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A
747-400
MAINTENANCE MANUAL

INBOARD TE FLAPS

OUTBOARD TE FLAPS
Flap Lock Installation Figure 401
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747-400 MAINTENANCE MANUAL
 (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 through the tool into the failsafe bar.
 NOTE:____ If you adjust the tool too much at flap track location
 number 2, or 7, you cannot install the pin at flap track
 location number 1 or 8.
 (g)  Tighten the star knob.  Make sure the serrations engage.

 S 944-038
 CAUTION: DO NOT MOVE THE INBOARD FLAPS AFTER YOU INSTALL ONE FLAP LOCK.
_______ IF YOU CANNOT INSTALL THE SECOND LOCK, REMOVE THE FIRST LOCK BEFORE YOU READJUST THE FLAPS. YOU CAN CAUSE DAMAGE TO THE FLAP DRIVE MECHANISM.
 (5)  
If you will remove the ball screw at flap track location 3, 4, 5 or 6, install the inboard trailing edge flap lock on the carriage of the inboard trailing edge flap at the location of the ball screw that will be removed.

 (a)  
Adjust the tool to the correct length.

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

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

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

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

 NOTE: Engage the pin ball-lock feature and the top of the
____ bushing, with a 1.00 inch (25.4 mm) clearance between the tool and the failsafe bar. If you adjust the tool too much at flap track location number 4 or 5, you cannot install the pin at flap track location number 3 or 6.
 1)  Insert the pin through the forward hole of the lock at flap track location number 4 or 5, and the aft hole of the lock at flap track location number 3 or 6. Slide the pin through the bushed hole in the bottom of the track failsafe bar.
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747-400 MAINTENANCE MANUAL
 (f)
Tighten the star knob. Make sure the serrations engage.

 F.
Remove the Ball Screw

 S 934-010
 (1)  Measure and write down the dimension Y, as shown on Fig. 402, on all four transmissions of the flap set where you will replace the ball screw (9).
 NOTE: You will use these dimensions to make sure you correctly
____
 install the replacement ball screw.

 S 934-011
 (2)  Make an index mark of the position of the ball screw and the universal joint.
 NOTE: The index marks will make sure you install the ball screw to
____
 the universal joint correctly.

 S 494-012
 CAUTION: MAKE SURE THE ANGLE BETWEEN THE TRANSMISSION AND THE BALL SCREW
_______ CENTERLINES IS NOT MORE THAN 10 DEGREES. YOU CAN CAUSE DAMAGE TO THE UNIVERSAL JOINT.
 (3)
Install the ball and screw support tool to hold the ball screw.

 S 024-013

 (4)  
Remove the ball screw (Fig. 402):

 (a)  
Remove the two bolts (1), washers (2 and 3), and nuts (4) that attach the ball screw to the universal joint.

 (b)  
On the outboard flap tracks, remove the four bolts (10) and washers (8) that connect the gimbal caps (7).

 NOTE: The gimbal retainer (5) and nut (6) must stay in the
　
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