TASK 78-31-01-206-001-N00
 2.  Do a Check of the Thrust Reverser Shims
_______________________________________
 A.  References
 (1)  
AMM 27-62-00/201, Speed Brake Control System

 (2)  
AMM 71-11-04/201, Fan Cowl Panels

 (3)  
AMM 71-11-06/201, Core Cowl Panels

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

 (5)  
AMM 78-31-01/501, Thrust Reverser

 (6)  
IPC 78-31-01 Fig. 1

 B.  
Consumable Materials

 (1)  
A00000 Modeling Clay, Commercially Available

 (2)  
D00250 Petroleum Jelly, White

 C.  
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
 417 and 418 Core Cowl Panels - Engine 1
 423 and 424 Fan Cowl Panels - Engine 2
 427 and 428 Core Cowl Panels - Engine 2
 433 and 434 Fan Cowl Panels - Engine 3
 437 and 438 Core Cowl Panels - Engine 3
 443 and 444 Fan Cowl Panels - Engine 4
 447 and 448 Core Cowl Panels - Engine 4

 D.  
Prepare To Do a Check of the Thrust Reverser Shims (Fig. 601)

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 78-31-01
 ALL  ú ú N01 Page 601 ú Oct 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
A  C  B 
UPPER BIFURCATION  STRUT 
A 
SHIM  BIFURCATION LOWER  C  A-A  B  INNER ENGINE VEE-RING VEE-GROOVE/ THRUST REVERSER 
BIFURCATION UPPER  SHIM 
UPPER BIFURCATION 
VEE-RING REVERSER THRUST 
VEE-RING REVERSER THRUST 
BIFURCATION LOWER BIFURCATION LOWER  SHIM 
SHIM  B-B  FWD  FWD  C-C 
Figure 601 Thrust Reverser Inspection/Check 

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 ALL  ú ú N01 Page 602 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 046-014-N00
 WARNING: DO THE DEACTIVATION PROCEDURE FOR THE SPEED BRAKE CONTROL
_______
 SYSTEM. IF YOU DO NOT DO THIS, THE SPOILERS CAN MOVE QUICKLY
 WHEN YOU MOVE THE THRUST LEVERS. THIS CAN CAUSE INJURY TO
 PERSONS AND DAMAGE TO EQUIPMENT.

 (1)  
Do the deactivation procedure for the Speed Brake Control System
 (AMM 27-62-00/201).

 S 866-015-N00

 (2)  
Make sure the forward thrust levers are in the idle position and
 attach the DO-NOT-OPERATE tags.

 S 866-016-N00

 (3)  
Make sure the reverse thrust levers are in the fully stowed position and attach the DO-NOT-OPERATE tags.

 S 046-017-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 the thrust reverser for ground
 maintenance (AMM 78-31-00/201).

 S 016-018-N00

 (5)  
Open the fan cowl panels (AMM 71-11-04/201).

 S 016-019-N00

 (6)  
Open the core cowl panels (AMM 71-11-06/201).

 S 016-020-N00
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______
 REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO
 PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.

 (7)  
Open the thrust reversers (AMM 78-31-00/201).

 E.
Do a Check of the Thrust Reverser Shims (Fig. 601)

 S 216-029-N00
 (1)  Apply modeling clay (approximately 0.20 inch thick) to each of these shims:
　
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