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 NOTE: Resin cracks are permitted in the bead on the two sides
____ of the hinge arm at the same time. These cracks must not extend more than 0.12 inch from the edge radius onto the aft side of the blocker door.
 (c)  Examine the sides of the hinge arms for resin cracks.
 NOTE: Resin cracks are permitted from the bead onto the sides
____ of the hinge arm for the portion of the hinge arm which does not extend beyond the aft side of the blocker door. These cracks must not extend onto the top of the hinge arm.
 (d)  If you find cracks other than permitted above, remove and replace the blocker door (AMM 78-31-14/401).
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 78-31-14
 ALL  ú ú N01 Page 608 ú Oct 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
HINGE ARM
SEE A  OF THE BLOCKER DOOR
SEE B
SEE  B 
EDGE RADIUS OF THE 
BLOCKER DOOR 
RESIN CRACKS ON 
THE HINGE ARM 
(TOP) 
2 
RESIN CRACKS 
ON THE HINGE 
ARM (TOP) 
5 

AFT SIDE OF THE BLOCKER DOOR
COMPOSITE BLOCKER DOOR (VIEW IN THE FORWARD DIRECTION)
A
RESIN CRACKS ON THE HINGE ARM (SIDE)
4
BLOCKER DOOR (AFT SIDE)
0.12 INCH
RESIN CRACKS IN THE BEAD
1
RESIN CRACKS ON THE HINGE ARM (SIDE)
3
RESIN CRACK LIMITS B
1  RESIN CRACKS ARE PERMITTED IN THE BEAD. THEY MUST NOT EXTEND MORE THAN 0.12 INCH FROM THE EDGE RADIUS ONTO THE AFT SIDE OF THE BLOCKER DOOR. RESIN CRACKS ON BOTH SIDES OF THE HINGE ARM ARE PERMITTED.
2  RESIN CRACKS ARE PERMITTED ON THE TOP OF THE HINGE ARM.
RESIN CRACKS ARE NOT PERMITTED ON THE SIDES OF THE HINGE ARM WHICH EXTEND BEYOND THE AFT SIDE OF THE BLOCKER DOOR.
3  ___
4  RESIN CRACKS ARE PERMITTED FROM THE BEAD ONTO THE SIDES OF THE HINGE ARM WHICH DOES NOT EXTEND BEYOND THE AFT SIDE OF THE BLOCKER DOOR. THEY MUST NOT EXTEND ONTO THE TOP OF THE HINGE ARM.
RESIN CRACKS ARE NOT PERMITTED ON THE TOP OF THE CIRCULAR AREA OF THE HINGE ARM.
5  ___
Thrust Reverser Composite Blocker Door - Inspection/Check
Figure 602

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 78-31-14
 ALL  ú ú N01 Page 609 ú Oct 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
F. Put the Airplane Back to Its Usual Condition.
 S 986-029-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.
 (1)  
Manually retract the thrust reverser (AMM 78-31-00/201).

 S 446-021-N00

 (2)  
Do the activation procedure for the thrust reverser
 (AMM 78-31-00/201).

 S 446-022-N00

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

 S 866-023-N00

 (4)  
Remove the DO-NOT-OPERATE tags from the thrust levers.

 TASK 78-31-14-206-031-N00
 3. Thrust Reverser Composite Blocker Door - Inspection/Check
_________________________________________________________
 A. General
 (1)  
This is a scheduled maintenance task that gives instructions to do an inspection of the hinges on composite blocker doors.

 B.
References

 (1)  
AMM 27-62-00/201, Speed Brake Control System

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

 (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
　
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