(10)
Remove the forward fairing.
S 014-065-003
(11)
Remove the engine fan cowls (AMM 71-11-04/401).
S 044-066-003
WARNING: DO THE DEACTIVATION PROCEDURE TO PREVENT THE OPERATION OF THE
_______ THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
(12)
Do the deactivation procedure for the thrust reverser for ground maintenance (AMM 78-31-00/201).
S 014-058-003
(13)
Open the core cowl panels (AMM 71-11-06/201).
S 864-067-003
(14)
Position FUEL CONTROL toggle switches, located on engine start module, to CUTOFF. Attach DO-NOT-OPERATE identifier to switches.
S 864-068-003
(15)
Close the fuel shutoff valve.
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747-400 MAINTENANCE MANUAL
S 864-069-003
(16)
Close the hydraulic supply shutoff valve.
S 494-070-003
(17)
Use the tool placard to install the engine support sling, A54001-44 (Fig. 401).
S 034-071-003
CAUTION: DO NOT LIFT THE ENGINE WITH A FORCE THAT IS MORE THAN NECESSARY
_______ TO PERMIT THE PIN/BOLT TO TURN WHEN YOU APPLY 125 POUND-INCHES MAXIMUM TORQUE. DO NOT APPLY A TOTAL LOAD OF MORE THAN 17,000 POUNDS (MORE THAN THE WEIGHT OF THE EQUIPMENT). DO NOT APPLY A LOAD OF MORE THAN 8,500 POUNDS ON ONE ATTACH POINT. DO NOT APPLY A LOAD WITH A DIFFERENCE BETWEEN THE TWO SIDES OF MORE THAN 1,500 POUNDS. LIFT THE ENGINE VERTICALLY. IF THE CRANE LIFTS THE ENGINE WITH TOO MUCH FORCE, OR AT AN INCORRECT ANGLE, DAMAGE TO THE ENGINE CAN OCCUR.
(18) Do these steps to remove the load from the pin/bolt that you will remove:
(a)
Slowly apply a small load with the crane.
(b)
Adjust the lever hoists so the load on the inboard and outboard dynamometers is approximately equal.
(c)
Move the crane as necessary to apply a vertical load at the tool attach points. 1) At the side of the engine, visually align the engine sling
between the flanges on the fan case so the beam assembly is directly above the flanges. 2) At the front or rear of the engine, visually align the engine sling vertically side-to-side.
(d)
Slowly apply a load to the sling until you reach a load of 2500 pounds. 1) Monitor the angle of the engine sling side-to-side and
forward/aft during the procedure.
(e)
Slowly increase the load until you can turn the pin/bolt that you will remove with a maximum torque of 125 pound-inches (14.3 N.m). 1) Make sure the fuse pin, caps, and bolt turn as an assembly.
a) If it is necessary, you can tighten the fuse pin castellated nut to a maximum torque of 200 pound-inches
(22.6 N.m) so the assembly turns.
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747-400 MAINTENANCE MANUAL
2) You can make these adjustments to more accurately find the correct load:
NOTE: When the load is removed correctly, the pin/bolt
____ that you will remove should turn easily.
a) Adjust the individual load on each of the two chain hoists. b) Move the lifting point of the overhead crane inboard or outboard a minimum distance from the center position.
H. Remove the Applicable Attach Pin/Bolt.
S 024-072-003
CAUTION: MAKE SURE THE UPPER LINK AND BOTH MIDSPAR (INBOARD) OR BOTH
_______ SPRING BEAM (OUTBOARD) FUSE PINS ARE INSTALLED. IF THESE FUSE PINS ARE NOT INSTALLED AND YOU REMOVE A DIAGONAL BRACE PIN/BOLT, DAMAGE TO THE STRUCTURE CAN OCCUR.
(1) Remove the diagonal brace aft fuse pin.
(a)
Make sure that the upper link and both midspar/spring beam fuse pins are installed.
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