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A

747-400
MAINTENANCE MANUAL

FWD 
NON-LOCKING 
UPPER NON-LOCKING  HYDRAULIC 
HYDRAULIC ACTUATOR  ACTUATOR 
(REF) 
SEE  A 
3. TUBE NUT 
1. TOP FLEXSHAFT 
AND TUBE 
5. RETRACT LINE 
FLEX HOSE 

BOX TORQUE (REF) 
FWD 
(RIGHT SIDE SHOWN, LEFT SIDE OPPOSITE) UPPER NON-LOCKING HYDRAULIC ACTUATOR A 
Figure 203 Upper Non-Locking Hydraulic Actuator 

K14563
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 WARNING: MAKE SURE PERSONS AND EQUIPMENT ARE AWAY FROM THE THRUST
_______ REVERSER BEFORE HYDRAULIC PRESSURE IS SUPPLIED TO THE THRUST REVERSER. WITH THE ELECTRICAL POWER SUPPLIED, THE THRUST REVERSER MAY MOVE WHEN THE HYDRAULIC POWER IS SUPPLIED. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (c)  Operate the hydraulic ground service cart to supply 1800 to 3000 psi hydraulic pressure.
 NOTE: The thrust reverser sleeve may move slightly.
____ Do not decrease the hydraulic pressure.
 E. Thrust reverser actuator internal leak check.
 NOTE: Be prepared to catch hydraulic fluid in an
____
 approved container.

 S 792-011-N00
 (1)  
Measure the rate of hydraulic leakage.

 S 792-012-N00

 (2)  
Observe which actuator the leak is coming from.

 F.
Put the airplane back in its usual condition.

 S 432-013-N00
 (1)  Push the top flex shaft tube (1) and lower flex shaft tube (2) back into position so that you can engage several threads of the tube nuts (3) on the drive ports of the center locking actuatuor (4) (Fig. 201).
 NOTE: Make sure you maintain hydraulic pressure to the retract
____
 side of the actuator.

 (a)  
Tighten the support blocks fasteners for the flex shaft tubes.

 (b)  
Tighten both of the tube nuts (3) to 30-35 pound-feet.

 S 942-014-N00
 (2)  If the airplane hydraulic power was used, do the steps that follow:
 (a)  Connect the electrical connector D4180P (LH sleeve) or D4182P (RH sleeve) for the engine strut.
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747-400
MAINTENANCE MANUAL

 (b)  
For the left engine, remove the DO-NOT-CLOSE tag and close this circuit breaker: 1) On the P11 panel:

 a) 11D13, L ENG T/R IND

 (c)  
For the right engine, remove the DO-NOT-CLOSE tags and close these circuit breakers: 1) On the P11 panel:

 a) 11L33, R ENG T/R IND
 b) 11D33, R ENG T/R IND ALTN

 (d)  
Do the activation procedure for the thrust reverser
 (AMM 78-31-00/201).

 (e)  
Remove the DO-NOT-OPERATE tags from the forward thrust lever and the reverse thrust lever.

 (f)  
Do the operational test for the thrust reverser
 (AMM 78-31-00/501).

 (g)  
Operate the thrust reverser through three full deploy and stow cycles.

 (h)  
Close the fan cowl panels (AMM 71-11-04/201).

 S 942-015-N00
 (3)  If the hydraulic ground service cart was used, do the steps that follow:
 (a)  
Operate the hydraulic ground service cart to decrease the hydraulic pressure to zero.

 (b)  
　
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