CVR Erase Button
ERASE - When the ERASE button is pushed for two seconds,it erases the CVR tape, provided the airplane is on the ground and the parking brake handle is ON.
DESCRIPTION - The cockpit voice recorder is located in the aft section of the airplane, and is equipped with an underwater locating beacon. The system records direct conversations between crew members through a cockpit area microphone and boom microphones, aural cockpit warnings, inter communications and radio transmissions.
The passenger address system is also recorded if the PA reception knob is selected on. Only the last 30 minutes of recording is retained.