TEST (CMC REF)
Equipment Cooling Smoke Detection System Simplified Schematic
Figure 2 (Sheet 2)

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E28635
A
747-400 MAINTENANCE MANUAL
 EQUIPMENT COOLING SMOKE DETECTOR - MAINTENANCE PRACTICES
________________________________________________________
 1.  General
_______
 A.  This procedure contains two tasks. The first task replaces the lamp in the equipment cooling smoke detector. The second task cleans the smoke detector.
 B.  You can get access to the smoke detector, M7931, if you remove the left wall lining panel in the forward cargo compartment at STA 581.
 C.  If there is an indication that a detector does not work correctly, do a check of the lamp before you replace the smoke detector.
 TASK 26-16-51-902-001
 2.  Replace the Smoke Detector Lamp (Fig. 201)
_______________________________
 A.  Consumable Materials
 (1) A00000 Lamp - CM376AS15
 B.  References
 (1)
26-16-51/401, Equipment Cooling Smoke Detector

 (2)
IPC 26-16-01 Fig. 05

 (3)
WDM 21-58-12

 C.  Access
 (1)  Location Zone 121 Forward Cargo Container Compartment Forward Half LH
 D.  Procedure
 S 022-002
 (1)
Remove the smoke detector (Ref 26-16-51/401).

 S 032-003

 (2)
Remove the six screws from the cover of the detector.

 (3)
Remove the detector cover.

 (4)
Remove the lens and lamp holder from the electronics assembly.

 (5)
Remove the lens and lamp holder.

 S 032-017
 S 032-004
 S 962-005
 S 962-006
 CAUTION: WHEN YOU REPLACE THE LAMP, USE ONLY ONE OF THESE LAMPS:
_______ CM376AS10, CM376AS15, GI376AS10, OR GI376AS15. IF YOU USE AN INCORRECT LAMP THE SMOKE DETECTOR WILL NOT OPERATE CORRECTLY.
 (6) Put the lamp in the lens and lamp holder.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

SEE A
COVER  (6 LOCATIONS) SCREW  COVER  SCREW (6 LOCATIONS) 
GASKET ASSEMBLY ELECTRONICS  SPARE LAMPS LAMP LAMP HOLDER LENS AND  ASSEMBLY ELECTRONICS COVER) (ATTACHED TO GASKET 
DETECTOR  DETECTOR 
A 1 SMOKE DETECTOR  A 2 SMOKE DETECTOR
2 1  SMOKE DETECTORS WITH LEDs SMOKE DETECTORS WITH REPLACEABLE LAMPS 

Equipment Cooling Smoke Detector Relamping
Figure 201

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747-400 MAINTENANCE MANUAL
 S 432-018
 (7)  Put the lens and lamp holder in the correct position in the electronics assembly.
 (a)  Tighten the lens and lamp holder.
 S 432-019
 (8)  
Put the gasket and cover on the detector.

 S 432-007

 (9)  
Install and tighten the screws to seal the detector.

 NOTE: The detector cover must be air tight.
____
 S 422-008
 (10) Install the smoke detector (Ref 26-16-51/401).
 TASK 26-16-51-102-009
 3.  Clean the Smoke Detector________________________
 A. Standard Tools and Equipment
 (1)  Compressed Air Source - Clean, filtered, dry and maximum pressure 15 psig.
　
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