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You hear alert signals on the flight interphone speakers only.
You can not turn off or adjust the volume of the alerts.
FLIGHT INTERPHONE SYSTEM - NAVIGATION INTERFACE
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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FLIGHT INTERPHONE SYSTEM - NAVIGATION INTERFACE
FLIGHT INTERPHONE SYSTEM - NAVIGATION INTERFACE
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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FLIGHT INTERPHONE SYSTEM - NAVIGATION INTERFACE
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The flight crew uses the audio control panels (ACPs) to control
audio for the communication and navigation systems. Each ACP
controls one station.
Controls
These are the controls on the ACP:
* Transmitter selectors
* Receiver switches
* Radio-Intercom PTT switch
* BOOM-MASK switch
* Filter switch
* ALT-NORM switch.
Microphone Selector Switches
The flight interphone system gets audio from these
microphones:
* Boom
* Oxygen mask
* Hand-held.
You push a transmitter selector to select a communication
transmitter or system. You can select only one system at a time.
When you push a transmitter selector, this happens:
* The selector switch light comes on
* The received audio comes on at the volume set by the
receiver volume control
* The microphone audio and PTT signals are enabled for that
system.
When you push a PTT switch, the microphone audio and PTT
signals go to the system set by the selector switches.
When the ACP initially gets power, the flight interphone system
is active.
Receiver Switches
Push the receiver switch (push-on, push-off) to listen to
communication or navigation system audio. Turn it to adjust
the volume. You can monitor any combination of systems at any
time.
CAUTION: DO NOT PULL THE RECEIVER SWITCH KNOBS.
THE RECEIVER SWITCHES ARE PUSH-ON/PUSHOFF
TYPE. THE KNOB IS IN WHEN THE CONTROL
IS ON, AND OUT WHEN OFF. IF YOU PULL THEM,
YOU MAY DAMAGE THEM.
FLIGHT INTERPHONE SYSTEM - AUDIO CONTROL PANEL
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
23-51-00-010
Radio-Intercom PTT Switch
The radio-intercom PTT switch is a three-position switch with
momentary contacts in the R/T and I/C positions. In the R/T
position, the microphone audio and PTT signals go to the
communication system set by the transmitter selectors. In the I/
C position, the boom or mask microphone jacks connect to the
flight interphone system. The radio-intercom PTT switch is in
parallel with the PTT switch on the control wheel.
BOOM-MASK Switch
The BOOM-MASK switch allows selection of the boom
microphone jack or the oxygen mask microphone as an audio
source. The microphone audio goes to the communication
system selected by the transmitter selector and the PTT
switches.
Filter Switch
The filter switch controls the filter that processes the navigation
audio you receive. This switch has these positions:
* V (voice) position passes only voice frequencies through the
filter and blocks the 1020 hz range frequency.
* B (both) position passes voice and range (coded station
identification) frequencies through the filter to the audio
output.
* R (range) position passes only range frequencies through
the filter and blocks voice frequencies.
ALT-NORM Switch
You use the ALT-NORM switch to select either normal or
emergency operation of the flight interphone system. Each
station operates independently.
When you select NORM, the flight interphone system operates
as usual.
When you select ALT, the flight interphone system operates in
the emergency mode. The only ACP controls that operate are
the BOOM-MASK switch and the R/T position of the PTT switch.
The hand-mic does not operate.
When you select ALT on the captain or observer ACP, you hear
receiver audio from the VHF-1 transceiver at the headphone
and headset jacks. When you key the MIC, the audio and PTT
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