D.
Prepare to Do a Check of the Composite Blocker Doors
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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).
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(2)
Make sure the forward thrust levers are in the idle position and attach the DO-NOT-OPERATE tags.
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(3)
Make sure the reverse thrust levers are in the fully stowed position and attach the DO-NOT-OPERATE tags.
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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 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.
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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 into the deployed position (AMM 78-31-00/201).
E.
Do a Check of the Composite Blocker Doors (Fig. 602).
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
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WARNING: DO NOT OPEN THE THRUST REVERSER HALVES TO DO THIS INSPECTION.
_______ IF YOU DO, YOUR WEIGHT CAN CAUSE THE FAILURE OF THE HOLD-OPEN ROD WHEN YOU GO INTO THE FAN COWL. THE THRUST REVERSER HALVES WILL FALL TO THE CLOSED POSITION QUICKLY, WHICH CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(1) Go into the aft end of the fan cowl to do the inspection of the composite blocker doors.
NOTE: Be careful when you get access to the blocker doors at the
____ top of the thrust reverser. Push on the opposite sides of the inner walls of the fan cowl with your hands and feet while you lift your body up. Do not pull on the drag links or you will cause damage to them.
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(2) Examine the aft side of each composite blocker door for resin cracks on the hinge arms.
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.
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.
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