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 retract direction. 6) Apply a light layer of grease to the drive shaft and the drive unit splines. 7) Install the drive shaft (16) between the gearbox and the drive unit. 8) Install the lockwire on the screws (15).
 S 094-014
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO NOT DO THE STEPS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (3)  
Do this task: "Safety Lock Removal and Leading Edge Flap Activation" (Ref 27-81-00/201).

 S 864-025

 (7)  
Do this task to pressurize hydraulic systems No. 1 and 4: "Hydraulic System Pressurization" (Ref 29-11-00/201).

 S 224-018

 (8)  
Do a check on the retract stop clearance: NOTE: If it is necessary, do this check again until you get the

 (4)  Do this task:  "Leading Edge Flap Retraction" (Ref 27-81-00/201).
 (5)  S 864-015Do this task:  "Supply Electrical Power" (Ref 24-22-00/201).
 (6)  S 864-016Do this task:  "Supply Pneumatic Power" (Ref 36-00-00/201).
 S 864-024

____ correct clearance.
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A
747-400 MAINTENANCE MANUAL
 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.
 (a)  
Move the flap control lever to the 5 unit detent to extend the LE flaps.

 (b)  
Push a small rod through the hole of the retract stop bolt to extend the clearance indicator pin 0.15-0.20 inch (Section A-A, Fig. 401).

 (c)  
Move the flap control lever to the full UP detent then the 5 unit detent to operate the flaps pneumatically.

 (d)  
Measure the height of the clearance indicator pin.

 (e)  
Make sure the retract stop clearance is 0.04-0.10 inch (Detail B, Fig. 401). 1) If it is necessary, move the washers to adjust the retract

 stop bolt to get the correct clearance.

 (f)  
When you get the correct clearance, push the indicator pin in until it aligns with the head of the stop bolt.

 (g)  
Install the lockwire on the coupling bolts.

 (h)  
Move the flap control lever to full UP detent to retract the LE flaps.

 G.
Put the Airplane Back to Its Usual Condition

 S 864-019
 (1)  
Do this task to depressurize hydraulic systems No. 1 and 4:
 "Hydraulic System Depressurization" (Ref 29-11-00/201).

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

 (3)  
Do this task: "Electrical Power Removal" (Ref 24-22-00/201).

 S 864-020
 S 864-021
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 OFFSET GEARBOX - INSPECTION/CHECK
_________________________________
 1.  General
_______
 A.  This procedure contains the task to do a check of the krueger flap offset gearbox. The procedure measures the fit of the coupling half/pinion, pinion/gearbox and the axial play of the drive shaft (Fig. 601).
 B.  An offset gearbox is installed adjacent to the two drive units of the Krueger flaps.
 TASK 27-81-16-206-001
 2.  Offset Gearbox Inspection/Check
_______________________________
 A.  Standard Tools and Equipment
 (1)  
Micrometers, to measure internally and externally

 B.  
References

 (1)  
27-81-16/401, Offset Gearbox
　
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