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PTT signal to a communications system. Set the switch to I/C to
talk on the flight interphone system.
Set the control wheel PTT switch to MIC to send a PTT signal to
a communications system. Set the switch to INT to talk on the
flight interphone system.
The observer can only send a PTT from the hand microphone or
ACP.
FLIGHT INTERPHONE SYSTEM - PTT FUNCTION
EFFECTIVITY
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FLIGHT INTERPHONE SYSTEM - PTT FUNCTION
FLIGHT INTERPHONE SYSTEM - PTT FUNCTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
23-51-00-014
General
The remote electronics unit (REU) controls the communication
between these:
* Three flight deck stations
* Service interphone
* Flight interphone
* All related electronics equipment.
The REU contains three identical station cards. The cards are
for these crew members:
* Captain
* First officer
* Observer.
The REU also has an audio accessory unit (AAU) card. The card
contains circuitry for flight and service interphone, alert tone
generation and various audio accessory functions.
REU cards process these signals:
* REU inputs
* REU outputs
* AAU signals
* Emergency signals.
REU Inputs
Each station card in the REU receives audio from these
sources:
* Flight compartment microphones
* Communication transceivers
* Navigation receivers
* Passenger address amplifier
* AAU card aural alerts.
The station cards get control inputs from the audio control
panels (ACPs) and microphone push-to-talk (PTT) switches.
The mux receiver, in the REU, sends a data clock to the ACP.
The ACP replies back with crew selected receiver audio,
navigation signals, volume and particular transmitter.
The mux receiver responds to the crew inputs and sends
control signals to the following circuits:
* Receiver circuits
* Mic/PTT select logic
* Transmitter circuits
* Speaker mute/volume logic.
The receiver circuits receive audio inputs from the
communication and navigation systems, passenger address
amplifier, service interphone and flight interphone. The circuits
process the crew selected audio. The audio goes to summing
amplifiers. The summing amplifiers send the audio to the
speaker mute/volume logic circuits, CVR amplifier and
headphone amplifier.
FLIGHT INTERPHONE SYSTEM - REMOTE ELECTRONICS UNIT FUNCTIONAL DESCRIPTION
EFFECTIVITY
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The mux receiver sends boom/mask and interphone PTT
signals to the mic/PTT select logic. The mic/PTT select logic
processes input microphone audio and PTT signals. It routes
the selection to the transmitter circuits. The mic/PTT select logic
circuits process speaker mute signals and hot mic audio.
The transmitter circuits route the microphone audio and/or PTT
to the selected communication system.
The speaker mute/volume logic circuits process flight
compartment speaker muting and set the speaker volume to
the level as commanded from the mux receiver.
REU Outputs
Each station card sends audio to these:
* Headphones
* Headsets
* Voice recorder
* Flight compartment speakers from CAPT and F/O station
cards
* Communication transceivers
* Passenger address amplifier.
The station cards also send PTT signals to the communication
transceivers and the passenger address amplifier.
AAU Signals
The AAU uses these audio signals:
* Altitude alert
* Ground proximity alert
* Flight interphone
* Service interphone.
The flight control computers (FCCs) send an altitude alert
discrete to the AAU card. This input starts a C-chord generator.
The ground proximity computer and the weather radar receiver
transmitter send alert audio to the AAU card. The AAU card
combines this audio with the output from the altitude alert tone
generator and sends it to each station card summing amplifier.
The summing amplifier combines the AAU alert audio with
TCAS audio. Station cards amplify these signals and send them
to the voice recorder and speakers.
The flight interphone amplifier amplifies microphone audio from
　
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