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There are four smoke detectors (two in loop A and two in loop
B) in the forward cargo compartment. Red LED lights on the
front of the CEU labeled 1A, 1B, 2A and 2B connect to smoke
detectors. The remaining LED lights are active and connect
externally by a jumper cable loop.
There are six smoke detectors (three in loop A and three in loop
B) in the aft cargo compartment. Red LED lights on the front of
the CEU labeled 1A, 1B, 2A, 2B, 3A and 3B connect to smoke
detectors. The remaining LED lights are active and connect
externally by a jumper cable loop.
Fault Detection
If a detector does not operate, the CEU sends the fault signal to
the cargo fire control panel.
The DETECTOR FAULT amber light comes on for a fault
indication.
BITE
You can test the smoke detection system with the cargo fire
control panel or the cargo electronic units.
FIRE PROTECTION - CARGO COMPARTMENT SMOKE DETECTION - FUNCTIONAL DESCRIPTION - LOWER DECK
EFFECTIVITY
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FIRE PROTECTION - CARGO COMPARTMENT SMOKE DETECTION - FUNCTIONAL DESCRIPTION - LOWER DECK
FIRE PROTECTION - CARGO COMPARTMENT SMOKE DETECTION - FUNCTIONAL DESCRIPTION - LOWER DECK
EFFECTIVITY
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General
The cargo smoke detection system uses these components:
* Cargo fire control panel
* Two cargo electronic units (CEUs)
* Smoke detectors.
Cargo Electronic Unit Test
These are the indications if you push the LAMP TEST or PRESS
TO TEST buttons:
* LAMP TEST, all 16 red lights come on
* PRESS TO TEST, all 16 red lights come on.
At the same time, these show on the cargo fire control panel:
* The EXT FWD and EXT AFT green lights come on
* FWD and AFT red switchlights come on
* DISCH amber light comes on.
If there is a fault, one or more of the red lights do not come on.
Cargo Fire Control Panel Test
These are the indications when you push the TEST button on the
cargo fire control panel:
* EXT FWD and EXT AFT green lights come on
* FWD and AFT red switchlights come on
* DISCH amber light come son
* P7 FIRE WARN lights come on
* Aural warning unit gives the bell sound.
At the same time, the 16 red lights on the CEU come on.
If there is a fault, the DETECTOR FAULT light comes on.
Training Information Point
This table shows when the DETECTOR FAULT light comes on
automatically.
STATUS DET SELECT SWITCH DETECTOR FAULT LIGHT
Loop A and B fail NORMAL ON
Loop A fail A ON
Loop B fail B ON
FIRE PROTECTION - CARGO COMPARTMENT SMOKE DETECTION - SMOKE DETECTOR TEST
EFFECTIVITY
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FIRE PROTECTION - CARGO COMPARTMENT SMOKE DETECTION - SMOKE DETECTOR TEST
FIRE PROTECTION - CARGO COMPARTMENT SMOKE DETECTION - SMOKE DETECTOR TEST
EFFECTIVITY
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26-17-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The wheel well fire detection system uses overheat sensing
elements in the main wheel well. It monitors the wheel well for
fire condition. When the system senses a fire condition, alarm
indications operate in the flight compartment. The indications
are on the glareshield panel P7 and on the engine and APU fire
control panel P8. A bell also operates in the flight compartment.
FIRE PROTECTION - WHEEL WELL OVERHEAT DETECTION - INTRODUCTION
EFFECTIVITY
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FIRE PROTECTION - WHEEL WELL OVERHEAT DETECTION - INTRODUCTION
FIRE PROTECTION - WHEEL WELL OVERHEAT DETECTION - INTRODUCTION
EFFECTIVITY
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