C.  
This procedure gives the instructions to do a check of the Flap Ballscrew Backlash.

 TASK 27-51-73-206-001
 2.  Flap Ballscrew Inspection
_________________________
 A.  Standard Tools and Equipment
 (1)  
Micrometer - 0 to 1 inch

 (2)  
Vernier Caliper

 (3)  
C27030-33 - Flap Screw Backlash Tool

 B.  
References

 (1)  
AMM 27-51-73/401, Flap Ballscrew

 C.  
Access

 (1)  
Location Zone 307, 407 Wing Trailing Edge Outboard Flap and Spoiler 309, 409 Wing Trailing Edge Inboard Flap and Spoiler

 D.  
Procedure

 S 226-002
 (1)  
Remove the parts at each transmission of the outboard trailing edge flaps (AMM 27-51-73/401).

 (a)  
Put the flap control lever at the 25 unit position (there will be tension at the ballscrew).

 (b)  
Install the backlash test tool, C27030-33. 1) Install the clamp on the shaft of the ballscrew.

 NOTE: Use the lever tool to put the clamp in position
____ on the shaft.
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A
737-300/400/500MAINTENANCE MANUAL
 2) To keep the clamp in position, apply a maximum of 100 inch
 pounds of torque to the locking bolt.
 3) Install the magnetic dial indicator.
 4) Make sure the dial indicator is at 0.
 5) Install the lever tool.
 6) Apply 40 - 80 pounds to the handle of the lever tool.
 NOTE: When you apply the load to the handle of the
____ lever tool, it causes a 800 pound axial load at the ballnut.
 7) Make sure there is less than 0.0095 inches of axial
 backlash between the ballnut and the screw.
 a) If there is more than 0.0095 inches of axial backlash,
 remove and replace the units that are not in tolerance.
 (c)  
Disconnect the gimbal from the fitting on the midflap

 (d)  
Disconnect the ball nut from the gimbal

 (e)  
Do a check of the wear surfaces of the parts with a micrometer or vernier caliper as applicable (Fig. 601).

 (f)  
Compare the dimensions measured with the permitted dimensions shown in Fig. 601.

 (g)  
Repair or replace the parts that are not in the tolerance specified in Fig. 601.

 (h)  
Connect the ball nut to the gimbal

 (i)  
Connect the gimbal to the fitting on the midflap

 S 226-003
 (2)  
Remove the parts at each transmission of the inboard trailing edge flaps (AMM 27-51-73/401).

 (a)  
Put the flap control lever at the 25 unit position (there will be tension at the ballscrew).

 (b)  
Install the backlash test tool, C27030.
 1) Install the clamp on the shaft of the ballscrew.

 NOTE: Use the lever tool to put the clamp in position
____
 on the shaft.

 2) To keep the clamp in position, apply a maximum of 100 inch
 pounds of torque to the locking bolt.
 3) Install the magnetic dial indicator.
 4) Make sure the dial indicator is at 0.
 5) Install the lever tool.
 6) Apply 40 - 80 pounds to the handle of the lever tool.
 NOTE: When you apply the load to the handle of the
____ lever tool, it causes a 800 pound axial load at the ballnut.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

MIDFLAP FITTING
MIDFLAP FITTING BUSHING/GIMBAL
3. FLANGED
BUSHING/GIMBAL

INBD
FLANGED BUSHING (2 LOCATIONS)

A-A

Flap Ballscrew Wear Limits
Figure 601 (Sheet 1)

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