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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 042-102-N00
 WARNING: WITH THE HYDRAULIC POWER APPLIED, THE EXTENDED THRUST REVERSER
_______ WILL RETRACT WITHOUT ELECTRICAL POWER APPLIED TO THE DIRECTIONAL CONTROL VALVE.
 WARNING: DO THE THRUST REVERSER DEACTIVATION TASK TO PREVENT THE
_______ OPERATION OF THE THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (9)  Do the Thrust Reverser Deactivation for Ground Maintenance task or remove the hydraulic power if it is necessary (AMM 29-11-00/201).
 TASK 78-31-00-862-103-N00
 9. Thrust Reverser Operation - Retract (Power Procedure)
_____________________________________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 27-62-00/201, Speed Brake Control System

 (3)  
AMM 27-81-00/201, Leading Edge Flap Systems

 (4)  
AMM 29-11-00/201, Main Hydraulic Systems

 (5)  
AMM 71-11-06/201, Fan Cowl Panels

 B.
Access

 (1)  
Location Zone 415 and 416 Engine 1 - Thrust Reverser Halves 425 and 426 Engine 2 - Thrust Reverser Halves 435 and 436 Engine 3 - Thrust Reverser Halves 445 and 446 Engine 4 - Thrust Reverser Halves

 (2)  
Access Panel
 413 and 414 Fan Cowl Panels - Engine 1
 423 and 424 Fan Cowl Panels - Engine 2
 433 and 434 Fan Cowl Panels - Engine 3
 443 and 444 Fan Cowl Panels - Engine 4

 C.
Procedure

 S 442-104-N00
 (1)  Do the Thrust Reverser Activation After Ground Maintenance task or supply hydraulic power if it is necessary (AMM 29-11-00/201).
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S 982-105-N00

 WARNING:_______ THE THRUST REVERSER WILL RETRACT WHEN YOU MOVE THE REVERSE
 THRUST LEVERS TO THE FORWARD IDLE POSITION.  MAKE SURE THE
 PERSONS AND THE EQUIPMENT ARE CLEAR OF THE THRUST REVERSER
 BEFORE YOU OPERATE THE REVERSER.  INJURY TO PERSONS OR DAMAGE

 TO THE EQUIPMENT CAN OCCUR.
 (2)  
Move the reverse thrust levers to the forward idle position to permit the thrust reverser to retract.

 S 862-106-N00

 (3)  
Remove the hydraulic power (AMM 29-11-00/201).

 S 222-107-N00

 (4)  
Make sure the thrust reverser sleeves are in the fully stowed position after you remove the hydraulic power.

 (a)  Measure the rod end clearance for the center locking hydraulic actuator to make sure it is not more than 0.100 inch (2.540 mm) (Fig. 206).
 S 412-108-N00
 (5)  
Close the fan cowl panels (AMM 71-11-04/201).

 S 442-109-N00

 (6)  
Do this task: "Speed Brake Control System Activation" (AMM 27-62-00/201).

 S 442-110-N00

 (7)  
Do this task: "Leading Edge Flaps Activation" (AMM 27-81-00/201).

 S 862-111-N00

 (8)  
Remove the electrical power if it is not necessary (AMM 24-22-00/201).

 TASK 78-31-00-042-112-N00
 10. Thrust Reverser Deactivation For Ground Maintenance
______________________________________________________ (Fig. 207)
 A. General
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