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A 737-300/400/500MAINTENANCE MANUAL
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A
B
CDE
F
G
HJ
KL
MN
PR
M279 FIRE DETECTOR ACCESSORY DETECTION
Engine Fire Detection System Simplified SchematicFigure 2 (Sheet 2)
A 737-300/400/500MAINTENANCE MANUAL
L345 FIRE WARN LT (P7)
OUTPUT M279 FIRE DET
M469 ANNUN
ACCESSORY UNIT (E3-3)
& DIM MODULE (P9)
MASTER FIRE/OVHT WARNING
Engine Fire Detection System Simplified Schematic
Figure 2 (Sheet 3)
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737-300/400/500MAINTENANCE MANUAL
C. The accessory control card configures the signals from each detector in AND-logic and determines the appropriate output. See Table 1.
~.............................................................................. | INDICATION - BOTH LOOPS OPERATIVE. | ................................................................................ | LOOP A | ................................................................................ | | | | | | | POWER | | | CONDITION | FIRE | OVHT | NORMAL | FAULT | FAILURE | ................................................................................ | | | FIRE | | | FIRE | | | | FIRE | OVHT | OVHT | NONE | OVHT | FAULT | | ......................................................................... |LOOP B| OVHT | OVHT | OVHT | NONE | OVHT | FAULT | | ......................................................................... | | NORMAL | NONE | NONE | NONE | NONE | FAULT | | ......................................................................... | | | FIRE | | | | | | | FAULT | OVHT | OVHT | NONE | FAULT | FAULT | | ......................................................................... | | POWER | | | | | | | | FAILURE | FAULT | FAULT | FAULT | FAULT | FAULT | 2..................…...........…...........…...........…...........…............ | INDICATION - SINGLE LOOP OPERATIVE (A OR B) | ......................................................................... | | | | | | POWER | | CONDITION | FIRE | OVHT | NORMAL | FAULT | FAILURE | ........................................................................| | | FIRE | | | | | | INDICATION| OVHT | OVHT | NONE | FAULT | FAULT | 2...........…...........…...........…...........…...........…...........1
TABLE I AND-Logic Fire/Overheat System Truth Table
D. A fire is indicated as follows:
(1)
The appropriate (engine 1 or engine 2) fire switch handle on the P8 control stand illuminates and unlocks.
(2)
The master FIRE WARN lights on lightshield panel P7 illuminate.
(3)
The fire bell sounds.
E. An overheat is indicated as follows:
(1)
The appropriate engine overheat light - ENG 1 or ENG 2 OVERHEAT - on the P8 control stand illuminates.
(2)
The master CAUTION and OVHT/DET lights on lightshield panel P7 illuminate.
F. A fault is indicated as follows:
(1) The FAULT light on the P8 control stand illuminates.
G. The bell may be silenced and FIRE WARN lights may be extinguished by pressing either FIRE WARN light or the BELL CUTOUT switch.
H. The master CAUTION and OVHT/DET lights may be extinguished by pressing either CAUTION light.
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737-300/400/500MAINTENANCE MANUAL
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