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 D.  When the ground test is initiated, the CMC outputs five simultaneous test initiating signals which activate five test relays. These test relays send various discrete signals to the fire detection card file. From these inputs, the fire detection card file generates fire, overheat, and fault detection discretes which it sends to the EIUs and MAWEA. The MAWEA sends signals received from the fire detection card file to the CMC on an ARINC 429 bus, and the MAWEA also sends signals received from the fire detecteion card file to the EIUs or two ARINC 429 buses. While the test is in progress, the CMC monitors all fire detection system interf aces to the EIUs and the MAWEA. If the CMC detects an inoperative interface, it displays an appropriate fault message.
 E.  The test relays can also be activated by pressing FIRE/OVHT test switch on the M7317 (P5) miscellaneous switching panel, but the test initiated by the CMC is more effective at isolating failures. The FIRE/OVHT test switch on M7317 tests critical wiring paths, while the CMC tests all wiring paths and isolates to the failed interface with a text message.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
FAULT ISOLATION/MAINT MANUAL

WHEEL WELL OVERHEAT DETECTION SYSTEM
COMPONENT SHT 102 FIG.  QTY  ACCESS/AREA  REFERENCE 
MAWEA, M7952CARD FILE - (REF 31-51-00, FIG. 101) CARD - WHEEL WELL OVHT DET, YLPA24  1  1  FIRE DETECTION CARD FILE, M826LEFT OF NOSE GEAR WHEEL WELL,  26-10-01 
CIRCUIT BREAKER - 1 FLT COMPT, P6 
W/W FIRE DET AC, C453  1  6C7  * 
DETECTOR - LEFT BODY WHEEL WELL, M691  2  1  137, BODY LANDING GEAR WELL LH  26-17-02 
DETECTOR - LEFT WING WHEEL WELL, M692  2  1  135, WING LANDING GEAR WELL LH  26-17-02 
DETECTOR - RIGHT BODY WHEEL WELL, M694  2  1  138, BODY LANDING GEAR WELL RH  26-17-02 
FIRE/OVHT TEST 1, R8048 ENABLE 3, R8055 DETECTOR - RIGHT WING WHEEL WELL, M693 MODULE - (REF 26-11-00, FIG. 101) MISCELLANEOUS SWITCHING, M7317 RELAY - (REF 31-01-36, FIG. 101)  2  1  136, WING LANDING GEAR WELL LH  26-17-02 
SWITCH - FIRE/OVHT TEST (S1) UNIT - (REF 31-61-00, FIG. 101) R EFIS/EICAS INTERFACE, M7351 C EFIS/EICAS INTERFACE, M7352 L EFIS/EICAS INTERFACE, M7353  1 1  SWITCHING MODULE, M7317 FLT COMPT, P5, MISCELLANEOUS  * 

* SEE WDM EQUIPMENT LIST
Wheel Well Overheat Detection System - Component Index
Figure 101

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A

747-400 FAULT ISOLATION/MAINT MANUAL
MISCELLANEOUS SWITCHING MODULE, M7317 (REF)
SEE A
EICAS
FIRE DETECTION CARD FILE, M826 (REF)
SEE B P6
FLT COMPT MAIN EQUIP CTR
FIRE/OVHT FIRE/OVHT
TEST SWITCH, (S1)
TEST
MISCELLANEOUS SWITCHING MODULE, M7317 (REF)
A  CARD WHEEL WELL OVHT DET, YLPA24
A1 A2 A3 A4 A5 A6 A7 A8 A9 A10A11A12A13A14A15A16A17A18A19A20A21A22A23A24A25A26A27A28A29A30A31A32A33A34A35
FIRE DETECTION CARD FILE, M826 (REF) B Wheel Well Overheat Detection System - Component Location Figure 102 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
FAULT ISOLATION/MAINT MANUAL

BODY GEAR
WHEEL WELL

SEE C
LEFT AND RIGHT WING WHEEL WELL DETECTOR, M691,M694
SEE D
FWD
LEFT AND RIGHT WING WHEEL WELL DETECTOR, M692,M693
INBD SEE E
BODY GEAR WHEEL WELL C
SCREW
GROMMET
SENSING
ELEMENT

FLANGECLAMP ASSEMBLY
SENSING
BODY WHEEL WELL FIRE DETECTOR
　
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