Final answer:
The conditions for the CVR ERASE button to be operative are the aircraft must be on the ground and the CVR must be full.
Step-by-step explanation:
The conditions that must be met for the CVR ERASE button to be operative are:
- The aircraft must be on the ground. The CVR ERASE button is typically locked during flight for safety reasons.
- The CVR must be full in order for the ERASE button to be used. This means that the storage capacity of the CVR has been reached and it cannot record any more data.
- The CVR ERASE button must be functional. It may be disabled or locked for maintenance or other reasons, preventing its operation.
Therefore, options A) The aircraft must be on the ground, and C) The CVR must be full, must be met for the CVR ERASE button to be operative.