How can the Cockpit Voice Recorder (CVR) be manually energized?

The Cockpit Voice Recorder (CVR) can be manually energized by using the GND CTL switch to the ON position. This switch is designed to allow crews to activate certain onboard systems for maintenance or testing purposes while on the ground, including the CVR. When this switch is engaged, it provides power to the CVR, allowing it to record cockpit audio.

Using other options like the CVR TEST switch activates a self-test functionality for the CVR, but it does not primarily energize the recorder for operation. Similarly, the CVR ERASE switch is intended for erasing the recorded data in the CVR, which is not related to energizing it for recording. The CVR ANNUNCIATE switch serves to visually indicate the operational status or alerts of the CVR rather than energizing it.

Therefore, setting the GND CTL switch to ON is the correct method to ensure the CVR is powered and able to record voice data, fulfilling the requirement highlighted in this question.