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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
 (2)  S 024-061Do these steps to remove the P-Clamps: (a) Remove the nut and washer that hold the P-Clamp to the valve actuator.
 NOTE:____ Keep the nut and the washer for the installation.
 (b)  Remove the P-Clamp and the spacers from the valve actuator.
 NOTE:____ Keep the P-Clamp on the wires for the installation. Keep the spacers for the installation.
 (c) (d)  Remove and discard the lockwire from the bolt that holds the P-Clamp to the valve heat shield (AMM 20-11-28/401).Remove the bolt and the washer that hold the P-Clamp to the valve heat shield.
 NOTE:____ Valve PNs 790270-1 through -12 have a long bolt that goes through a spacer under the heat shield. Hold the spacer while you remove the bolt to prevent dislocating the spacer. Newer valves have a short bolt that screws into a threaded spacer under the heat shield.
 (e)  Remove the P-Clamp from the valve heat shield.
 NOTE:____ Keep the P-Clamp on the wires for the installation.
 (3)  S 034-045Attach a tag to the wires from the terminal block on the HPSOV (1).
 (4)  S 034-008Remove the wires from the terminal block on the HPSOV (1).
 (5)  S 024-068Remove the nut, the bolt, and the washers that hold the bonding jumper to the valve.
 NOTE:____ Keep the bolt, the nut and the washers for the installation.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 034-009
 (6)  
Disconnect the actuator pressure tube from the valve actuator union (6).

 S 034-010

 (7)  
Remove the union (6).

 (a)  
Discard the O-ring (7).

 S 034-011
 (8)  
Remove the couplings (4) upstream of the HPSOV (1).

 S 034-046

 (9)  
Remove the couplings (4) downstream of the HPSOV (1).

 S 024-012

 (10)
 Remove the HPSOV (1).

 (a)  
If you cannot easily remove the HPSOV because it is too tight, loosen one of the duct sections on either side of the HPSOV (AMM 36-11-01/401).

 S 034-013
 (11)
 Remove the seals (5) from the duct flanges.

 S 034-014

 (12)
 Put covers on the open ducts to keep out unwanted objects.

 S 024-063

 (13)
 Remove the band clamp from the valve actuator.

 NOTE: Keep the band clamp for the installation.
____
 TASK 36-11-05-404-041
 3.  Install the HPSOV (Fig. 401)_________________
 A. Consumable Materials
 (1)  
D01062, Never-Seez, Pure Nickel Special, NSBT-8N
 (High temperature anti-seize compound)

 (2)  
G00095 Detector - Leak, Leak-Tek (160X)

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A
747-400
MAINTENANCE MANUAL

 (3)
G00145 Tape - Permacel 421

 B.
References

 (1)
AMM 20-11-28/401, Lockwire

 (2)
24-22-00/201, Manual Control

 (3)
AMM 36-11-01/401, Pneumatic Manifold

 (4)
71-00-00/201, Power Plant

 (5)
71-11-04/201, Fan Cowl Panels

 (6)
71-11-06/201, Core Cowl Panels

 (7)
78-31-00/201, Thrust Reverser System

 C.
Access

 (1)  
Location Zone 412 Engine 1 - High Pressure Compressor Case 9 o'clock 422 Engine 2 - High Pressure Compressor Case 9 o'clock 432 Engine 3 - High Pressure Compressor Case 9 o'clock 442 Engine 4 - High Pressure Compressor Case 9 o'clock

 (2)  
Access Panel
 415 Left Thrust Reverser Half - Engine 1
 425 Left Thrust Reverser Half - Engine 2
　
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