21-51-00
 ALL  ú ú 01 Page 603 ú Oct 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 FLOW CONTROL AND SHUTOFF VALVE - REMOVAL/INSTALLATION
_____________________________________________________
 1.  General_______
 A.  This procedure has instructions to remove and install the flow control and shutoff valves. A flow control and shutoff valve is installed aft of each air cooling pack.
 TASK 21-51-01-004-001
 2.  Flow Control and Shutoff Valve Removal (Fig. 401)______________________________________
 A.  References
 (1)  
AMM 06-09-03/201, Body Section 44 Access Doors and Panels

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

 (3)  
AIPC 21-51-00 Fig. 5

 (4)  
AIPC 21-51-00 Fig. 5A

 (5)  
AIPC 21-51-00 Fig. 6

 (6)  
AIPC 21-51-00 Fig. 6A

 (7)  
AIPC 21-51-00 Fig. 7

 (8)  
AIPC 21-51-00 Fig. 7A

 (9)  
WDM 21-51-11, 21-51-12, 21-51-13

 (10)
 SSM 21-51-01

 B.  Access
 (1)  
Location Zone
 133 Air Conditioning Equipment Bay, LH
 134 Air Conditioning Equipment Bay, RH

 (2)  
Access Panel
 191H-L Air Conditioning Access Door
 191N-L Air Conditioning Access Door
 192H-R Air Conditioning Access Door

 C.  Prepare for the Removal
 S 864-002
 (1) Release the pressure in the pneumatic system (AMM 36-00-00/201).
 (a)  Make sure the DUCT PSI L and R, on the EICAS ECS synoptic display, are less than 0.50.
 S 864-030
 (2)  Turn the applicable PACK selector, on the overhead panel, P5, to the OFF position.
 (a)  Put a DO-NOT-OPERATE tag on the selector.
 S 014-003
 (3)  Open the applicable access door (AMM 06-09-03/201):
 (a)  191H-L for pack 1.
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 21-51-01
 ALL  ú ú 02 Page 401 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

PACK 2 FLOW CONTROL PACK 1 FLOW CONTROL AND SHUTOFF VALVE AND SHUTOFF VALVE
SEE A SEE A
ELECTRICAL A
CONNECTOR
A
PACK 3BONDING FLOW CONTROLJUMPERS
AND SHUTOFF FWD VALVE
SEE A
AIR CONDITIONING EQUIPMENT BAY
FLOW CONTROL SEE BAND SHUTOFF VALVE
SEE B
A
MANUAL ARM (SHOWN OVERRIDE IN CLOSEDV-BAND CLAMP POSITION)
DUCT
SEAL ASSEMBLY
B
A-A
Flow Control and Shutoff Valve Installation
Figure 401

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 21-51-01
 ALL  ú ú 01 Page 402 ú Oct 10/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b)
191N-L for pack 2.

 (c)
192H-R for pack 3.

 D. Remove the Valve
 S 034-005
 (1)
Disconnect the electrical connector from the valve.

 S 034-006

 (2)
Remove the bonding jumpers from the valve.

 S 034-009

 (3)
Remove the clamps from each end of valve.

 NOTE: You can use a plastic mallet to loosen the clamp.
____
 S 024-010
 (4)
Remove the valve.

 S 434-026

 (5)
Put a cover on the duct openings.

 TASK 21-51-01-404-011
 3. Flow Control and Shutoff Valve Installation (Fig. 401)
___________________________________________
 A. References
 (1)
AMM 06-09-03/201, Body Section 44 Access Doors and Panels

 (2)
AMM 20-11-14/701, Metal Surfaces - Cleaning/Painting

 (3)
AMM 20-22-01/601, Electrical Bonding

 (4)
AMM 24-22-00/201, Manual Control

 (5)
AMM 36-00-00/201, Pneumatic System

 (6)
AIPC 21-51-00 Fig. 5
　
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