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The aural warning module is the only component in the aural
warning system. System monitor circuits detect incorrect
system conditions and flight crew alerts. The monitor circuits
supply discrete signals to the aural warning module.
These are the discrete inputs to the aural warning system:
* Unsafe landing warning
* Unsafe takeoff warning
* Cabin pressure warning
* Autopilot disengage
* Overspeed warning
* Fire warning
* SELCAL alert
* ACARS alert
* Crew call.
The aural warning module gives these sounds in the flight
compartment:
* Fire bells
* Chimes
* Overspeed clackers
* Wailer
* Continuous horn
* Intermittent horn.
AURAL WARNING SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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AURAL WARNING SYSTEM - GENERAL DESCRIPTION
AURAL WARNING SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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General
The aural warning module is in the flight compartment. It is on
the aft right face of the P9 forward electronic panel.
The altitude horn cutout switch is on the P5 forward overhead
panel.
The master fire warning lights are on the P7 glareshield panel.
The landing gear warning horn cutout switch is on the P10
control stand.
The fire warning bell cutout switch is on the P8 aft electronic
panel.
AURAL WARNING SYSTEM - COMPONENT LOCATION
EFFECTIVITY
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AURAL WARNING SYSTEM - COMPONENT LOCATION
EFFECTIVITY
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Power
The aural warning module receives 28v dc from four circuit
breakers. Each circuit breaker supplies power for different
audio sounds.
Continuous Horn Inputs
To make the continuous horn sound, the aural warning module
receives a discrete input from the proximity switch electronics
unit (PSEU) for a landing warning.
Intermittent Horn Inputs
To make the intermittent horns sound, the aural warning
module receives discrete inputs from these units:
* Proximity switch electronics unit (PSEU) for a takeoff warning
* Cabin altitude panel for a cabin altitude warning.
Bell Inputs
To make the bell sound, the aural warning module receives
discrete inputs from these units:
* Engine and APU fire detection module for an engine or APU
fire
* Cargo smoke detection and fire suppression panel for smoke
detection in the forward or aft cargo compartment
* Compartment overheat detection controller for a wheel well
fire.
Wailer Inputs
To make the wailer sound, the aural warning module receives
discrete inputs from the digital flight control system (DFCS)
mode control panel (MCP) for the autopilot disconnect warning.
Clacker Inputs
To make the clacker sound, the aural warning module receives
discrete inputs from the left or right air data inertial reference
unit (ADIRU) for an overspeed warning.
HI Chime Inputs
To make the HI chime sound, the aural warning module
receives discrete inputs from these units:
* Capt call switch for a call from someone on the ground at the
external power panel
* Forward and aft attendant panels for a call from someone at
the attendant stations.
HI/LO Chime Inputs
To make the HI/LO chime sound, the aural warning module
receives a discrete input from the remote electronics unit.
The remote electronics unit receives a signal from these units:
* The SELCAL aural warning relay when the SELCAL decoder
senses a call from the ground station
AURAL WARNING SYSTEM - INTERFACES
EFFECTIVITY
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