D.
Remove the solenoid for the isolation valve (Fig. 401).

 S 024-019-N00
 (1)  Remove the isolation valve for the thrust reverser
 (AMM 78-34-05/401).

 NOTE: Because of the tight isolation valve installation, it is
____ recommended that you remove the isolation valve to replace the solenoid.
 S 024-007-N00
 (2)  
Remove the four socket head screws that attach the solenoid assembly to the isolation valve.

 S 024-022-N00

 (3)  
Remove the jumper wire fron the socket head screw (Fig. 401)

 S 024-021-N00

 (4)  
Remove the solenoid assembly from the isolation valve module.

 NOTE: The plug assembly with the retaining ring and packing will
____ stay in the housing when the solenoid is removed.
 S 024-020-N00
 (5)  Remove the plate gasket.
 TASK 78-34-08-404-008-N00
 3. Install the Thrust Reverser Isolation Valve Solenoid
____________________________________________________
 A. References
 (1)  
AMM 27-62-00/501, Spoiler/Speedbrake Control System

 (2)  
AMM 78-31-00/201, Thrust Reverser System

 (3)  
AMM 78-34-05/401, Thrust Reverser Isolation Valve

 (4)  
IPC 78-34-05 Fig. 5 and 6

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
SEE A
SEE A
OUTBOARD INSTALLATION
INBOARD INSTALLATION
JUMPER WIRE SOLENOID VALVE
ISOLATION VALVE MODULE
FWD
OUTBOARD INSTALLATION
(INBOARD SIMILAR)

A

Thrust Reverser Isolation Valve Solenoid Installation
Figure 401

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
B. Access
 (1)  
Location Zone
 450 Strut 1
 460 Strut 2
 470 Strut 3
 480 Strut 4

 (2)  
Access Panels 451BL Thrust Reverser Isolation Valve Access Door - Strut 1 462EL Aft Upper Midspar Pressure Relief Access Door - Strut 2 472EL Aft Upper Midspar Pressure Relief Access Door - Strut 3 481BL Thrust Reverser Isolation Valve Access Door - Strut 4

 C.
Install the Solenoid for the Isolation Valve (Fig. 401)

 S 434-009-N00
 (1)  
Put the gasket on the isolation valve module.

 S 424-010-N00

 (2)  
Install the solenoid on the isolation valve module with the four socket head screws.

 (a)  Make sure you attach the jumper wire to the correct forward socket head screw (Fig. 401).
 S 424-023-N00
 (3)  
Do the procedure to install the Thrust Reverser Hydraulic Isolation Valve (AMM 78-34-05/401).

 D.
Put the Airplane Back to its Usual Condition

 S 444-013-N00
 (1)  
Do the activation procedure for the thrust reverser
 (AMM 78-31-00/201).

 S 444-014-N00

 (2)  
Do the activation procedure for the spoiler/speedbrake control system (AMM 27-62-00/501).

 (3)  
Remove the DO-NOT-OPERATE tag from the thrust levers.

 S 864-015-N00
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 ALL  ú ú N01 Page 404 ú Jun 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
THRUST REVERSER DIRECTIONAL CONTROL SOLENOID - REMOVAL/INSTALLATION
___________________________________________________________________
　
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