S 644-114

 (11)
 Do this task to lubricate the aftflap drive mechanism:  "Trailing Edge Flap System Lubrication" (AMM 12-21-20/301).

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747-400 MAINTENANCE MANUAL
 E. Put the Airplane Back to Its Usual Condition
 S 864-115
 (1)
Put the flap control lever in the UP detent to retract the flaps.

 S 864-116

 (2)  
Do this task to depressurize hydraulic system No. 1: "Hydraulic System Depressurization" (AMM 29-11-00/201).

 S 864-117

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

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747-400 MAINTENANCE MANUAL
 INBOARD AFTFLAP DRIVE MECHANISM - INSPECTION/CHECK
__________________________________________________
 1.  General_______
 A.  There is one task in this procedure; an inspection of the parts of the inboard aftflap drive mechanism. The parts include bushings, bolts, bearings, screws, and the hook of the geneva cam.
 B.  You usually do this procedure before you install a component of the drive mechanism. To do the inspection, you must remove the part from the airplane.
 TASK 27-51-39-206-001
 2.  Inboard Aftflap Drive Mechanism Inspection__________________________________________
 A.  Standard Tools and Equipment
 (1)  
Micrometer - 0 to 1 inch (0 to 25 mm)

 (2)  
Micrometer - 1 to 2 inch (25 to 50 mm), To Measure Inner Dimensions

 (3)  
Micrometer - 1 to 2 inch (25 to 50 mm), To Measure Outer Dimensions

 (4)  
Vernier Caliper

 B.  
References

 (1)  
27-51-39/401, Inboard Aftflap Drive Mechanism

 C.  
Access

 (1)  
Location Zone 563 Outboard Flap Track Fairing, Inboard Flap, LH, (Track No. 3) 561 Inboard Flap Track Fairing, Inboard Flap, LH, (Track No. 4) 661 Inboard Flap Track Fairing, Inboard Flap, RH, (Track No. 5)

 663  Outboard Flap Track Fairing, Inboard Flap, RH, (Track No. 6)
 D.  Procedure
 S 026-002
 (1)  
Do this task to remove the component from the aftflap drive mechanism: "Inboard Aftflap Drive Mechanism Removal" (Ref 27-51-39/401).

 S 226-003

 (2)
Examine the parts of the aftflap drive mechanism for worn areas:

 (a)  
Remove the parts.

 (b)  
Use a micrometer or a vernier caliper to measure the parts.

 (c)  
Compare the dimensions you measured with the permitted dimension shown in Fig. 601.

 (d)  
Repair or replace the parts that are not in the tolerance.

 (e)  
Install the parts.

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747-400 MAINTENANCE MANUAL
 S 426-004
 (3)  Do this task to install the component on the aftflap drive mechanism: "Inboard Aftflap Drive Mechanism Installation" (Ref 27-51-39/401).
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