MD&T
MD&T
Wheel Well Fire Detection Schematic
Figure 2

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MAINTENANCE MANUAL

 B. Test
 (1)  Pressing the WHEEL WELL test switch on the M10445 fire overheat test panel disconnects and applies a ground to one end of the continuous detection loop. If there are no broken (open circuit) overheat detectors, an alarm signal is provided by the detection circuit on the duct leak overheat and wheel well fire card. The detection circuit provides an alarm signal to turn on the WHEEL WELL FIRE light on P3 and the FIRE master warning lights on P7, to initiate a warning alert from the EICAS and the WEU to generate the fire bell sound.
 C. Control
 (1)  The system is active whenever it receives electrical power from the WW FIRE DETECTION circuit breaker.
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FAULT ISOLATION/MAINT MANUAL

WHEEL WELL FIRE DETECTION
COMPONENT  FIG. 102 SHT QTY  ACCESS/AREA  REFERENCE AMM 
CARD - DUCT LEAK AND WHEEL WELL OVHT CONTROL, 2  1  119BL, MAIN EQUIP CTR, P50  26-10-01 
M691 
CARD - DUCT LEAK AND WHEEL WELL POWER SUPPLY,  2  1  119BL, MAIN EQUIP CTR, P50  26-10-01 
M10428 
CIRCUIT BREAKER - 1  FLT COMPT, P11 
W/W FIRE TEST, C4290  1  11B35  * 
W/W FIRE DET, C770 1  11B10  * 
COMPUTER - (FIM 31-41-00/101) 
EICAS L, M10181
 EICAS R, M10182
DETECTOR - WHEEL WELL OVERHEAT, TS202,TS203, 2  4  MAIN WHEEL WELLS  26-17-01 
TS204,TS205 
LIGHT - WHEEL WELL FIRE, L445 1  1  FLT COMPT, P3-1, WARNING DISPLAY * 
MODULE - DISCRETE WARNING DISPLAY, M779  2  1  FLT COMPT, P1-3, MODULE M779  * 
PANEL - (FIM 26-11-00/101) 
FIRE/OVHT TEST, M10445 
SWITCH - WHEEL WELL FIRE TEST, YQQS003 OR 2  1  FLT COMPT, P8, FIRE/OVHT TEST * 
YQQS004  PANEL, M10445 

* SEE THE WDM EQUIPMENT LIST
Wheel Well Fire Detection - Component Index
Figure 101

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E30110
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FAULT ISOLATION/MAINT MANUAL

WHEEL WELL FIRE LIGHT, L445

DISCRETE WARNING DISPLAY MODULE, M779
SEE
E SHT 2
P1-3 PANEL
PANEL, M10445 (REF) SEE
A SHT 2
FLIGHT COMPARTMENT
Wheel Well Fire Detection - Component Location
Figure 102 (Sheet 1)

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757 FAULT ISOLATION/MAINT MANUAL

ELECTRICAL SYSTEM CARD FILE, P50 DISCRETE WARNING DISPLAY MODULE, M779
E FROM SHT 1

C Wheel Well Fire Detection - Component Location Figure 102 (Sheet 2)
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