S 864-004

 (6)  
Release the pressure in hydraulic systems No. 1 and 4 (Ref 29-11-00/201).

 S 864-008

 (7)  
Move the flaps electrically to put the carriage in the correct position.

 (a)  
For the outboard flaps, the carriage must be approximately 1.95 inches forward of the fully down position.

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747-400 MAINTENANCE MANUAL
 (b) For the inboard flaps, the carriage must be approximately
 7.85 inches (19.9 cm) forward of the fully down position.
 S 864-048
 (8)  
Do the T.E. flap deactivation procedure (AMM 27-51-00/201).

 S 864-010

 (9)  
Remove the electrical power (AMM 24-22-00/201).

 S 494-011
 CAUTION:_______DO NOT MOVE THE FLAPS AFTER YOU INSTALL ONE FLAP LOCK. IF YOU CANNOT INSTALL THE SECOND LOCK, REMOVE THE FIRST LOCK. YOU CAN CAUSE DAMAGE TO THE FLAP DRIVE MECHANISM.
 (10)
 Install a lock on each flap carriage of the flaps in the flap set (inboard or outboard) where the torque tube is to be removed.

 (a)  
Adjust the tool to the specified length.

 (b)  
Loosen the roller lock screws until the roller hook openings are clear.

 (c)  
Attach a safety cable to the airplane structure.

 (d)  
Put the hooks on the deadweight rollers of the forward bogie.

 (e)  
Adjust the roller lock screws to touch the rollers.

 (f)  
Adjust the flap position or the tool length to make sure you can put the pin thru the tool into the failsafe bar.

 NOTE: On the inboard flaps, engage the pinball feature and the
____ top of the bushings with a 1.00 inch (2.54 cm) clearance between the tool and the failsafe bar. If the tool is adjusted too much on flap tracks No. 1, 3, 6 or 8, you cannot install the pin.
 (g)  
Tighten the star knob. Make sure that the serrations engage.

 E.
Remove the Flap Torque Tube (Fig. 401)

 S 034-013
 (1)  
Remove the torque tube supports.

 (a)  
Remove the torque tube safety straps, if they are installed.

 (b)  
Remove the center bearing from the structure, if it is installed.

 (c)  
Remove each half of the spline coupling cover, if they are installed.

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(EXAMPLE) DSEE SAFETY STRAP 
SEE  E 
SEE  A 
TIRE BURST BRACKET (EXAMPLE) SEE F  (EXAMPLE) CSEE SUPPORT BEARING 
TORQUE TUBE 
FWD  (EXAMPLE) BSEE ANGLE GEARBOX  A 
Figure 401 (Sheet 1) Flap Torque Tube Installation 

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MAINTENANCE MANUAL

SCREW
TORQUE TUBE  ANGLE GEARBOX  A  SPLINE  TORQUE TUBE 
A  SPLINE COUPLING SLEEVE 
OUTBD  FWD 
B ANGLE GEARBOX (EXAMPLE) 
BEARING SUPPORT  TUBE TORQUE 

SUPPORT BEARING (EXAMPLE)
C

Flap Torque Tube Installation
Figure 401 (Sheet 2)

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