757 MAINTENANCE MANUAL
FIRE DETECTION PRINTED-CIRCUIT CARDS - REMOVAL/INSTALLATION
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1. General_______
A. The fire detection card file, P54, contains printed circuit cards which have logic functions for the e fire/overheat detection systems: engine, APU, cargo, wheel well, and duct leak. The P54 card file is in the electrical/electronic equipment compartment adjacent to the removal/installation procedure is the same for all cards.
TASK 26-10-01-024-001
2. Remove the Printed-Circuit Card (Fig._______________________________401)
A. References
(1)
AMM 20-41-01/201, Electrostatic Discharge Sensitive Devices
(2)
AMM 24-22-00/201, Electrical Power - Control
B. Remove the Printed-Circuit Card
S 864-031
(1) Open the circuit breakers on the overhead circuit breaker panel, P11, and attach DO-NOT-CLOSE tags. See Table 401 for the printed-circuit card to be removed and the applicable circuit breakers to be opened.
NOTE: All of the circuit breakers in each block must be opened.
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ALL ú ú 01 Page 401 ú Sep 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
M681
M691
M686
M685
M10400
M684
M10275
Fire Detection Printed Circuit Card Installation
Figure 401
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ALL ú ú 05 Page 402 ú Mar 15/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
~.............................................................................. | Table 401 | ................................................................................ | SYSTEM | PRINTED-CIRCUIT CARD | CIRCUIT BREAKERS | ................................................................................ | L ENGINE FIRE, | M681 - L ENG FIRE | 11A32, INDICATOR LIGHTS 1 | | L NACELLE OVHT,| LOOP 1 | 11A33, INDICATOR LIGHTS 2 | | L TURBINE OVHT,| M682 - L ENG FIRE | 11B18, WARN ELEX B | | L STRUT OVHT | LOOP 2 | 11B20, FIRE DETECTION L ENGINE 1 | | | M10229 - L NAC OVHT | 11B21, FIRE DETECTION L ENGINE 2 | | | LOOP 1 | 11J26, FIRE DET ALTN PWR ENGINE LEFT| | | M10276 - L NAC OVHT | 11J33, WARN ELEX A | | | LOOP 2 | 11P29, R IND LTS 2 | | | M10224 - AFOLTS 1 *[1]| | | | M10425 - AFOLTS 4 *[1]| | ................................................................................ | R ENGINE FIRE, | M683 - R ENG FIRE | 11A32, INDICATOR LIGHTS 1 | | R NACELLE OVHT,| LOOP 1 | 11A33, INDICATOR LIGHTS 2 | | R TURBINE OVHT,| M684 - R ENG FIRE | 11B18, WARN ELEX B | | R STRUT OVHT | LOOP 2 | 11B22, FIRE DETECTION R ENGINE 1 | | | M10230 - R NAC OVHT | 11B23, FIRE DETECTION R ENGINE 2 | | | LOOP 1 | 11J27, FIRE DET ALTN PWR ENGINE | | | | RIGHT | | | M10275 - R NAC OVHT | 11J33, WARN ELEX A | | | LOOP 2 | 11P29, R IND LTS 2 | | | M10274 - AFOLTS 2 *[1]| | | | M10426 - AFOLTS 5 *[1]| | ................................................................................ | APU FIRE | M685 - APU LOOP 1 | 11A32, INDICATOR LIGHTS 1 | | | M686 - APU LOOP 2 | 11A35, INDICATOR LIGHTS 4 | | | M10400 - AFOLTS 3 *[1]| 11B18, WARN ELEX B | | | | 11B24, FIRE DETECTION APU 1 | | | | 11B25, FIRE DETECTION APU 2 | | | | 11J25, FIRE DET ALTN PWR APU | | | | 11J33, WARN ELEX A | | | | 11P29, R IND LTS 2 | ................................................................................
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