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747-400
MAINTENANCE MANUAL

 SMOKE DETECTOR - CLEANING/PAINTING
__________________________________
 1.  General
_______
 A.  There are eight smoke detectors in the forward lower cargo compartment. There are eight more smoke detectors in the aft lower cargo compartment.
 B.  The procedure applies to all smoke detectors in the lower cargo
 compartment.

 TASK 26-16-01-107-001
 2.  Clean the Smoke Detector (Fig. 701)
________________________
 A.  Standard Tools and Equipment
 (1)  
Compressed Air Source - Clean, filtered, dry and maximum pressure 15 psig

 (2)  
Brush - Soft Bristle

 B.  Consumable Materials
 (1)  
B00090 Solvent - Trichloroethane 1:1:1, MIL-T-81533

 (2)  
Paint Touch-Up P/N 2600-08 or 6400-4444
 Cardinal Industrial Finishes
 890 Commercial Street
 San Jose, CA 95112
 FAX: (408) 452-0318
 PHONE: (800) 998-9847

 C.  References
 (1)  
AMM 26-16-00/501, Lower Cargo Compartment Smoke Detection System

 (2)  
IPC 26-16-01, FIG.1

 (3)  
IPC 26-16-01, FIG.2

 (4)  
WDM 26-16-11 THRU WDM 26-16-16

 D.  Access
 (1)  Location Zones 122 Forward Cargo Container Compartment Forward Half R.H. 142 Aft Cargo Compartment R.H.
 E.  Procedure
 S 027-002
 (1)  
Remove the detector cover.

 S 217-003

 (2)  
Do a check on the inner surface of the smoke detector cell for insects, dirt or water.

 NOTE: Such contamination can cause an incorrect failure indication.
____
 S 167-004
 (3)  Blow out the contamination with the dry compressed air with the pressure less than 15 psig.
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MAINTENANCE MANUAL

2 SMOKE DETECTORS
2 SMOKE DETECTORS
EACH ZONE (QTY 8)
EACH ZONE (QTY 8)
SEE A
SEE A
COVER  SCREW 
(6 LOCATIONS) 
COVER 
SCREW 
(6 LOCATIONS) 
GASKET  GASKET
(ATTACHED TO 
COVER) 
ELECTRONICS  LENS AND  ELECTRONICS 
ASSEMBLY  LAMP HOLDER  ASSEMBLY 
LAMP 
SPARE LAMPS 
DETECTOR 
DETECTOR 
CARGO COMPARTMENT SMOKE DETECTOR  CARGO COMPARTMENT SMOKE DETECTOR 
(WITH REPLACEABLE LAMPS)  (WITH LEDs) 
A  A 

Smoke Detector Cleaning
Figure 701

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747-400 MAINTENANCE MANUAL
 (4)  S 167-013If water is present, dry the detector with warm, dry air.
 (5)  S 147-005Remove the contamination found on the smoke detector wall with a soft bristle brush.
 S 117-006

 WARNING:_______DO NOT BREATHE THE GAS FROM THE SOLVENT. USE RESPIRATORY EQUIPMENT FOR PROTECTION IF IT IS NECESSARY. MAKE SURE THERE IS A GOOD FLOW OF AIR IN THE AREA. DO NOT GET THE SOLVENT IN YOUR EYES, ON YOUR SKIN, OR ON YOUR CLOTHING. KEEP SOURCES OF IGNITION AWAY FROM THE AREA. THE SOLVENTS ARE POISONOUS AND FLAMMABLE AND CAN CAUSE INJURY TO PERSONS.
 CAUTION: DO NOT PERMIT THE SOLVENTS TO TOUCH PLASTICS, CONTROL CABLES,
_______ LUBRICATED AREAS, DECALS, OR PAINTS. THE SOLVENTS CAN CAUSE DAMAGE.
 (6)  
Clean the smoke detector wall with solvent trichloroethane 1:1:1 or naphtha.

 S 217-007

 (7)  
Do a check on the inner surface of the smoke detectors for scratches or shiny areas.
　
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