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(1) Install the dial indicator assembly on the ballscrew:
NOTE: The dial indicator assembly is a part of the tester, SPL-1753.
(a) Put the dial indicator assembly on the ballscrew.
NOTE: Make sure the pointer touches the forward end of the ballscrew nut.
(b) Put the strap around the ballscrew to help hold the dial indicator assembly on the
ballscrew.
(c) Adjust the dial indicator to zero.
SUBTASK 27-51-42-220-001
(2) Measure the backlash of the ballscrew and ballscrew nut:
(a) Push up on the outboard trailing edge of the outboard flap.
NOTE: This will apply a load to the ballscrew nut, and move it forward on the ballscrew.
(b) Use the dial indicator to measure the movement of the ballscrew nut.
NOTE: The movement of the ballscrew nut is the backlash.
(c) Do these steps a total of five times to make sure the movement of the dial indicator is
repeatable.
SUBTASK 27-51-42-960-001
(3) If the backlash is more than 0.0073 inch (0.185 millimeter), then replace the ballscrew assembly.
These are the tasks:
Outboard Flap Outboard Ballscrew and Gimbal Removal, TASK 27-51-42-000-801,
Outboard Flap Outboard Ballscrew and Gimbal Installation, TASK 27-51-42-400-801.
SUBTASK 27-51-42-080-001
(4) Remove the dial indicator assembly from the ballscrew.
SUBTASK 27-51-42-440-003
(5) Do this task: Trailing Edge Flap System Reactivation, TASK 27-51-00-440-801.
SUBTASK 27-51-42-860-012
(6) Retract the trailing edge flaps to the retracted position, do this task: Retract the Trailing Edge
Flaps, TASK 27-51-00-860-804.
G. Outboard Flap Outboard Ballscrew Backlash Check With the Lever and Clamp Tool
NOTE: With this method, you use the lever and clamp tool to apply the load to the ballscrew nut.
SUBTASK 27-51-42-010-003
(1) Do this task: Outboard Flap Outboard Support Aft Fairing Removal, TASK 27-51-28-000-802.
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SUBTASK 27-51-42-440-004
(2) Do this task: Trailing Edge Flap System Reactivation, TASK 27-51-00-440-801.
SUBTASK 27-51-42-860-013
(3) Retract the trailing edge flaps to the 15-unit position, do this task: Retract the Trailing Edge
Flaps, TASK 27-51-00-860-804.
SUBTASK 27-51-42-040-004
(4) Do this task: Trailing Edge Flap System Deactivation, TASK 27-51-00-040-801.
SUBTASK 27-51-42-480-002
(5) Install the lever and clamp tool on the ballscrew:
NOTE: The lever and clamp tool is a part of the tester, SPL-1753.
(a) Put the lever and clamp tool in its position on the ballscrew aft of the ballscrew nut.
NOTE: Make sure the load surfaces of the lever and clamp tool touch the aft side of the
ballscrew nut.
(b) Tighten the clamp-up bolt to 200-300 pound-inches (22.6-33.8 newton-meters).
NOTE: Make sure the handles of the lever and clamp tool are in the relaxed position.
SUBTASK 27-51-42-480-003
(6) Install the dial indicator assembly on the ballscrew:
NOTE: The dial indicator assembly is a part of the tester, SPL-1753.
(a) Put the dial indicator assembly on the ballscrew.
NOTE: Make sure the pointer touches the forward end of the ballscrew nut.
(b) Put the strap around the ballscrew to help hold the dial indicator assembly on the
ballscrew.
(c) Adjust the dial indicator to zero.
SUBTASK 27-51-42-220-002
(7) Measure the backlash of the ballscrew and ballscrew nut:
(a) Move the handles of the lever and clamp tool together until the dial indicator stops.
NOTE: This will apply a load to the ballscrew nut, and move it forward on the ballscrew.
(b) Use the dial indicator to measure the movement of the ballscrew nut.
NOTE: The movement of the ballscrew nut is the backlash.
(c) Do these steps a total of five times to make sure the movement of the dial indicator is
repeatable.
SUBTASK 27-51-42-960-002
(8) If the backlash is more than 0.0073 inch (0.185 millimeter), then replace the ballscrew assembly.
These are the tasks:
Outboard Flap Outboard Ballscrew and Gimbal Removal, TASK 27-51-42-000-801,
Outboard Flap Outboard Ballscrew and Gimbal Installation, TASK 27-51-42-400-801.
SUBTASK 27-51-42-080-002
(9) Remove the dial indicator assembly and the lever and clamp tool from the ballscrew.
SUBTASK 27-51-42-410-003
(10) Do this task: Outboard Flap Outboard Support Aft Fairing Installation, TASK 27-51-28-400-802.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL 27-51-42
Page 603
Jun 10/2004
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
　
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