NAVIGATION AND
COMMUNICATION
AIRPLANE
OPERATIONS
MANUAL
2-18-25
Page
2
Code
01
REVISION 29
ERASE FUNCTION
Previously recorded CVR data may be made unavailable if the ERASE
button on the CVR control panel is pressed, provided the airplane is on
the ground and with the parking brake applied. In this case, only the
CVR manufacturer (for Honeywell equipment) will be able to recover
the “erased” data.
When the ERASE button is pressed (for 2 seconds for L3 equipment),
a two-second 400 Hz tone may be heard from a headphone plugged to
the CVR control panel jack, confirming that the erase command was
successful.
COCKPIT VOICE RECORDER CONTROLS AND
INDICATORS
1 - ERASE BUTTON
− Erases previously recorded data from the crash survivable
memory.
− Function is available only on the ground, with the parking brake
applied.
2 - TEST BUTTON
− Tests system integrity.
− A successful self-test results in a one second activation of the
status LED.
− In case of failure, the status LED on the control panel is not
activated.
3 - HEADPHONE JACK
− Allows plugging a headphone to monitor the test tone, the erase
tone and recorded audio signals.
4 - STATUS LED
− Illuminates during one second to indicate a successful test.
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