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 ALL  ú ú N01 Page 401 ú Jun 10/94
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 864-016-N00
 (3)  Make sure the reverse thrust levers are in the forward and down (stow) position.
 (a)  Install the DO-NOT-OPERATE tag to the thrust levers.
 S 044-017-N00
 WARNING: DO THE DEACTIVATION PROCEDURE TO PREVENT THE OPERATION OF THE
_______ THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (4)  
Do the deactivation procedure for thrust reverser for ground maintenance (AMM 78-31-00/201).

 S 014-018-N00

 (5)  
Remove the applicable forward fairing panels.

 S 214-019-N00

 (6)  
Make sure the forward fairing panel is not damaged.

 D.  
Remove the Directional Control Valve for the Thrust Reverser (Fig. 401 and 401A).

 S 024-020-N00
 (1) Disconnect the electrical connector on the aft face of the DCV (2).
 (a)  Install the protection covers on the electrical connectors.
 S 024-021-N00
 CAUTION:_______DO NOT LET THE HYDRAULIC FLUID FALL ON THE ENGINE. CATCH THE HYDRAULIC FLUID IN A CONTAINER. QUICKLY CLEAN THE HYDRAULIC FLUID THAT FALLS ON THE ENGINE OR DAMAGE CAN OCCUR.
 (2)  
Disconnect the hydraulic pressure line from the DCV (2).

 S 024-022-N00

 (3)  
Disconnect the hydraulic return line from the DCV (2).

 S 024-023-N00

 (4)  
AIRPLANES WITHOUT ONE-WAY VALVE RESTRICTORS; remove the DCV (2) and extend flow control tee (1) from the strut (Fig. 401).

 (a)  
Loosen the clamp for the hydraulic extend and retract lines.

 (b)  
Disconnect the retract flow control tee (4) from the lower forward face of the DCV (2) (AMM 78-34-02/401).

 (c)  
Disconnect the two hydraulic lines (5) from the extend flow control tee (1).

 

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 78-34-01
 ALL  ú ú N02 Page 402 ú Oct 10/95
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FORWARD UPPER FAIRING SEE

 

A
SOLENOID ELECTRICAL
SWIVEL NUT CONNECTOR

DIRECTIONAL CONTROL VALVE
Thrust Reverser Directional Control Valve Installation
Figure 401 (Sheet 1)

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 78-34-01
 ú ú N02 Page 403 ú Jun 10/95
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////

19. NUT
Thrust Reverser Directional Control Valve Installation
Figure 401 (Sheet 2)

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 78-34-01
 ú ú N02 Page 404 ú Jun 10/95
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E14085
FORWARD UPPER

Thrust Reverser Directional Control Valve Installation
Figure 401A (Sheet 1)

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 78-34-01
 RESTRICTORS  ú ú N02 Page 405 ú Jun 10/95
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
HYDRAULIC RETURN LINE
9.  UNION  HYDRAULIC 
10.  PACKING  PRESSURE LINE 
　
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