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FIRE PROTECTION - LWR CARGO COMPARTMENT SMOKE DETECTION - CARGO ELECTRONIC UNIT
EFFECTIVITY
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FIRE PROTECTION - LWR CARGO COMPARTMENT SMOKE DETECTION - CARGO ELECTRONIC UNIT
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The cargo fire control panel monitors the fire protection system
for these conditions:
* Lower cargo compartment smoke
* Lower cargo compartment overheat
* Smoke detector fault conditions
* Cargo fire extinguisher bottle squib condition
* Cargo fire extinguisher bottle discharge.
The cargo fire control panel lets you do these functions:
* Set the mode of operation (single or dual loop smoke
detector operation)
* Operate a cargo fire extinguisher bottle
* Do a test of the cargo fire extinguisher bottle squibs
* Do a test of the lower cargo fire protection system
* Do a test of the fault detection circuits.
Physical Description
These are the cargo fire control panel components:
* Amber DETECTOR FAULT light
* DET SELECT switches
* Green FWD and AFT EXT lights
* Amber DISCH switchlight (guarded)
* FWD and AFT cargo fire arm switches
* TEST push-button switch.
General Description
The DETECTOR FAULT amber light comes on if a cargo smoke
detector has a fault.
Each DET SELECT switch has these three positions:
* NORM - both detector loops are necessary to sense a smoke
or overheat condition to give a fire indication
* A - only the A loop is necessary to sense a smoke or
overheat condition for a fire indication
* B - only the B loop is necessary to sense a smoke or
overheat condition for a fire indication.
The green FWD and AFT EXT lights show extinguisher bottle
squib continuity.
The DISCH switchlight comes on when the bottle pressure is
less than 250 psi.
The TEST push button does a check of the cargo smoke
detectors and the extinguishing system.
The FWD or AFT red cargo fire lights come on if a fire indication
is given by the smoke detectors.
The ARMED light on the fire arm switches comes on when you
push the related switch. When the fire armed switch is not
pushed you can not see the word ARMED.
FIRE PROTECTION - CARGO COMPARTMENT SMOKE DETECTION - CARGO FIRE CONTROL PANEL
EFFECTIVITY
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The P7 FIRE WARN lights come on and the aural warning unit
operates if there is a cargo compartment smoke or overheat
condition.
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EFFECTIVITY
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FIRE PROTECTION - CARGO COMPARTMENT SMOKE DETECTION - CARGO FIRE CONTROL PANEL
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EFFECTIVITY
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Smoke Detection
The smoke detectors in the lower cargo compartments are
monitored by the cargo electronic units (CEUs). These units
process inputs from smoke detectors and interface with the
components in the flight compartment.
If smoke is detected in the lower cargo compartment, the
detector sends an alarm signal to the CEU. The CEU sends the
alarm signal to the cargo fire control panel.
The cargo fire control panel turns on the FWD or AFT red fire
lights and sends an alarm signal to these components:
* Cabin pressure control system
* P7 FIRE WARN lights come on
* Aural warning unit gives the bell sound.
The cargo fire control panel sends the alarm signal to the cabin
pressure control system. This signal causes the CPC to set the
cabin pressure rate of descent to 750 slfpm. This helps prevent
smoke penetration into the passenger cabin from the lower
lobe. This function is inhibited on the ground.
Functional Description
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