26-14-02
 ALL  ú ú 04 Page 404 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 6) 7H19 CARGO SMOKE - MAIN DECK ZN 9-16 B
 (7)  S 864-018Supply electrical power (AMM 24-22-00/201).
 (8)  S 864-019Supply pressure to the pneumatic crossover duct (AMM 36-00-00/201).
 (9)  S 864-020Make sure the pneumatic crossover duct is pressurized.
 S 794-021

 (10)
 Examine tube connections and ejector for air leaks.

 S 714-001

 (11)
 Do the operational test (AMM 26-14-00/501).

 S 864-022

 (12)
 Remove electrical and pneumatic power.  (AMM 24-22-00/201, AMM 36-00-00/201).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 26-14-02
 ALL  ú ú 04 Page 405 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 SMOKE DETECTOR PRESSURE SWITCH - REMOVAL/INSTALLATION
_____________________________________________________
 1.  General
_______
 A.  Two tasks are given in this section. The first is the removal of the pressure switch S2276(fwd ejector)/ S2277(aft ejector) connected to the venturi ejector in the fwd / aft lower cargo compartment respectively. The second is the installation of the pressure switches in the fwd/ aft lower cargo compartment.
 B.  Pressure switches S2276(fwd) and S2277 (aft) are directly connected to the venturi ejectors and are in the lower cargo compartment. Follow the procedure for the removal and installation of the pressure switch.
 TASK 26-14-04-004-002
 2.  Remove Pressure Switch (Fig. 401)
______________________
 A.  References
 (1)  
AMM 36-00-00/201, Pneumatic Systems

 (2)  
AIPC 26-14-51 Fig. 1

 (3)  
WDM 26-16-21 thru WDM 26-16-29

 B.  Access
 (1)  Location Zone 123 Area Below Fwd Cargo Container Compartment L.H. 124 Area Below Fwd Cargo Container Compartment R.H. 143 Area Below Aft Cargo Container Compartment L.H. 144 Area Below Aft Cargo Container Compartment R.H.
 C.  Procedure
 S 864-019
 (1) Open these circuit breakers and attach DO-NOT-CLOSE identifiers:
 (a)  P7 Overhead Circuit Breaker Panel 1) 7H16 CARGO SMOKE - MAIN DECK ZN 1-8 A 2) 7H17 CARGO SMOKE - MAIN DECK ZN 1-8 B 3) 7H18 CARGO SMOKE - MAIN DECK ZN 9-16 A 4) 7H19 CARGO SMOKE - MAIN DECK ZN 9-16 B
 S 864-003
 (2)  Remove pressure from the pneumatic crossover duct
 (AMM 36-00-00/201).

 S 014-004
 CAUTION: EAR PROTECTION MUST BE WORN IN THE CARGO COMPARTMENT BECAUSE OF
_______
 THE HIGH NOISE LEVEL OF THE EJECTOR.

 (3)  To get to the S2276 (fwd) ejector, remove the floor panel at the aft end of the lower cargo compartment at STA 950, at the center of the airplane. To get to the S2277 (aft) ejector, remove the floor panel at the aft end of the lower cargo compartment at STA 1550, at the center of the airplane.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 26-14-04
 ALL  ú ú 06 Page 401 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
FORWARD
MID
AFT
FWD
13
ZONE 1

2 3
4
5 6 7
8 9
10 11 14 15 16
12
VENTURI EJECTORS
SMOKE DETECTOR (32)
SEE A

VENTURI EJECTOR
MAIN DECK CARGO COMPARTMENT
LOWER CARGO
COMPARTMENT
FLOOR PANEL

MAIN VACUUM
MANIFOLD

PRESSURE
SUPPLY LINE

FWD  VENTURI
VENTURI EJECTOR
EJECTOR
SEE B
PRESSURE SWITCH PRESSURE
PRESSURESUPPLY LINE
A  SWITCH ELECTRICAL CONNECTOR
　
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