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A
747-400 MAINTENANCE MANUAL
 S 865-062
 (6) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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A
747-400 MAINTENANCE MANUAL
 LAVATORY SMOKE DETECTOR - REMOVAL/INSTALLATION
______________________________________________
 1.  General_______
 A.  Two tasks are in this procedure. The first is the removal of the lavatory smoke detector and the second is the installation of the lavatory smoke detector.
 B.  A smoke detector is installed in the ceiling of each lavatory. The removal and installation procedures are the same for each smoke detector.
 TASK 26-13-01-004-001
 2.  Remove the Smoke Detector (Fig. 401)____________________________________
 A.  References
 (1)  
WDM 26-13-11 through 26-13-14

 (2)  
SSM 26-13-01 through 26-13-04

 B.  Access
 (1)  Location Zone
 211 to 274 Upper Half Fuselage

 C.  Remove the Lavatory Smoke Detector
 S 864-002
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P180 DC Power Distribution Panel
 1) 180F18 LAV SMOKE DET-1
 2) 180F03 LAV SMOKE DET-2

 S 034-003
 (2)  Loosen the two screws on the smoke detector faceplate.
 NOTE:____The screws are attached to the faceplate. Do not remove them.
 S 014-004
 (3)  Remove the faceplate from the smoke detector case.
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A 747-400 MAINTENANCE MANUAL
CEILING
BRACKET

FACE (2 LOCATIONS) PLATE
____ THE SCREWS ATTACHED TO THE FACE PLATE
NOTE:
CANNOT BE REMOVED.
Lavatory Smoke Detector Installation
Figure 401

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A 747-400 MAINTENANCE MANUAL
 (4)  S 034-005Remove the two mounting screws which attach the smoke detector case to the ceiling bracket.
 (5)  S 024-006Remove the smoke detector and the ceiling bracket from the ceiling.
 (6)  S 034-007Disconnect the electrical connector.
 (7)  S 034-008Hold the smoke detector case and disconnect the lanyard from the rear of the smoke detector case.

 TASK 26-13-01-404-009
 3. Install the Smoke Detector (Fig. 401)
_____________________________________
 A. References
 (1)  
AMM 26-13-00/501 Lavatory Smoke Detection System

 (2)  
WDM 26-13-11 through 26-13-14

 (3)  
SSM 26-13-01 through 26-13-04

 B. Access
 (1)  Location Zone
 211 to 274 Upper Half Fuselage

 C. Procedure
 S 434-010
 (1)  
Attach the lanyard from the ceiling bracket to the smoke detector case.

 S 434-011

 (2)  
Hold the ceiling bracket on top of the smoke detector and loosely tighten the two mounting screws on the smoke detector case.

 S 434-012

 (3)  
Connect the airplane wiring connector to the electrical connector on the smoke detector or case.
　
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