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INBOARD FLAP BALLSCREWS AND GIMBALS - INSPECTION/CHECK
1. General
A. This procedure has these tasks:
(1) A check of the backlash in the outboard ballscrew for the inboard flap
(2) A check of the backlash in the inboard ballscrew for the inboard flap.
TASK 27-51-32-220-801
2. Inboard Flap Outboard Ballscrew Inspection
(Figure 601)
A. General
(1) This task is applicable to the ballscrew at flap supports No. 3 and 6.
B. References
Reference Title
27-51-00-040-801 Trailing Edge Flap System Deactivation (P/B 201)
27-51-00-440-801 Trailing Edge Flap System Reactivation (P/B 201)
27-51-00-860-803 Extend the Trailing Edge Flaps (P/B 201)
27-51-00-860-804 Retract the Trailing Edge Flaps (P/B 201)
27-51-18-000-802 Inboard Flap Support Aft Fairing Removal (P/B 401)
27-51-18-400-802 Inboard Flap Support Aft Fairing Installation (P/B 401)
27-51-32-000-801 Inboard Flap Outboard Ballscrew and Gimbal Removal (P/B 401)
27-51-32-400-801 Inboard Flap Outboard Ballscrew and Gimbal Installation (P/B 401)
C. Tools/Equipment
NOTE: When more than one tool part number is listed under the same "Reference" number, the
tools shown are alternates to each other within the same airplane series. Tool part numbers
that are replaced or non-procurable are preceded by "Opt:", which stands for Optional.
Reference Description
SPL-1753 Equipment - Test, Flap Screw Backlash
(Part #: C27030-49, Supplier: 81205, A/P Effectivity: 737-600, -700,
-700C, -700ER, -700QC, -800, -900, -900ER, -BBJ)
D. Location Zones
Zone Area
542 Left Wing - Fairing Flap Support No. 3
553 Left Wing - Inboard Flap
642 Right Wing - Fairing Flap Support No. 6
653 Right Wing - Inboard Flap
E. Prepare for the Inspection
SUBTASK 27-51-32-860-011
(1) Extend the trailing edge flaps to the 15-unit position. To extend them, do this task: Extend the
Trailing Edge Flaps, TASK 27-51-00-860-803.
SUBTASK 27-51-32-040-003
(2) Do this task: Trailing Edge Flap System Deactivation, TASK 27-51-00-040-801.
SUBTASK 27-51-32-010-002
(3) Do this task: Inboard Flap Support Aft Fairing Removal, TASK 27-51-18-000-802.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL 27-51-32
Page 601
Oct 10/2006
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
F. Inboard Flap Outboard Ballscrew Backlash Check
SUBTASK 27-51-32-480-001
(1) 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 to 33.8 newton-meters).
NOTE: Make sure the handles of the lever and clamp tool are in the relaxed position.
SUBTASK 27-51-32-480-002
(2) 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 27-51-32-220-001
(3) 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 27-51-32-960-001
(4) If the backlash is more than 0.0073 inch (0.185 millimeter), then replace the ballscrew assembly.
These are the tasks:
Inboard Flap Outboard Ballscrew and Gimbal Removal, TASK 27-51-32-000-801,
Inboard Flap Outboard Ballscrew and Gimbal Installation, TASK 27-51-32-400-801.
SUBTASK 27-51-32-080-001
(5) Remove the dial indicator assembly and the lever and clamp tool from the ballscrew.
G. Put the Airplane Back to Its Usual Condition
SUBTASK 27-51-32-410-002
(1) Do this task: Inboard Flap Support Aft Fairing Installation, TASK 27-51-18-400-802.
SUBTASK 27-51-32-440-003
(2) Do this task: Trailing Edge Flap System Reactivation, TASK 27-51-00-440-801.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL 27-51-32
　
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