.
a single tone is audible through the headphone jack.

Monitor Indicator
Pointer deflection indicates recording or erasure on all four channels (approximately a one second delay); during test, pointer rises into green band.

Area Microphone
Active anytime 115V AC is applied to airplane.

HEADSET Jack
Headset may be plugged into jack to monitor tone transmission during test, or to monitor playback of voice audio.
Copyright . The Boeing Company. See title page for details.
5.10.16  December 3, 2004

Communications -Controls and Indicators 737 Operations Manual

ERASE Switch
Push (14 seconds) –
.
all four channels are erased

.
monitor indicator momentarily deflects
. operates only when airplane is on ground and parking brake is set.

TEST Switch
Push –
.
after a slight delay, monitor indicator rises into green band

.
a tone may be heard through a headset plugged into HEADSET jack.

Monitor Indicator
Flashes twice during test to indicate proper operation.

Area Microphone
Active anytime 115V AC is applied to airplane.

HEADSET Jack
Headset may be plugged into jack to monitor tone transmission during test, or to monitor playback of voice audio.

TEST Switch
Push –
.
the monitor light flashes twice

.  
a double tone may be heard through a headset plugged into HEADSET
jack followed by another double tone.

Communications -Controls and Indicators 737 Operations Manual

ERASE Switch
Push (14 seconds) –
.
all four channels are erased

.
monitor indicator momentarily deflects
. operates only when airplane is on ground and parking brake is set.

Call System

FWD OVHD PANEL

CONNECTOR PANEL ATTENDANT PANELS

Ground Call (GRD CALL) Switch
Push – sounds a horn in nose wheel well until released.

Attendant Call (ATTEND CALL) Switch
Push –
.
sounds a two-tone chime in the passenger cabin.

.
illuminates both pink master call lights.

Flight Deck CALL Light
Illuminated (blue) – flight deck is being called by flight attendants or ground crew.
Extinguished when Captain Call or Pilot Call switch released.

Copyright . The Boeing Company. See title page for details.
5.10.18  June 7, 2002

Communications -Controls and Indicators 737 Operations Manual

PILOT CALL Switch
Push – sounds a single–tone chime in flight deck.
Flight deck CALL light extinguished when switch is released.

CAPTAIN Call Switch
Push – sounds a single–tone chime in flight deck
Flight deck CALL light extinguished when switch is released.

ATTENDANT Call Switch
Push –
.
sounds a two–tone chime in passenger cabin

.
illuminates both pink master call lights.

Call RESET Switch
Push – extinguishes both pink master call lights.

Master Call Light
Illuminated –
.  
amber – a lavatory call switch is activated or on some airplanes, smoke has been detected in a lavatory

.
pink – flight deck or other flight attendant station is calling

.
blue – a passenger seat call switch is activated.

Selective Calling Panel (SELCAL)

SELCAL Reset Switch
Push – extinguishes SELCAL light and resets decoder.
Copyright . The Boeing Company. See title page for details.
June 7, 2002   5.10.19
Communications -Controls and Indicators 737 Operations Manual

SELCAL Light
Illuminated–
.
alerts crew that communication is desired on a communication radio

.
SELCAL 1 light illuminates for a call on VHF–1, VHF–2, or HF–1

.
SELCAL 2 light illuminates for a call on VHF–2, VHF–3, or HF–1.

Copyright . The Boeing Company. See title page for details.
5.10.20  June 7, 2002

737 Operations Manual

Introduction
The communication system includes:
.
radio communication system

.
interphone communication system

.
cockpit voice recorder system

.
communication crew alerting system The communication systems are controlled using the:

.
audio selector panels

.
radio tuning panels

Audio Systems and Audio Selector Panels
An ASP is installed at the Captain, First Officer, and Observer stations. Each panel controls an independent crew station audio system and allows the crewmember to select the desired radios, navigation aids, interphones, and PA systems for monitoring and transmission.
　
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