(a)
The removal of the torque tube (if it is necessary)

 (b)
The repair of the torque tube

 (c)
The application of alodine and primer to the torque tube

 (d)
The installation of the torque tube (if it is necessary).

 (2)
The task to make a splice for the torque tube has these parts:

 (a)
The removal of the torque tube

 (b)
The preparation of a splice fitting

 (c)
The installation of the splice fitting

 (d)
An inspection of the torque tube

 (e)
The application of the primer to the torque tube

 (f)
The installation of the torque tube.

 (3)
The task to install a torque tube coupling has these parts:

 (a)
The application of the primer to the surfaces

 (b)
The installation of the torque tube coupling.

 C.  
You can use this procedure to make a splice in a torque tube to replace a section or to make a torque tube longer.

 D.  
A splined coupling can be installed at the end of a torque tube when a new torque tube is being made or after a torque tube repair.

 TASK 27-51-20-308-022
 2.  Flap Torque Tube Repair
_______________________
 A.  Consumable Materials
 (1)
C00000 Alodine

 (2)
C00259 Enamel - Primer, Green, BMS 10-11

 B.  
References

 (1)
AMM 27-51-20/401, Flap Torque Tube

 (2)
AMM 51-21-04/701, Alodized Surfaces

 C.  
Access

 (1)  
Location Zone 135 Wing Landing Gear Wheel Well, LH 136 Wing Landing Gear Wheel Well, RH 572 Landing Gear Support Beam and Rear Spar to Trailing Edge,

 LH 672 Landing Gear Support Beam and Rear Spar to Trailing Edge,
 RH 581 Rear Spar to Trailing Edge, LH 681 Rear Spar to Trailing Edge, RH
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-51-20
 ALL  ú ú 01 Page 801 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 D. Procedure
 S 028-001
 (1)  
Remove the torque tube from the airplane, if it is necessary to get access (AMM 27-51-20/401).

 S 328-002

 (2)  
Repair the defects to a minimum blend radius of 1.00 inch (2.54 cm).

 NOTE: The surface finish of the area must be 63 microinch
____
 (1.6 microns) or better. The permitted defect depth must be in the limit shown in the table. If there are two or more defects, they must be a minimum of 1-1/2 times the diameter of the torque tube apart.
 ~......................................................................... | | PERMITTED DEFECT DEPTH | | DEFECT DESCRIPTION | AFTER REWORK - INCHES | ........................................................................... | | TUBE OD - INCHES (CM) | ........................................................................... | | 1.25 1.50 1.75 2.00 | | | (3.18) (3.81) (4.45) (5.08) | 2.........................................…...............................1
 ~......................................................................... | AN EXTENDED DEFECT - MORE THAN 30% OF | 0.015 0.010 0.006 0.004 | | THE TUBE CIRCUMFERENCE (HELICAL OR |(0.038) (0.025) (0.015) (0.010) | | CIRCULAR) OR MORE THAN 3.0 INCHES LONG | | 2........................................…................................1 ~......................................................................... | A LOCAL DEFECT - LESS THAN 30% OF THE | 0.025 0.020 0.010 0.008 | | TUBE CIRCUMFERENCE AND LESS THAN 3.0 |(0.064) (0.051) (0.025) (0.020) | | INCHES LONG | | 2........................................…................................1
 S 378-003
 (3)
Apply a layer of alodine to the repaired area (AMM 51-21-04/701).

 (4)  
Apply the primer to the repaired area.

 (5)
Install the torque tube if it was removed (AMM 27-51-20/401).

 S 378-004
 S 428-005
 TASK 27-51-20-308-023
 3.  Flap Torque Tube Splice_______________________
 A. Standard Tools and Equipment
 (1)  
Bolts - NAS1104 (length per Fig. 801) (12 necessary)

 (2)  
Nuts - NAS679A4 (or equivalent) (12 necessary)
　
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