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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A
B
A
B
A
A 
STRONGBACK 
CRACK  VANE 
VANE 
BAY 
STRONGBACK 
CRACK  STRONGBACK 
BAY 
B-B
A-A 
Cascade Vane Inspection/Check 
Figure 601 

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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S 046-013-N00
 WARNING: DO THE THRUST REVERSER DEACTIVATION PROCEDURE TO PREVENT THE
_______ OPERATION OF THE THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (3)  
Do this task: Thrust Reverser Deactivation for Ground Maintenance (Ref 78-31-00/201).

 D.
Do an Inspection of the Cascade Segments (Fig. 601).

 S 216-014-N00
 (1)  
Examine the cascade segments for the damage and the correct installation.

 (a)  
Examine for nicks, gouges, scratches, cracks, or damage caused by corrosion in the cascade vanes, strongbacks and fastener hole flanges. 1) Replace the cascade segments that have the damage or the

 cracks (Ref 78-31-16/401).

 (b)  
Examine the cascade segments for the loose fasteners. 1) Tighten the loose fasteners (Ref 78-31-16/401).

 E.
Put the Airplane Back to Its Usual Condition.

 S 446-015-N00
 (1)  
Do the activation procedure for the thrust reversers
 (Ref 78-31-00/201).

 S 866-016-N00

 (2)  
Operate the thrust reverser to the stow position
 (Ref 78-31-00/201).

 S 446-017-N00

 (3)  
Do the activation procedure for the speed brake control system (Ref 27-62-00/201).

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A
747-400 MAINTENANCE MANUAL
 THRUST REVERSER HYDRAULIC ACTUATORS - MAINTENANCE PRACTICES
___________________________________________________________
 1.  General_______
 A.  The purpose of this procedure is to do a test for internal leakage of the thrust reverser hydraulic actuators and to show which actuator has internal leakage. A thrust reverser stow time of more than three seconds is the only operational indication of severe internal leakage of the thrust reverser actuators. This procedure applies hydraulic pressure to the stow side of the thrust reverser actuators.
 TASK 78-31-17-002-001-N00
 2.  Do a Test for Internal Leaks of the Thrust Reverser Hydraulic Actuators_______________________________________________________________________
 A.  References
 (1)  
AMM 24-22-00/201, Manual Control - Maintenenace Practices

 (2)  
AMM 29-11-00/201, Main (Left, Right, and Center) Hydraulic

 (3)  
AMM 71-11-04/201, Fan Cowl Panels

 (4)  
AMM 78-31-00/201, Thrust Reverser System

 (5)  
AMM 78-31-00/501, Thrust Reverser System

 (6)  
AMM 78-36-01/401, Thrust Reverser Proximity Sensors

 B.  
Access

 (1)  
Location Zones 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 Panels
 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.
Prepare to test for internal leaks of the thrust reverser actuators.

 (1)
Make sure the thrust reverser to be tested is fully stowed.
　
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