D. Do a Test of the Wheel Well Fire Detection System
S 755-011
(1)
Push and hold the WHL WELL switch on the FIRE/OVHT TEST panel, M10445, on the P8 panel, and make sure these indications occur:
(a)
The discrete FIRE warning light, on the P1-3 panel, comes on.
(b)
The WHEEL WELL light, on the P3 panel, comes on.
(c)
The WHEEL WELL FIRE warning message shows on the EICAS top display.
(d)
The red MASTER WARNING lights, on the P7 panel, come on.
(e)
The fire bell is heard.
(2)
Release the switch and make sure the indications stop.
S 755-012
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S 865-013
(3)
At the electrical systems card file, P50, momentarily push the LOC TEST switch on the DUCT LEAK and WW FIRE CONTROL CARD.
S 755-014
(4)
Make sure codes 91, then 99 show on the LED display, and code 84 does not show.
E. Put the airplane back to its usual condition.
S 945-015
(1)
Close the cover on the electrical system card file, P50.
S 865-016
(2)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
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757 MAINTENANCE MANUAL
WHEEL WELL FIRE DETECTOR - REMOVAL/INSTALLATION
_______________________________________________
1. General
_______
A. Wheel well fire detectors are installed in the left and right main wheel wells. The removal and installation procedure are the same for the two units.
TASK 26-17-01-014-018
2. Remove Wheel Well Fire Detector (Fig. 401)
_______________________________
A. Equipment
(1)
Main Gear Door Locks (AMM 32-00-15/201)
(2)
Caps to fit 35303-64 connectors
(3)
Bonding Meter, AVTRON T477W
B. References
(1)
AMM 24-22-00/201 Electrical Power - Control
(2)
AMM 32-00-15/201 Landing Gear Door Locks
(3)
AMM 32-00-20/201 Landing Gear Down Locks
C. Access
(1) Location Zones 143/144 Main Landing Gear Wheel Well (left and right)
D. Procedure
S 014-017
WARNING: USE THE PROCEDURE IN AMM 32-00-15/201 TO INSTALL THE DOOR
_______ LOCKS. THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(1)
Open the doors for the landing gear and install the door locks (AMM 32-00-15/201).
S 864-001
(2)
Open these circuit breakers on the overhead panel, P11, and attach DO-NOT-CLOSE tags:
(a)
11B10, WW FIRE DETECTION
(b)
11B35, WW FIRE TEST
S 014-019
CAUTION: ALWAYS OPEN THE FIRST THREE CLAMPS FROM THE DETECTOR BEFORE YOU
_______ LOOSEN THE HEXNUT AND DISCONNECT THE CONNECTOR. THIS MUST BE DONE TO MAKE SURE YOU CAN MOVE THE DETECTOR WITHOUT APPLYING FORCE TO THE CONNECTOR PINS.
(3)
Open the first three clamps near the detector end.
S 034-002
(4)
Remove the lockwire and disconnect the connectors at the two ends of the detector.
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