(3)  
27-51-41/401, Ball Screw

 (4)  
29-11-00/201, Main Hydraulic Supply System

 D.
Access

 (1)  
Location Zone 567 Outboard Flap Track Fairing, Outboard Flap, LH, (Track No. 1) 565 Inboard Flap Track Fairing, Outboard Flap, LH, (Track No. 2) 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) 665 Inboard Flap Track Fairing, Outboard Flap, RH, (Track No. 7)

 667  Outboard Flap Track Fairing, Outboard Flap, RH, (Track No. 8)
 E. Procedure
 S 016-016
 (1)  
Do the applicable task: "Inboard Flap Track Fairing Removal" (Ref 27-51-26/401) or "Outboard Flap Track Fairing Removal" (Ref 27-51-31/401).

 S 866-017

 (2)  
Do this task to pressurize hydraulic systems No. 1 and 4: "Pressurize Hydraulic Systems" (Ref 29-11-00/201).

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747-400 MAINTENANCE MANUAL
 S 866-049
 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.
 (3)  
Put the flap control lever in the UP detent to retract the flaps.

 S 866-019

 (4)  
Do this task to depressurize hydraulic system No. 1 and 4: "Depressurize Hydraulic Systems" (Ref 29-11-00/201).

 S 496-020
 WARNING:_______MAKE SURE THE FLAPS ARE HELD IN THEIR POSITION. THE FLAPS CAN MOVE DOWN QUICKLY. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (5)  
Make sure the midflap stays in its position:

 (a)  
Attach the midflap to the structure or attach wood blocks with clamps to the flap track aft of the deadweight rollers on the forward bogie.

 S 496-021
 CAUTION: MAKE SURE THE ANGLE BETWEEN THE TRANSMISSION AND THE BALL SCREW
_______
 CENTERLINES IS NOT MORE THAN 10 DEGREES. TO THE UNIVERSAL JOINT. YOU CAN CAUSE DAMAGE
 (6)  Install the ball and screw support tool.
 (7)  S 036-022Remove the gimbal caps: (a) Remove the four bolts that connect the gi gimbal. (b) Remove the gimbal caps from the ball scre mbal caps and thew nut.
 (8)  S 486-023Attach the test fixture to the ball screw nut  and the ball screw.
 (9)  S 486-024Attach a dial indicator.
 S 226-025

 (10)
 Use the dial indicator to measure the backlash between the ball screw nut and the ball screw:

 (a)  
Measure the backlash with the ball screw nut in the flaps up position.

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747-400 MAINTENANCE MANUAL
 (b)  
Measure the backlash with the ball screw nut in the 25-unit position.

 (c)  
Measure the backlash with the ball screw nut in many positions between the up and the 25-unit positions.

 (d)  
Make sure the backlash dimensions are in the tolerance shown on Fig. 601.

 S 086-026
 (11)
 Remove the dial indicator.

 S 086-027

 (12)
 Remove the test fixture.

 S 436-028

 (13)
 Do this task to install the gimbal caps:  "Ball Screw Installation" (Ref 27-51-41/401).

 S 096-029

 (14)
 Remove the ball and screw support tool.

 S 096-030

 (15)
 Remove the tools that hold the midflap.

 S 416-031

 (16)
 Do the applicable task:  "Inboard Flap Track Fairing Installation" (Ref 27-51-26/401) or "Outboard Flap Track Fairing Installation" (Ref 27-51-31/401).
　
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