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.
5.10.6 D6-27370-866-EGP
5 Filter Switch
V (Voice) – receive NAV and ADF voice audio.
B (Both) – receive NAV and ADF voice and range audio.
R (Range) – receive NAV and ADF station identifier range (code) audio.
6 Ground Crew Call Light
Illuminated - Indicates call to flight deck initiated by ground crew with Pilot Call
Switch at external power receptacle. Light will extinguish when ground crew
releases switch. Accompanied by single high tone chime.
7 Cabin Call Light
Illuminated – Indicates call to flight deck by attendant. Accompanied by single
high tone chime.
8 Speaker (SPKR) Switch
Illuminated (white) – SPKR switch is active.
Push – audio from selected receiver is heard on overhead speaker.
Rotate – adjusts overhead speaker volume.
Push again – deselects audio from selected receiver to be heard on overhead
speaker.
9 Alternate–Normal (ALT–NORM) Switch
NORM (Normal) – ACP operates normally.
ALT (Alternate) – ACP operates in degraded mode.
September 15, 2016
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