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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 FLAP TORQUE TUBE - INSPECTION/CHECK
___________________________________
 1.  General
_______
 A.  There is one task in this procedure to do an inspection of the flap torque tubes.
 B.  AIRPLANES WITH ELECTROMAGNETIC FORMING (EMF) END FITTINGS; No play is permitted on EMF end fittings. If the end fittings do become loose, replace the torque tube (AMM 27-51-20/401).
 (1)
The inspection of the flap torque tubes has these parts:

 (a)
The extension of the flaps

 (b)
The installation of the landing gear door locks

 (c)
An inspection of the backlash at the couplers

 (d)
A measurement of the center bearing sleeves

 (e)
A visual check of the air sealer

 (f)
The retraction of the flaps

 (g)
The removal of the landing gear door locks.

 TASK 27-51-20-206-001
 2.  Flap Torque Tube Inspection
___________________________
 A.  References
 (1)
AMM 27-51-20/401, Flap Torque Tube

 (2)
AMM 27-51-20/801, Flap Torque Tube

 (3)
AMM 29-11-00/201, Main Hydraulic Supply System

 (4)
AMM 32-00-30/201, Landing Gear Door Locks

 B.  
Access

 (1)  
Location Zone 135 Wing Landing Gear 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
 C.  Prepare for the Inspection
 S 866-002
 (1) Pressurize hydraulic systems No. 1 and 4 (AMM 29-11-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 866-015
 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 flaps.

 S 866-004

 (3)  
Release the pressure in hydraulic systems No. 1 and 4
 (AMM 29-11-00/201).

 S 866-005

 (4)  
Make sure that the landing gear ground locks are installed.

 S 496-006
 WARNING: CAREFULLY DO THE SPECIFIED TASK TO INSTALL THE DOOR LOCKS ON
_______ THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (5)  
Install the door locks on the doors for the body landing gear (AMM 32-00-30/201).

 D.
Torque Tube Inspection

 S 226-007
 (1)  
Examine the flap torque tube splined couplers (Fig. 601):

 (a)  
Remove the screws which attach the spline coupling sleeve to the torque tube on the opposite end of the torque tube.

 (b)  
Move the coupling sleeve off the torque tube spline to disconnect the torque tube.

 (c)  
Measure the linear and the angular backlash.

 NOTE: Move the torque tube axially, the full length of the
____ sleeve to find the point of maximum backlash.
 (d)  Replace the gearbox if the backlash is not in the tolerance (AMM 27-51-20/401).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-51-20
 ALL  ú ú 01 Page 602 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

SCREW  SPLINE COUPLING 
ANGLE  SLEEVE  TORQUE TUBE 
　
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