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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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* The ACARS management unit when the ground station calls
the flight crew through the ACARS network 22.
AURAL WARNING SYSTEM - INTERFACES
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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AURAL WARNING SYSTEM - INTERFACES
AURAL WARNING SYSTEM - INTERFACES
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
31-51-00-004
Purpose
The aural warning module receives discrete inputs from
various systems. The aural warning module uses these inputs
to make aural alert sounds for the flight crew.
Aural Warning Module Channels
The aural warning module has two channels. Each channel is
the same. The two channels are connected in parallel. If one
channel fails, the audio output of the aural warning module will
decrease by 6db.
Test Switch
A test switch is on the top of the aural warning module. The test
switch checks operation of both channels of the aural warning
module.
AURAL WARNING SYSTEM - AURAL WARNING MODULE
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AURAL WARNING SYSTEM - AURAL WARNING MODULE
AURAL WARNING SYSTEM - AURAL WARNING MODULE
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D633A101-SHZ1 Jun 10/2003
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AURAL WARNING SYSTEM - AURAL WARNING MODULE
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D633A101-SHZ1 Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The aural warning module has two parallel channels, channel A
and channel B. Both channels receive inputs from the airplane
systems. Both channels operate at the same time.
If one channel fails, the flight crew will hear a 6db decrease in
volume from the aural warning module.
Each channel has these components:
* Power supply
* Discrete ground input circuit
* Discrete power input circuit
* Controller circuit
* Two aural synthesizers
* Analog amplifier
* Speaker.
There is a built-in test equipment (BITE) switch on the aural
warning module. Each channel receives a signal from the BITE
switch.
Input Circuit
Each channel has two input circuits. One circuit receives
discrete ground inputs, the other receives power (28v dc)
discrete inputs.
Discrete inputs from the crew call system, the SELCAL system,
and the ACARS are power discretes. All other inputs are
discrete grounds.
Controller
The controller receives signals from both input circuits and
causes the aural synthesizer to make sounds. It controls the
sequence of some sounds made by the synthesizer. This is the
sequence of the sounds from most important to least important:
* Intermittent horn
* Steady horn
* Wailer.
The bell, the clacker, and the chime sounds do not have a
sequence. The controller permits these sounds at the same
time as any other sound.
Aural Synthesizer
The aural synthesizers make all the sounds that the pilots hear
from the aural warning module. One aural synthesizer makes
the bell and clacker sounds. The other aural synthesizer makes
the horn, wailer, and chime sounds. The synthesizers can make
more than one sound at a time.
Analog Amplifier
The analog amplifier adds the signals from both synthesizers.
The amplifier also increases the signal strength from the aural
synthesizers and sends it to the speaker.
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Speaker
The speakers provide the sound. Channel A drives the top
speaker. Channel B drives the bottom speaker. When there is
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