(7)
SSM 27-81-04, 27-81-05, 27-81-06

 (8)
WDM 27-81-31, 27-81-32, 27-81-81, 27-81-82

 C.  
Access

 (1)  
Location Zone
 513 Krueger Flap Midflap, LH
 613 Krueger Flap Midflap, RH

 D.  
Prepare for Removal

 (1)
Do this task: "Supply Electrical Power" (Ref 24-22-00/201).

 (2)
Do this task: "Supply Pneumatic Power" (Ref 36-00-00/201).

 S 864-002
 S 864-003
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

SEE B
SEE A
2. BOLT
16. INPUT DRIVE 3. WASHER
SHAFT
SEE B
1. OFFSET
GEARBOX

4. BOLT15. SCREW 5. WASHER
14. OUTPUT  6. NUT
DRIVE (3 LOCATIONS)
SHAFT

7. GEAR
13. SCREW
8. BEARING CLEARANCE
10.
 BOLT  STRUCTURE INDICATOR PIN

11.
 WASHER

12.
 NUT

OUTPUT DRIVE RETRACT(4 LOCATIONS) SHAFT STOP BOLT
9. DRAIN
A
STOP BOLT BRACKET
0.10
INCH  ON ROTARY
0.04
ACTUATOR ARM
WING LEADING EDGE
A  WASHERS
A-A
RETRACT STOP
A
KRUEGER FLAP
FLAP SHOWN RETRACTED
B
Krueger Flap Offset Gearbox Installation Figure 401
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-004
 (3)  Do this task to pressurize hydraulic systems No. 1 and 4: "Hydraulic System Pressurization" (Ref 29-11-00/201).
 S 864-022
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (4)  Move the flap control lever to the 5 unit detent to extend the leading edge (LE) flaps.
 NOTE: You can also extend the flaps electrically.
____
 S 494-006
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______
 THE LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO NOT INSTALL THE SAFETY LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (5)  Do this task : "Extended Leading Edge Flap Deactivation and Safety Lock Installation" (Ref 27-81-00/201).
 (6)  S 864-007Do this task if hydraulic power is not necessary for hydraulic systems No. 1 and 4: "Hydraulic System Depressurization" (Ref 29-11-00/201).
 (7)  S 864-008Do this task if pneumatic power is not necessary: Removal" (Ref 36-00-00/201). "Pneumatic Power
 (8)  S 864-009Do this task if electric power is not necessary: Removal" (Ref 24-22-00/201). "Electrical Power

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A
747-400 MAINTENANCE MANUAL
 E. Procedure
 S 024-010
 (1)  
Remove the offset gearbox:

 (a)  
To help with assembly, install a clamp and make a mark of the positions of the input and output drive shafts.

 (b)  
Remove the screws (15) that attach the drive shaft coupling to the gearbox input shaft.

 (c)  
Disengage the drive shaft (16).

 (d)  
Remove the screws (13) that attach the drive shaft couplings to the gearbox output shaft.
　
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