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COMMUNICATIONS
Sec. 6.5 TOC-4 737
Rev. 11/15/02 #41 Continental Flight Manual
INTENTIONALLY LEFT BLANK
COMMUNICATIONS
737 Sec. 6.5 Page 1
Flight Manual Continental Rev. 11/15/02 #41
SYSTEM DESCRIPTION
INTRODUCTION
The communication system includes:
· Radio communication system
· Interphone communication system
· Voice recorder system
· Communication crew alerting system.
The communication systems are controlled using the:
· Audio control panels
· Radio tuning panels.
Audio Systems & Audio Selector Panels
An audio selector panel (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 system for monitoring or transmission.
Transmitter selectors on each ASP select one radio or interphone for
transmission by that crewmember. Any microphone at that crew station may
then be keyed to transmit on the selected system.
> Receiver switches select the systems to be monitored. Any combination of
systems may be selected. Receiver switches also control the volume at the
respective crew stations. Audio from the selected systems is adjusted for
volume and amplified by an amplifier in the audio selector panel. This audio is
then routed to the headset jack and speaker at that crew station.
A second amplifier is provided in each ASP as an alternate in the event of an
amplifier failure. It can be selected with the ASP amplifier switch.
>@BCD Receiver switches select the systems to be monitored.
Any combination of systems may be selected. Receiver switches also control
the volume for the headset and speaker at the respective crew stations. Speaker
and headset audio for each crew station come from a Remote Electronics Unit
located in the E & E compartment. It is controlled by the Audio Selector
Panels, and has separate independent circuits for each crew stations.
COMMUNICATIONS
Sec. 6.5 Page 2 737
Rev. 11/15/02 #41 Continental Flight Manual
Audio warnings for altitude alert, the ground proximity warning system and
windshear are also heard through the speakers and headsets at preset volumes.
They cannot be controlled or turned off by the crew.
Speakers and Headsets
Each crew station has a headset or headphone jack. The Captain and First
Officer have speakers on the ceiling above their seats. There is no speaker at
the observer station.
> Headset volume is only controlled by the receiver switches. Speaker
volume is controlled by the receiver switches and also the speaker on / off
volume control. Each speaker has an integral amplifier which only amplifies
audio for that speaker.
>@BCD The speakers and headsets receive audio from the Remote
Electronics Unit, as controlled by the respective Audio Selector Panels.
Headset volume is controlled by the receiver switches and also the speaker
switch.
Microphones
Hand microphones and boom microphones may be plugged into the respective
jacks at the flight deck crew stations. Each oxygen mask also has an integral
microphone.
Each hand microphone has a push-to-talk switch to key the selected audio
system. The push-to-talk switches on the control wheel or ASP are used to key
the oxygen mask or boom microphone, as selected by the MASK-BOOM switch.
The MASK-BOOM switch does not affect the operation of the hand microphone.
COMMUNICATIONS
737 Sec. 6.5 Page 3
Flight Manual Continental Rev. 11/15/02 #41
> Audio Selector Panel (ASP)
< 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.
COMMUNICATIONS
Sec. 6.5 Page 4 737
Rev. 11/15/02 #41 Continental Flight Manual
> Push-To-Talk Switch (spring-loaded to neutral position)
R/T (Radio-Transmit) – Keys oxygen mask or boom microphone for
transmissions as selected by transmitter selector.
I/C (Intercom) – Keys oxygen mask or boom microphone for direct
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