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STABILIZER BALL NUT AND JACKSCREW GEARBOX - INSPECTION/CHECK
1. General
A. This procedure contains these tasks:
(1) Stabilizer Trim Ball Nut and Jackscrew Gearbox Detail Visual Inspection.
(2) Stabilizer Jackscrew Gearbox Backlash Inspection.
(3) Upper and Lower Gimbal Wear Limits Inspection.
(a) This task supplies the data for a dimensional inspection of the upper and lower gimbals.
(b) This task does not remove or install the stabilizer ball nut and jackscrew gearbox. Refer to
the Stabilizer Ball Nut and Jackscrew Gearbox - Removal/Installation for procedures to
remove and install the stabilizer ball nut and jackscrew gearbox.
TASK 27-41-81-210-801
2. Stabilizer Trim Ball Nut and Jackscrew Gearbox Detail Visual Inspection
(Figure 601)
A. References
Reference Title
12-22-41-600-801 Stabilizer Jackscrew, Ballnut and Gimbal - Lubrication (P/B 301)
27-41-81-000-801 Stabilizer Ball Nut and Jackscrew Gearbox Removal (P/B 401)
27-41-81-400-801 Stabilizer Ball Nut and Jackscrew Gearbox Installation (P/B 401)
B. Location Zones
Zone Area
311 Area Aft of Pressure Bulkhead - Left
C. Access Panels
Number Name/Location
311BL Stabilizer Trim Access Door
D. Procedure
SUBTASK 27-41-81-010-003
(1) Open this access panel:
Number Name/Location
311BL Stabilizer Trim Access Door
SUBTASK 27-41-81-210-001
(2) Do a detail visual inspection of the stabilizer trim jackscrew and upper and lower gimbals.
(a) Examine all attachment points for security and damage.
(b) Examine the upper and lower gimbals for cracks or damage.
(c) Examine cable drum and cables for damage or binding.
(d) Examine the electrical connectors of the stabilizer trim motor for damage.
(e) Examine the jackscrew and ballnut for signs of corrosion.
1) Look for metal debris on the grease or metallic dust particles on or around the
jackscrew and ballnut.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL 27-41-81
Page 601
Oct 10/2005
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
a) If you find any metal debris or corrosion, replace the stabilizer jackscrew actuator:
(Stabilizer Ball Nut and Jackscrew Gearbox Removal, TASK 27-41-81-000-801)
(Stabilizer Ball Nut and Jackscrew Gearbox Installation,
TASK 27-41-81-400-801).
NOTE: Metallic debris in the grease may indicate wears of the balls in the ballnut.
2) Examine the area above, on and around the jackscrew gearbox to see if grease is
coming out from the ballnut.
a) If you find large amount of grease, replace the stabilizer jackscrew actuator:
(Stabilizer Ball Nut and Jackscrew Gearbox Removal, TASK 27-41-81-000-801)
(Stabilizer Ball Nut and Jackscrew Gearbox Installation,
TASK 27-41-81-400-801).
NOTE: Large amount of grease around the the jackscrew gearbox may indicate a
faulty seal or raised return tube on the ballnut.
(f) Examine the following areas for ball bearings:
NOTE: The ball bearings dimension are 0.21875 inch (5.55625 millimeters) diameter.
1) If any ball bearings of this size are found in the following areas, replace the stabilizer
jackscrew actuator: (Stabilizer Ball Nut and Jackscrew Gearbox Removal,
TASK 27-41-81-000-801) (Stabilizer Ball Nut and Jackscrew Gearbox Installation,
TASK 27-41-81-400-801).
a) The exterior of the ballnut.
b) The jackscrew gearbox housing.
c) The area below and around the jackscrew gearbox housing.
(g) Examine the ballnut and ballnut return tubes for corrosion or signs of lifting from the
ballnut.
1) If there is any sign of damage, replace the stabilizer jackscrew actuator: (Stabilizer
Ball Nut and Jackscrew Gearbox Removal, TASK 27-41-81-000-801) (Stabilizer Ball
Nut and Jackscrew Gearbox Installation, TASK 27-41-81-400-801).
(h) Do a detailed inspection of the Ball Nut Tube Retainers and make sure they have no
damage (have no deformation and have no cracks), or are not lifted from the Ball Nut. If the
Ball Nut Tube Retainers are lifted, or if they have damage, replace the Stabilizer Trim
Actuator: (Stabilizer Ball Nut and Jackscrew Gearbox Removal, TASK 27-41-81-000-801)
(Stabilizer Ball Nut and Jackscrew Gearbox Installation, TASK 27-41-81-400-801).
(i) Examine the jackscrew.
1) Remove any old grease and dirt from the jackscrew threads.
NOTE: Use clean, dry, and non-abrasive cloth.
2) Check the jackscrew threads for cross-threading, distortion, stripping, metal debris,
gouging, corrosion, spalling or brinelling.
3) Check the jackscrew for obvious differences in thread shape between thread grooves
in the lower, middle, and upper portions of the jackscrew.
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737-600-700-800-900 AIRCRAFT MAINTENANCE MANUAL飞机维护手册4(11)
