737 MAX Flight Crew Operations Manual
Communications -
Controls and Indicators
5.10.16
MN-FLT-OH-201
2
ERASE Switch (red)
Push (2 seconds) –
• all four channels are erased
• operative only when airplane is on ground and parking brake is set.
1B401, 1B402, 1B801 - 1B824
3
TEST Switch
Push – for 5 seconds:
• STATUS light flashes once
• a tone may be heard through a headset plugged into HEADPHONE
jack.
1B785, 1B786, 1J585 - 1J594
3
TEST Switch (green)
Push –
• hold for 5 seconds.
• the TEST light illuminates.
• a tone may be heard through a headset plugged into the voice recorder
headset jack.
• the TEST light remains illuminated until the switch is released.
1B785, 1B786, 1J585 - 1J594
4
HEADSET Jack
Headset may be plugged into jack to monitor tone transmission during test, or to
monitor playback of voice audio.
1B401, 1B402, 1B801 - 1B824
4
HEADPHONE Jack
Headphone may be plugged into jack to monitor tone transmission during test, or
to monitor playback of voice audio.
1B401, 1B402, 1B801 - 1B824
5
STATUS Light
Illuminated (momentary green) – no faults are detected during recorder TEST.
1B785, 1B786, 1J585 - 1J594
5
TEST Light
Illuminates (green) - when the TEST switch is depressed and either an engine is
running or the Cockpit Voice Recorder Switch is in the ON position.
Cockpit Voice Recorder Switch
1B401 - 1B786, 1J585 - 1J594
VOICE
RECORDER
AUTO
ON
FORWARD OVERHEAD PANEL
1
October 26, 2021