctly in emergencies involving communication failures.