(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.
 (f)
Tighten the star knob. Make sure the serrations engage.

 F.  
Remove the Transmission

 S 974-008
 (1)  Measure and write down dimension Y (Fig. 402, view D), for all four transmissions of the flap set where the transmission is to be replaced.
 NOTE: You will use these dimensions to make sure that the
____ replacement transmission is correctly adjusted.
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A

747-400
MAINTENANCE MANUAL

SEE A
SEE F
1. TRANSMISSION
B
A

B
BALL SCREW
A  SEEB C
SEE E
MIDFLAP
A
5. BOLT
24. BOLT 4. WASHER
25. WASHER 3. WASHER
26. WASHER
2. NUT
2. NUT
GIMBAL
1. TRANSMISSION BALL SCREW
UNIVERSAL JOINT DOWNSTOP
DIMENSION X
SEE D

FWD
BALL SCREW NUT
DIMENSION Y SEE D
OUTBOARD FLAPS
B
Transmission Installation Figure 402 (Sheet 1)
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A

747-400
MAINTENANCE MANUAL

GIMBAL UNIVERSAL JOINT
5. BOLT
4. WASHER MIDFLAP
3. WASHER
2. NUT
1. TRANSMISSION
DIMENSION X BALL SCREW
SEE D DOWNSTOP
FWD
BALL SCREW NUT
DIMENSION Y
SEE D
INBOARD FLAPS
C

DIMENSION X OR Y
STOP
D
Transmission Installation Figure 402 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400
MAINTENANCE MANUAL

FOR TRANSMISSIONS NO. 3 AND 6
A-A

Transmission Installation
Figure 402 (Sheet 3)

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A
747-400
MAINTENANCE MANUAL

1. TRANSMISSION
FOR TRANSMISSIONSFOR TRANSMISSIONS 4 AND 5 NO. 3 AND 6
B-B B-B
Transmission Installation Figure 402 (Sheet 4)
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