Ground Control Switch
The recorder (RCDR) panel consist of a cockpit voice recorder (CVR) and digital flight data recorder (DFDR) controls. On the ground, the RCDR automatically energizes for five minutes after electrical power application or continuously if at least one engine is running. It operates continuously in flight. The system stops automatically 5 minutes after the last engine is shutdown. Selecting the GND CTL switch to ON energizes both the CVR and DFDR.
ON - The ON function energizes the cockpit voice recorder (CVR) and digital flight data recorder (DFDR). This function is used to test the CVR and DFDR.
The CVR and DFDR are automatically energized during the following:
- On the ground for the first five minutes following electrical power application
- On the ground with at least one engine running
- Continuously in flight regardless if engines are operating
- The CVR and DFDR both stop automatically five minutes after the last engine is shut down.