737 Flight Crew Operations Manual
Communications -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 5.10.13
1 Area Microphone
Active anytime 115V AC is applied to airplane.
2 ERASE Switch (red)
Push (2 seconds) –
• all four channels are erased
• operative only when airplane is on ground and parking brake is set.
YK981 - YK995, YW273, YW274
3 TEST Switch
Push – for 5 seconds:
• STATUS light flashes once
• a tone may be heard through a headset plugged into HEADPHONE
jack.
YK996 - YQ456
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.
YK996 - YQ456
4 HEADSET Jack
Headset may be plugged into jack to monitor tone transmission during test, or to
monitor playback of voice audio.
YK981 - YK995, YW273, YW274
4 HEADPHONE Jack
Headphone may be plugged into jack to monitor tone transmission during test, or
to monitor playback of voice audio.
YK981 - YK995, YW273, YW274
5 STATUS Light
Illuminated (momentary green) – no faults are detected during recorder TEST.
YK996 - YQ456
5 TEST Light
Illuminates (green) - when the TEST switch is depressed.
September 15, 2016
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