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the control signal to the REU.
The microphone audio can come from the hand microphone or
the oxygen mask microphone.
When you use the hand microphone, the REU decreases the
volume to the flight compartment speakers. The PTT discrete
signal from the hand mic goes directly to the REU.
The REU sends audio to the headphone.
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Remote Electronics Unit
The REU controls the audio in the flight interphone system.
The REU gets control and PTT signals from the audio control
panels (ACPs). The REU sends timing signals to the ACPs to
control the data multiplexing.
Communication Transceivers
The communication transceivers get microphone audio and
PTT discretes from the REU. The transceivers send audio
outputs to the REU. The REU uses these transceivers:
* Very high frequency (VHF)
* High frequency (HF).
Passenger Address Amplifier
The REU sends audio and PTT signals to the passenger
address (PA) amplifier. The REU receives sidetone audio from
the PA amplifier.
REU front panel potentiometers, PA SENSE and PA GAIN,
connect to the PA amplifier. The PA SENSE sets the PA
amplifier microphone input level. The PA GAIN sets the PA
amplifier main power amplifier output level.
Voice Recorder
The REU sends audio from the captain, first officer, and
observer to the voice recorder.
Service Interphone System
The REU sends audio to the service interphone system when
you select service interphone on the ACP. Service interphone
audio is available at all service interphone stations and
attendant handsets.
Flight Interphone Jack
The ground crew uses the flight interphone jack at the P19
external power panel to talk to the flight crew.
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Navigation Interfaces
These navigation radio systems send audio signals to the REU:
* Multi-mode receiver (MMR)
* VHF omnidirectional range (VOR)/marker beacon system
* Automatic direction finder (ADF) system
* Distance measuring equipment (DME) system.
The REU pairs the DME with either the MMR or VOR audio. The
REU sets the DME audio level at a lower level than the MMR or
VOR audio.
Audio Alerts
These systems send audio alert signals to the REU:
* Flight control computer (FCC) - altitude alert
* Traffic alert and collision avoidance system (TCAS)
* WXR receiver transmitter
* Ground proximity warning computer (GPWC).
The FCC sends a ground discrete to start the altitude alert
signal. The REU supplies a C-chord aural with each ground
discrete. The REU sums and amplifies TCAS, GPWC, WXR, and
C-chord audio alert signals.
You hear alert signals on these flight components:
* Interphone headsets
* Headphones
* Speakers.
You can not turn off or adjust the volume of the alerts.
　
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