NOTE SIMULATED as part of the Q4XP, but here are some notes on it anyway.

AREA MICROPHONE

• the Cockpit Voice Recorder (SSCVR) system records the following channels of audio inputs: • Pilot • Copilot • Observer and Passenger Address (PA) • Flight deck area microphone

STATUS ANNUNCIATOR (red)

FOR 1 SECOND - indicates successful self test CONTINUOUSLY - failure condition exists

ERASE PUSHBUTTON (momentary action)

PUSH - when pushed for 0.5 seconds or longer, erases all audio data when the parking brake is set and the aeroplane is on the ground

• it erases all audio data within 5 seconds of the selection
• the erase function is verified by a 400Hz tone in the HEADPHONE jack

TEST pushbutton (momentary action)

PUSH - momentarily pushed to test the CVR

• the CVR gives the following results within 3 seconds of successfully completing the self-test that follow: • an 800 Hz aural tone for 2 seconds at the audio monitor HEADPHONE output jack • the red STATUS indication turns on for 1 second on the Microphone Monitor Unit (MMU)

HEADPHONE JACK

gives a continuous audio output channel which is the composite of the four audio input channels in real time