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A 747-400 MAINTENANCE MANUAL
 (4)  S 424-013Put the smoke detector into the ceiling and push on the screws until the ceiling bracket clicks into position.
 (5)  S 434-014Tighten the screws which hold the ceiling bracket into position.
 (6)  S 414-015Install the faceplate on the smoke detector and tighten the faceplate screws.
 (7)  S 864-016Close these circuit breakers and remove DO-NOT-CLOSE tags: (a) P180 DC Power Distribution Panel 1) 180F18 LAV SMOKE DET-1 2) 180F03 LAV SMOKE DET-2
 (8)  S 734-022Do the System Lavatory Smoke Detection Test (Ref 26-13-00/501).

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A
747-400 MAINTENANCE MANUAL
 LAVATORY SMOKE DETECTOR - CLEANING/PAINTING
___________________________________________
 1.  General_______
 A.  This section has a procedure to clean the smoke detectors.
 B.  A smoke detector is installed in the ceiling of each lavatory. The procedure is applicable to all of the lavatory smoke detectors.
 TASK 26-13-01-107-001
 2.  Clean the Smoke Detector (Fig. 701)___________________________________
 A.  Standard Tools and Equipment
 (1)  
Compressed air source

 (2)  
Nylon Brush

 (3)  
Lint-Free cloth

 (4)  
Luke-warm water

 (5)  
Standard Screwdriver

 B.  Consumable Materials
 (1)  B00158 Detergent
 C.  References
 (1)  
AMM 26-13-00/501, Lavatory Smoke Detection System

 (2)  
AMM 26-13-01/401, Lavatory Smoke Detector

 (3)  
WDM 26-13-11 through 26-13-14

 (4)  
SSM 26-13-01 through 26-13-04

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

 E.  Clean the Smoke Detector
 S 147-043
 (1)  
Remove the dust from the external surfaces of the unit. Use a nylon bristle brush. Finish with a dry, lint-free cloth.

 (2)  
Remove the detector assembly (Ref 26-13-01/401).

 S 037-014

 (3)  
Remove the two faceplate screws which hold the faceplate to the smoke detector assembly.

 (4)  
Remove the faceplate from the smoke detector assembly.

 (5)
Push the lock release mechanism in the smoke detector assembly.

 (6)  
Remove the smoke sensor from the smoke detector assembly.

 S 037-003
 S 017-015
 S 867-016
 S 027-017
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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 701

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747-400 MAINTENANCE MANUAL
SENSOR - SMOKE DETECTOR
SEE A
PULL
OUT

SENSOR - SMOKE DETECTOR
　
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