S 866-010

 (3)  
Do this task to depressurize hydraulic systems No. 1 and 4: "Depressurize Hydraulic Systems" (Ref 29-11-00/201).

 TASK 27-51-41-206-011
 3.  Bushing and Trunnion Inspection (Fig. 601)_______________________________
 A. Standard Tools and Equipment
 (1)  
Micrometer - 1 to 2 inch, For Inner Dimensions

 (2)  
Micrometer - 1 to 2 inch, For Outer Dimensions

 (3)  
Vernier Caliper

 B.
References

 (1)  
27-51-41/401, Ball Screw

 C.
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)
 D. Procedure
 S 026-012
 (1)  
Do this task: Ball Screw Removal" (Ref 27-51-41/401).

 S 226-013

 (2)  
Examine the bushing and the trunnion for worn areas:

 (a)  
Remove the parts.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

BALL SCREW
SEE A
1.
 BUSHING/ TRUNNION

2.
 BALL SCREW NUT BALL SCREW

A
NOTE: BALL SCREW NO. 1 SHOWN BALL SCREW NO. 2 THRU NO. 8 SIMILAR
Ball Screw Wear Limits Figure 601 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

BALL SCREWS NO. 1,2,7,8  BALL SCREWS NO. 4 AND 5 
BALL SCREWS NO. 1 AND 8 BALL SCREWS NO. 3,4,5,6 
 A WORN PART IS REPAIRABLE. REFER TO THE VENDOR OVERHAUL MANUAL FOR THE REPAIR INFORMATION. 
BALL SCREWS NO. 3 AND 6 BALL SCREWS NO. 2 AND 7 
 MEASURE THE LONGITUDINAL BACKLASH BETWEEN THE BALL SCREW NUT AND THE BALL SCREW. REFER TO PAR. 4 OR 5 FOR A TASK TO MEASURE THE BACKLASH. 

Ball Screw Wear Limits
Figure 601 (Sheet 2)

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 ALL  ú ú 01 Page 605 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b)  
Use a micrometer or a vernier caliper to measure the parts.

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

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

 S 426-014
 (3) Do this task: "Ball Screw Installation" (Ref 27-51-41/401).
 TASK 27-51-41-206-015
 4.  Ball Screw Backlash Inspection (With the Test Fixture)______________________________________________________
 A. Special Tools and Equipment
 (1)  
CF65B81117 TE Flap Drive Ball Nut Test Fixture

 (2)  
2MIT65B81117-1 Ball and Screw Support Tool

 B.
Standard Tools and Equipment

 (1)  
Dial Indicator

 C.
References

 (1)  
27-51-26/401, Inboard Flap Track Fairings

 (2)  
　
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