.
(counterclockwise) decreases sensitivity to reduce noise and static.

Note:  decreasing sensitivity too far prevents reception, including SELCAL monitoring of HF radio.
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December 1, 2000   5.10.5
Communications -Controls and Indicators 737 Operations Manual

Intentionally
Blank

Copyright . The Boeing Company. See title page for details.
5.10.6  December 1, 2000

Communications -Controls and Indicators
Audio Selector Panel (ASP)

As installed
FLIGHT DECK CREW STATIONS

As installed
FLIGHT DECK CREW STATIONS
Communications -Controls and Indicators 737 Operations Manual

Transmitter Selector (MIC SELECTOR) Switches
Illuminated (white) – related switch is active. Push –
.
selects related communication system for transmission

.  only one switch may be selected at a time; pushing a different switch
deselects active switch

.  
receiver also selected on regardless of whether related receiver switch is
on.

Receiver Switches
Illuminated (white) – related switch is active.
Rotate – adjusts volume.
Push –

.
receiver selected for related communication system or navigation receiver

.
multiple switches may be selected Push again – deselects related system or receiver.

Push–to–talk Switch
(spring–loaded to neutral position)
R/T (radio–transmit) –keys oxygen mask or boom microphone for transmission as
selected by transmitter selector.

I/C (Intercom) – keys oxygen mask or boom microphone for direct transmission
over flight interphone and bypasses transmitter selector.

MASK–BOOM Switch
MASK – selects oxygen mask for transmissions. BOOM – selects boom microphone for transmissions.

Speaker (SPKR) Switch
Illuminated (white) – SPKR switch is active.
Push – audio from selected receiver switches is heard on overhead speaker.
Rotate – adjusts overhead speaker volume.
Push again – deselects audio from selected receiver switches to be heard on

overhead speaker.

Alternate–Normal (ALT–NORM) Switch
NORM (Normal) – ASP operates normally.
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5.10.8   June 7, 2002
Communications -
ALT (Alternate) – ASP operates in degraded mode.

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.

Transmitter Selector (MIC SELECTOR) Switches
Illuminated (white) – related switch is active.
Push –

.
selects related communication system for transmission

.  only one switch may be selected at a time; pushing a different switch
deselects active switch

.  
receiver also selected on regardless of whether related receiver switch is on.

Receiver Switches
Illuminated (white) – related switch is active.
Rotate – adjusts volume.

Communications -Controls and Indicators 737 Operations Manual

Push –
.
receiver selected for related communication system or navigation receiver

.
multiple switches may be selected Push again – deselects related system or receiver.

Push–to–talk Switch
(spring–loaded to neutral position)
R/T (radio–transmit) –keys oxygen mask or boom microphone for transmission as selected by transmitter selector. I/C (Intercom) – keys oxygen mask or boom microphone for direct transmission
over flight interphone and bypasses transmitter selector.

MASK–BOOM Switch
MASK – selects oxygen mask for transmissions. BOOM – selects boom microphone for transmissions.

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.

Copyright . The Boeing Company. See title page for details.
5.10.10  June 7, 2002
Communications -Controls and Indicators
737 Operations Manual
Miscellaneous Communication Controls (Typical)
6
OVERHEAD 
1  VOL  SPEAKER  HAND MICROPHONE 
1  1 
BOOM 
MICROPHONE/ HEADSET  OXYGEN MASK MICROPHONE 
　
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