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 1) Make a note of this dimension.
 WARNING: BE CAREFUL WHEN YOU WEDGE THE BLOCKER DOOR AWAY FROM THE
_______ ACOUSTIC PANEL. IF YOU ARE NOT CAREFUL, THE WEDGE CAN CAUSE INJURY TO YOU AND DAMAGE TO THE BLOCKER DOOR OR THE ACOUSTIC PANEL.
 (b)  Carefully push a hardwood or phenolic wedge (approx. one inch wide) between the aft edge of the blocker door and the forward edge of the acoustic panel.
 NOTE: This will push the blocker door forward.
____
 (c)  
While you carefully push the blocker door forward, measure the clearance between the blocker door and the acoustic panel again. 1) Again, make a note of this dimension.

 (d)  
Subtract the first dimension from the second dimension, which you got after you pushed the blocker door forward.

 NOTE: This gives you a measure of the play, or movement,
____ in the blocker door bearings and hinge bolts.
 (e)  If the play is more than 0.008 inch, make a note of the blocker door location and continue the inspection.
 WARNING: BE CAREFUL WHEN YOU WEDGE THE BLOCKER DOOR AWAY FROM THE
_______ PANEL ADJACENT TO IT. IF YOU ARE NOT CAREFUL, THE WEDGE CAN CAUSE INJURY TO YOU AND DAMAGE TO THE BLOCKER DOOR OR THE PANEL ADJACENT TO IT.
 (f)  Carefully push a wedge between the side edge of the blocker door and the panel adjacent to it.
 NOTE: This will push the blocker door sideways.
____
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(g)  
While you carefully push the blocker door sideways, measure the clearance between the blocker door and the panel adjacent to it.

 (h)  
If the clearance is more than 0.135 inch, make a note of the blocker door location and continue the inspection.

 S 986-026-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.
 (6)  
Manually extend the thrust reverser to lift the blocker doors into the deployed position (AMM 78-31-00/201).

 S 216-027-N00

 (7)  
Go into the fan cowl and look for these conditions on each blocker door that has too much play or clearance:

 (a)  
Make sure the nuts on the hinge bolts are tight.

 (b)  
Make sure the nuts on the drag link bolts are tight.

 (c)  
Make sure the shank lengths of the hinge bolts are correct.

 (d)  
Make sure the shank length of the drag link bolt is correct.

 

 NOTE: With the nut tightened, the bushings must not push
____ too tightly against the spherical bearings of the drag link assembly.
 (e)  
Make sure the bushings in the drag link hinge and the blocker door hinges are not worn.

 (f)  
Make sure the hinge fittings on the blocker door do not have cracks or other damage.

 (g)  
If you find these conditions, replace the blocker door or the applicable hinge components that have the damage (AMM 78-31-14/401).

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 216-028-N00
 (8)  For composite blocker doors, examine the aft side of each door for resin cracks (Fig. 602).
 NOTE: The aft side of each metal blocker door is painted green.
____ The aft side of each composite blocker door is painted silver. Each thrust reverser half can have the two types of blocker doors together on the same assembly.
 (a)  Examine the top of the hinge arms for resin cracks.
 NOTE: Resin cracks are permitted on the top of the hinge
____ arms. These resin cracks must not extend to the hinge arm sides or be in the circular portion (lug) of the hinge arm.
 (b)  Examine the bead (joint) between the hinge arm and the blocker door.
　
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