C82034
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 034-021
 (4)  
Disconnect electrical connector DS2276 (fwd)/DS2277 (aft) of the fwd/aft pressure switches.

 S 034-006

 (5)  
Disconnect the vacuum sense line from the ejector to the pressure switch.

 S 034-007

 (6)  
Remove the four mounting screws on the switch.

 S 024-008

 (7)  
Remove the pressure switch.

 TASK 26-14-04-404-009
 3. Install Pressure Switch (Fig. 401)
_______________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 36-00-00/201, Pneumatic Systems

 (3)  
AIPC 26-14-51 Fig. 1

 (4)  
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 424-010
 CAUTION: EAR PROTECTION MUST BE WORN IN THE AFT CARGO COMPARTMENT
_______ BECAUSE OF THE HIGH NOISE LEVEL OF THE EJECTOR.
 (1)  
Install pressure switch S2276 (fwd)/S2277 (aft) on the mounting brackets.

 (2)  
Install the four mounting screws on the switch.

 S 434-023

 (3)  
Connect electrical connector DS2276 (fwd)/D2277 (aft) of the presssure switch.

 (4)  
Connect the vacuum sense line.

 S 434-011
 S 434-013
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747-400 MAINTENANCE MANUAL
 (5)  S 864-014Close these circuit breakers and remove the DO-NOT-REMOVE 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
 (6)  S 864-015Pressurize the pneumatic crossover duct (AMM 36-00-00/201).
 (7)  S 864-016Make sure that the pneumatic crossover duct is pressurized.
 (8)  S 794-017Examine the plumbing connections and the ejector for air leaks.
 (9)  S 714-001Do the operational test (AMM 26-14-00/501).
 S 864-018

 (10) Remove electrical and pneumatic power. (AMM 24-22-00/201, AMM 36-00-00/201).
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747-400 MAINTENANCE MANUAL
 MAIN DECK CARGO COMPARTMENT SMOKE DETECTION TUBING - INSPECTION/CHECK
_____________________________________________________________________
 1.  General_______
 A.  This section contains an inspection/check procedure of the tubing manifolds of the smoke detection system in the cargo compartment on the main deck.
 B.  Access to the tubing is through the cargo compartment on the main deck.
 TASK 26-14-05-706-008
 2.  Smoke Sampling Manifold Check_____________________________
 A.  Reference
 (1)  IPC 26-14-53 Fig. 01
 B.  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
　
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