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signals go to the VHF-1 transceiver.
When you select ALT on the first officer ACP, you hear receiver
audio from the VHF-2 transceiver at the headphone and headset
jacks. When you key the MIC, the audio and PTT signals go to
the VHF-2 transceiver.
FLIGHT INTERPHONE SYSTEM - AUDIO CONTROL PANEL
EFFECTIVITY
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Purpose
The remote electronics unit (REU) controls audio signals in the
flight interphone system.
Physical Description
The REU has these physical properties:
* Length is 17.6 in. (320 mm)
* Height is 7.62 inches (194 mm)
* Width is 3.58 inches (90.0 mm)
* Weight is 7.75 pounds (35.2 kg).
Functions
The REU uses the ACP selections to connect these signals:
* Communication transceiver audio
* Navigation receiver audio
* Passenger address audio
* Service interphone audio
* Flight interphone.
SHZ 009-999
The AURAL WARN MUTE switch on the front panel of the REU
activates the muting of the aural warning signal in the
headphones. The switch is a ten position rotary switch. The
switch is in the active muting position when it is horizontal to the
bottom edge of the front panel.
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EFFECTIVITY
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EFFECTIVITY
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Purpose
The control wheel PTT switch gives push-to-talk input for the
boom or oxygen mask microphones.
Description and Controls
The control wheel PTT switch is a three position switch. It is on
the outboard horn of the captain’s and the first officer’s control
wheel. These are the switch positions:
* MIC - microphone audio and PTT signals go to the
communication system you select
* OFF - The ACP PTT switch can key the microphone
* INT - microphone audio goes to the flight interphone system
(ACP selection is not changed).
The switch is spring loaded to the middle OFF position.
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EFFECTIVITY
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General
You use the audio control panel (ACP) to select the audio for
headsets and flight interphone speakers. ACPs also select a
communication system.
　
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