757
MAINTENANCE MANUAL

SEE  A 
SEE  C 
SEE  B 
INBD FWD  A 
CONNECTORS DETECTOR  DETECTOR CONNECTOR C 

SEE D
FWD B SENS0R CLAMP (EXAMPLE) D
Wheel Well Fire Detector Installation Figure 401
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 26-17-01
 ALL  ú ú 01 Page 402 ú May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 S 434-003
 (5)
Install protective caps on the aircraft electrical connectors.

 S 014-004

 (6)  
Open the remaining clamps and remove the detector.

 TASK 26-17-01-414-005
 3.  Install 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 014-020
 CAUTION: SHAPE THE DETECTOR ELEMENT SO THAT IT WILL BE CLEAR OF ADJACENT
_______ PARTS AND STRUCTURE BY AT LEAST 0.5 INCH (1.27 CM). THE MINIMUM RADIUS FOR A BEND IS 1 INCH (2.54 CM). DO NOT MAKE BENDS LESS THAN 1 INCH FROM CLAMPS OR FLANGE ASSEMBLIES. THESE PRECAUTIONS WILL PREVENT DAMAGE TO THE DETECTOR ELEMENT.
 (1)  Remove the protective caps and connect the two ends of new detector to the airplane connectors.
 (a)  Tighten the connectors to 50-60 pound-inches.
 S 414-006
 (2)  
Install new grommets over the detector and place the detector into the clamps nearest to the connectors.

 S 284-007

 (3)  
Make sure the grommets are centered in the clamps and secure the clamps.

 S 724-008

 (4)  
Do steps 3 and 4 for the remaining clamps. Work towards the center of the detector.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 S 284-009
 (5)  
Make sure that the resistance between the connector shell of the detector and the primary airplane structure is not more than 0.004 ohm. If the resistance is more than 0.004 ohm, clean the bonding surfaces and do the check again.

 S 434-010

 (6)  
Put lockwire on the connectors.

 S 864-011

 (7)  
Remove the DO-NOT-CLOSE tags and close these P11 panel circuit breakers:

 (a)  
11B10, WW FIRE DETECTION

 (b)  
11B35, WW FIRE TEST

 E. Test the Wheel Well Fire Detector Installation
 S 864-012
 (1)  
Supply electrical power (AMM 24-22-00).

 S 984-013

 (2)  
Push and hold the WHL WELL test switch on the FIRE/OVHT TEST panel, M10445.

 S 284-014

 (3)  
Make sure that the red WHEEL WELL fire light, on the P3-1 panel, is on.

 S 984-015

 (4)  
Release the WHL WELL test switch and make sure that the WHEEL WELL fire light goes off.

 S 014-021
 WARNING: USE THE PROCEDURE IN AMM 32-00-15/201 TO REMOVE THE DOOR LOCKS.
_______ THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (5)  
Remove the door locks from the landing gear doors and close the doors (AMM 32-00-15/201).

 (6)
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 864-016
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