(1)  
Location Zone
 412 Engine 1 - HPC Fwd Case 3:30 or 9:30 o'clock
 422 Engine 2 - HPC Fwd Case 3:30 or 9:30 o'clock
 432 Engine 3 - HPC Fwd Case 3:30 or 9:30 o'clock
 442 Engine 4 - HPC Fwd Case 3:30 or 9:30 o'clock

 (2)  
Access Panel
 415 Left Thrust Reverser Half - Engine 1
 416 Right Thrust Reverser Half - Engine 1
 425 Left Thrust Reverser Half - Engine 2
 426 Right Thrust Reverser Half - Engine 2
 435 Left Thrust Reverser Half - Engine 3
 436 Right Thrust Reverser Half - Engine 4
 445 Left Thrust Reverser Half - Engine 4
 446 Right Thrust Reverser Half - Engine 4

 C.  
Prepare to Remove the Control Valves

 S 864-002-N00
 (1)  For the applicable engine, open these circuit breakers that follow and install the DO-NOT-CLOSE tags:
 (a)  P6 Main Power Distribution Panel
 1) 6G1 FUEL SHUTOFF VALVE ENG 1
 2) 6G15 SCU ALT PWR ENG 1
 3) 6G23 ENG SCU 1

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
4. RIGHT HPC SECONDARY FLOW CONTROL VALVE
SEE B
SEE A
FWD
A
5.  BOLT 
(6 LOCATIONS)  6.  EEC ELECTRICAL 
3.  GASKET  4. HPC SECONDARY  CONNECTOR 
FLOW CONTROL 
1.  BOLT  VALVE 
(3 LOCATIONS) 
2.  COVER 
(VENTED) 

7.  COOLING AIR HOSE
13.  
PLUG 8. HOSE CLAMP

9.  COVER (PLAIN) FWD

10.
GASKET

12. CAP ASSEMBLY 2
10. GASKET
1.  BOLT
11. ADAPTER  (3 LOCATIONS)
16. WASHERS 1
15. BRACKET 1
1
ENGINES WITH PW SB 73-164
2
ENGINES WITH PW SB 75-62R2
B
OR WITHOUT PW SB 75-91
HPC Secondary Flow Control Valve Installation
Figure 401 (Sheet 1)

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 ALL  ú ú N01 Page 402 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
SEE C
4. LEFT HPC SECONDARY
FLOW CONTROL VALVE SEE D
FWD
C
HPC Secondary Flow Control Valve Installation
Figure 401 (Sheet 2)

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 ALL  ú ú N01 Page 403 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
5. BOLT (6 LOCATIONS)
3.  GASKET
4.  HPC SECONDARY
1.  BOLT FLOW CONTROL VALVE
(3 LOCATIONS) 10. GASKET 12. CAP ASSEMBLY 2
11. ADAPTER
9.  COVER (PLAIN)
1.  BOLT (3 LOCATIONS)8. HOSE CLAMP 15. NUT
10. GASKET 
7. COOLING 
AIR  2. COVER 
HOSE  13. PLUG  (VENTED) 
24. NUT  FWD  NO. 3  CLAMP  1. BOLT 
5  BEARING  14. BRACKET 
BREATHER 
20. BRACKET  TUBE  16.  BOLT 
5 

21. TRIM LINE OIL TUBE
6. EEC ELECTRICAL  23. CLAMP CONNECTOR
5
22. BOLT 5
D
2
ENGINES WITH PW SB 75-62R2 OR WITHOUT PW SB 75-91
5
ENGINES WITH PW SB 79-52
HPC Secondary Flow Control Valve Installation Figure 401 (Sheet 3)
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 75-33-01
　
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