S 217-011

 (8)  
Make sure the smoke detector cell is clean and dry.

 S 867-012

 (9)  
If the smoke detector has scratches or shiny areas, apply a layer of the paint, 2600-08.

 S 377-008

 (10)
 Paint other areas of the smoke detector cell with the paint if it is necessary.

 S 217-009

 (11)
 Make sure there is no damage to the cover gasket before you install the cover.

 (12)
 Install the smoke detector cover.

 S 917-014

 (13)
 Do the operational test of the lower compartment cargo smoke detection system (AMM 26-16-00/501).

 S 427-010
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MAINTENANCE MANUAL

 SMOKE DETECTOR EJECTOR - REMOVAL/INSTALLATION
_____________________________________________
 1.  General
_______
 A.  This procedure contains two tasks. The first removes the venturi ejector in the lower cargo compartment. The second task installs the venturi ejector in the lower cargo compartment.
 B.  A venturi ejector is installed in the fwd lower cargo compartment at STA 970 and another one in the aft lower cargo compartment at STA 1530. You can get access to the fwd ejector through the fwd lower cargo compartment and to the aft ejector through the aft lower cargo compartment.
 TASK 26-16-02-004-001
 2.  Remove the Ejector (Fig. 401)
__________________
 A.  References
 (1)  
AMM 36-00-00/201, Pneumatic Systems

 (2)  
AIPC 26-16-05, Fig. 1

 (3)  
WDM 26-16-11 thru WDM 26-16-16

 B.  Access
 (1)  Location Zones
 Fwd ejector
 125 Area Below Aft Cargo Container Compartment L.H.
 126 Area Below Aft Cargo Container Compartment R.H.
 Aft ejector
 143 Area Below Aft Cargo Container Compartment L.H.
 144 Area Below Aft Cargo Container Compartment R.H.

 C.  Procedure
 S 864-002
 (1)  Open these circuit breakers on the overhead circuit breaker panel, P7, and attach DO-NOT-CLOSE tags:
 (a)  
7H14, CARGO SMOKE DET, LWR A

 (b)  
7H15, CARGO SMOKE DET, LWR B

 S 864-003
 (2)  Release the pressure from the pneumatic crossover duct (AMM 36-00-00/201).
 S 014-004
 WARNING:_______USE EAR PROTECTION IN THE AFT CARGO COMPARTMENT. THE HIGH NOISE LEVEL OF THE EJECTOR CAN CAUSE INJURY TO PERSONS.
 (3)  Remove the middle floor panel in the fwd lower cargo compartment at STA 970 to gain access to the S2275 fwd ejector or in the aft lower cargo compartment at STA 1490 to gain access to the S2259 aft ejector.
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747-400
MAINTENANCE MANUAL

SMOKE DETECTOR  SMOKE DETECTOR 
PRESSURE SWITCH, S2259  PRESSURE SWITCH, S2275 
SEE  A  SEE  A 
VACUUM 
SENSE 
LINE 

PRESSURE SUPPLY LINE
MANIFOLD
FWD (4 LOCATIONS)EJECTOR (4 LOCATIONS) MOUNTING PLATE

Smoke Detector Ejector Installation
Figure 401

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 S 434-031
 (4)  
Disconnect the electrical connector, DS2275 (fwd ejector) or DS2259 (aft ejector), on the pressure switch.

 S 034-006
　
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