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9/27/01 AC 43.13-1B CHG 1 9-21. WHEEL INSTALLATION. Various procedures are used for installing wheel as- semblies on an aircraft. a. The axle should first be cleaned and in- spected for surface damage, damage to the axle threads, and the general condition and security of bolts holding the axle onto the landing-gear leg. The wheel bearings should be cleaned and packed with approved grease. The wheel bearing and tire must be inspected and assem- bled. Many aircraft have specific torque re- quirements for the wheel-retaining nuts. These torque requirements may have two values specified. The retaining nut is first tightened to the higher value to seat the bearing. It is then backed off and tightened to the lower value specified. While tightening the wheel retaining nuts, the wheel should be rotated. b. Great care should be exercised to see that the wheel-retaining nuts are not over- tightened. In the absence of specific instruc- tions, the wheel-retaining nut is tightened until bearing drag is felt. The nut is then backed off about one serration (castellation) or one-sixth turn before bending up the tab on the tab-lock washer or installing the cotter pin. c. The grease cover or wheel cover, if used, is then installed. During this installation any required brake, air-pressure sensors, and speed-sensor components should be installed and connected, as appropriate, for the specific aircraft. 9-22.9.24. [RESERVED.] Par 9-9 Page 9-12a (and 9-12b)PDF Image | AFS-640
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