(3)  
AMM 78-31-14/401, Thrust Reverser Blocker Door

 (4)  
IPC 78-31-14, Fig. 1

 C.  
Access

 (1)  
Location Zones
 410 Engine 1 Nacelles
 420 Engine 2 Nacelles
 430 Engine 3 Nacelles
 440 Engine 4 Nacelles

 (2)  
Access Panels 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

 D.  
Prepare to Do a Check of the Blocker Doors.

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 78-31-14
 ALL  ú ú N01 Page 601 ú Oct 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 046-011-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 866-012-N00

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

 S 866-013-N00

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

 S 046-014-N00
 WARNING: DO THE DEACTIVATION PROCEDURE FOR THE THRUST REVERSER 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).

 NOTE: Do the deactivation procedure for the stow valve and
____ motorized isolation valve only. DO NOT put the streamered pins in the thrust reverser sleeves. You will need to manually extend and retract the thrust reverser sleeves in the steps that follow.
 S 566-046-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 EXTEND THE THRUST REVERSER.
 (5)  
Manually extend the thrust reverser to lift the blocker doors.
 (AMM 78-31-00/201). DO NOT fully deploy the thrust reverser.
 Extend the thrust reverser sleeve until you can hold the blocker
 door with your hands as close to the hings fittings as possible.

 E.
Do a Check of the Blocker Doors (Fig. 601).

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 ALL  ú ú N01 Page 602 ú Oct 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
SEE A
A  A FITTING SLEEVE HINGE  (12 LOCATIONS) BLOCKER DOOR 
A  A 
B FITTING SLEEVE HINGE  (REF) DRAG LINK  (REF) B DRAG LINK 
B  B 
(12 LOCATIONS) BLOCKER DOOR 

METAL BLOCKER DOOR IN THE OPEN POSITION COMPOSITE BLOCKER DOOR IN THE OPEN POSITION (VIEW IN THE FORWARD DIRECTION) (VIEW IN THE FORWARD DIRECTION)
A A
1. HINGE/BEARING RACE 1. HINGE/BEARING RACE
2. BEARING RACE/ 2. BEARING RACE/ 3. SPHR 5. FLG BUSHING/ SPHR BEARING SPHR BEARINGBEARING/BUSHING
3. SPHR  BOLT
BEARING/ BOLT
1
BOLT 4. BUSHING/
BOLT BOLT
1
5. FLG 
BUSHING/ 
7. BUSHING/BOLT  BUSHING 
4. BUSHING/BOLT 
6. HINGE 
6. FLG BUSHING/ HINGE FITTING  DOOR (HINGE) BLOCKER  8. HINGE FITTING/BUSHING  FLG BUSHING FITTING/  DOOR (HINGE) BLOCKER  NUT 
CLAMPED HINGE  FLOATING HINGE 
A-A  B-B 

1
THE BOLT HEAD DIRECTION IS OPTIONAL
Thrust Reverser Blocker Door Wear Limits
Figure 601 (Sheet 1)
　
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