(2)  
AMM 78-31-00/201, Thrust Reverser System

 (3)  
AMM 78-31-14/601, Thrust Reverser Blocker Doors

 (4)  
AMM 78-31-15/401, Thrust Reverser Blocker Door Drag Links

 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.
Install the Blocker Doors (Fig. 401).

 S 864-084-N00
 (1)  Make sure the DO-NOT-OPERATE tags are installed on the reverse thrust levers in the flight compartment.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 78-31-14
 ALL  ú ú N01 Page 405 ú Feb 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 434-080-N00
 (2)  
Remove the tape and the shop rag from the drag link (9).

 S 424-085-N00

 (3)  
Install the blocker door (5) through the aft end of the thrust reverser:

 (a)  If bracket (6) is installed, loosen the nut (7) that attaches the bracket (6) to the sleeve hinge fitting (8).
 NOTE: The bolt cannot turn with the bracket installed.
____
 (b)  
Align the bolt holes in the hinge arms of the blocker door (5) with the holes in the sleeve hinge fittings (8).

 (c)  
Install the bolt at the clamped hinge. 1) Install the bushing (3), one washer (2) below the bolt head, bolt (1), three washers (2) and nut (4).

 2)  Tighten the nut (4) to 80 - 100 pound-inches (10.6 - 13.3 newton-meters).

 (d)  
Install the bolt at the floating hinge.

 1)  Install the bolt (1), washer (2), the two bushings (3) and nut (4) through the hinge fittings (8) and bracket (6).
 NOTE: If the bracket (6) is not on the sleeve, install a
____ washer (2) below the head of the bolt (1).
 2) Adjust the bracket (6). 3) Tighten the nut (4) to 80 - 100 pound-inches (10.6 - 13.3 newton-meters). 4) Tighten the nut (7) to hold the bracket (6) on the sleeve hinge fitting (8).
 S 984-056-N00
 (4)  Make sure there is no side to side movement of the blocker door.
 NOTE: This does not include the movement of the race on the
____ spherical ball in the bearings. Side movement shows that the sleeve bushing has not pushed the hinge bearing against the flanged bushing. This shows that the nut on the hinge bolt is not correctly tightened.
 (a)  Hold the blocker door (5) in the open position.
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 78-31-14
 ALL  ú ú N01 Page 406 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(b)  
Try to move the blocker door (5) from side to side on the hinge axis.

 (c)  
If the blocker door moves, install a washer (2) below the
 nut (4).

 (d)  
Tighten the nut (4) to 80 - 100 pound-inches (10.6 - 13.3
 newton-meters).

 S 434-042-N00
 (5)  Connect the drag link to the fitting on the blocker door (5) (AMM 78-31-15/401).
 S 984-081-N00
 WARNING: MAKE SURE ALL PERSONS AND EQUIPMENT ARE OUT OF THE FAN COWL AND
_______ AWAY FROM THE THRUST REVERSER. IF YOU DO NOT DO THIS, INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR WHEN YOU RETRACT THE THRUST REVERSER.
 (6)  
Manually retract the thrust reverser to put the blocker doors into the stowed position (AMM 78-31-00/201).
　
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