F.
Put the Airplane Back to Its Usual Condition

 S 866-032
 (1)  
Do this task to pressurize hydraulic systems No. 1 and 4: "Pressurize Hydraulic Systems" (Ref 29-11-00/201).

 S 866-033

 (2)  
Put the flap control lever to the UP detent to retract the trailing edge flaps.

 S 866-034

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

 TASK 27-51-41-206-050
 5.  Ball Screw Backlash Inspection (Without the Test Fixture)_________________________________________________________
 A. Special Tools and Equipment
 (1)  
24ME65B00116 Inboard TE Flap Lock

 (2)  
23ME65B00116 Outboard TE Flap Lock

 (3)  
2M1T65B81117-1 Ball and Screw Support Tool

 B.
Standard Tools and Equipment

 (1)  
Dial Indicator

 (2)  
Scale - Spring, 0 to 100 pound

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 27-51-41
 ALL  ú ú 01 Page 608 ú Feb 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

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

 (2)  
27-51-31/401, Outboard Flap Track Fairings

 (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 866-035
 (1)  Do this task to pressurize hydraulic systems No. 1 and 4:
 "Pressurize Hydraulic Systems" (Ref 29-11-00/201).

 S 866-051
 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.
 (2)  
Put the flap control lever in the 30-unit detent to extend the trailing edge flaps and attach a DO-NOT-MOVE tag.

 S 866-037

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

 S 016-038

 (4)  
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).

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 ALL  ú ú 01 Page 609 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 F. Install the flap lock tools onto the flap carriage (Fig. 602):
 S 866-054
 (1)  
Move the flaps electrically until the carriage is in the correct position:

 (a)
For the outboard flaps, the carriage must be approximately

 1.95 inches forward of the full down position.
 (b) For the inboard flaps, the carriage must be approximately
 7.85 inches forward of the full down position.
 S 866-055
 (2)  Do this task: "Remove Electrical Power" (Ref 24-22-00/201).
 S 946-056
 CAUTION: DO NOT MOVE THE OUTBOARD FLAPS AFTER YOU INSTALL ONE FLAP LOCK.
　
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