S 864-014

 (2)
Close these circuit breakers and remove DO-NOT-CLOSE identifiers:

 (a)  P7 Overhead Circuit Breaker Panel
 1) 7H16 CARGO SMOKE - MAIN DECK ZN 1-8 A

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 2) 3) 4)  7H17 CARGO SMOKE - MAIN DECK ZN 1-8 B7H18 CARGO SMOKE - MAIN DECK ZN 9-16 A7H19 CARGO SMOKE - MAIN DECK ZN 9-16 B
 (3)  S 714-017Do the operational test (AMM 26-14-00/501).
 (4)  S 864-018Remove electrical power.  (AMM 24-22-00/201).

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747-400
MAINTENANCE MANUAL

 SMOKE DETECTOR - CLEANING/PAINTING
__________________________________
 1.  General
_______
 A.  This procedure applies to all of the smoke detectors in the main cargo compartment.
 B.  There are thirty two smoke detectors in the main cargo compartment.
 TASK 26-14-01-107-001
 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)  
26-14-00/501, Main Deck Cargo Compartment Smoke Detection System

 (2)  
26-14-01/401, Smoke Detector

 (3)  
IPC 26-14-01 Fig.1

 (4)  
WDM 26-16-21 thru 26-16-29

 D.  Access
 (1)  Location Zone 231 Passenger Cabin First to Second Door, LH 241 Passenger Cabin Second to Third Door, LH 251 Passenger Cabin Third to Fourth Door, LH 261 Passenger Cabin Fourth Door to STA 2040, LH 271 Passenger Cabin STA 2040 to STA 2360, LH
 E.  Procedure
 S 027-002
 (1)  
Remove the detector (Ref 26-14-01/401).

 S 217-003

 (2)  
Examine the smoke detector chamber internally for any unwanted material such as dirt, dust, insects or residue on the walls of the chamber. Contamination can cause a false alarm or change the detector sensitivity.

 S 167-004

 (3)  
Blow out contamination with dry compressed air at maximum gage pressure of 15 psig.

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747-400 MAINTENANCE MANUAL
FORWARD MID
AFT
13
ZONE 1
2 3 4 5 6 7
8 9
10 11 12 14 15 16
TWO SMOKE DETECTORS IN EACH ZONE
FWD
SEE A

MAIN DECK CARGO COMPARTMENT
SCREW COVER (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
A1  A2
1
SMOKE DETECTORS WITH REPLACEABLE LAMPS
2
SMOKE DETECTORS WITH LEDs
　
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