(10)
Use the control box to lift the PT90-E until the cradle attach points are approximately 1 inch from the engine attach points.
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(11)
Make sure all the tools and the mechanics that are necessary to remove the engine are on the cradle.
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(12)
Make sure you set the load distribution display on the control box to zero.
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(13)
Use the control box to set the load limit at 11,500 pounds.
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(14)
Use the control box to (slowly) lift the PT90-E and the cradle until you can connect the cradle to the power plant.
(a) Make sure you use the control box to keep the space between the cradle attach points and the power plant at the same distance.
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(15) When the cradle is in the correct position, do the steps that follow:
(a)
Install the aft attach pins into the power plant.
(b)
Install the quick-release pins through the cradle and the forward engine adapters.
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(16) Use the control box to lift the PT90-E, cradle, and power plant.
(a) Make sure the AUTOGUARD button is in the out (on) position.
CAUTION: MAKE SURE YOU OPERATE THE CONTROL BOX CORRECTLY SO YOU SEE
_______ THE LED IS IN THE CENTER OF THE DISPLAY. IF YOU DO NOT, YOU CAN CAUSE SIDE LOADS ON THE ENGINE MOUNT AND STRUT AND CAUSE DAMAGE TO EQUIMENT AND INJURY TO PERSONS.
(b)
Make sure you keep the light emitting diode (LED) for the load distribution display on the control box in the center of the display.
(c)
Make sure you do not lift the engine too much.
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(17) Disconnect the engine mounts with the steps that follow (Fig. 411A):
(a)
Install the deep socket and the torque adapter of the torque equipment (A71003) on the forward or aft vertical tension bolts (1, 2, or 12).
(b)
Loosen the forward and aft vertical tension bolts (1, 2, and 12) one-half turn.
NOTE:____The load cell indications must not change. Make sure there is a distance between the engine mounts and the strut.
(c)
Make sure you monitor the load distribution display and the engine-to-strut interface. 1) Make sure the load distribution display does not change.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
2) Make sure you do not see a small distance between the engine mounts and the strut.
3) If you see a small distance between the engine mount and the strut, use the control box to slowly lift the engine until you cannot see the small distance.
NOTE:____ If you see the load distribution display increase,
make sure the load does not increase more than the
maximum load limits.
4) Carefully loosen the vertical tension bolts (1, 2, and 12)
another one-half turn.
5) Make sure you monitor the load distribution display and the
engine-to-strut interface.
6) Make sure the load distribution display does not change and
you do not see a gap between the forward and the aft engine
mounts and the strut.
NOTE:____ The weight of the engine is held by the PT90-E
engine lift equipment.
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CAUTION: MAKE SURE YOU ARE VERY CAREFUL WHEN YOU LOWER THE POWER PLANT.
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