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AC 43.13-1B CHG 1 Do not pry between wheel flanges and tire beads as this can damage the wheel and tire. Use caution when removing wheel bolts or nuts. Remove tire from wheel using a wheel de- mounting fixture. Valve stem, fusible plugs, wheel keys, heat shields, balance weights, and associated hard- ware should not be removed if demountable flange only is to be removed for tire change. Fusible plugs and bearing cups should not be removed unless replacement is necessary, if paint is to be stripped, or if a thorough inspec- tion of the wheel is to be made. When removal and replacement of fusible plugs is required, remove by pressing out with a blunt instrument such as a wooden rod. Ex- ercise caution to ensure wheel sealing surfaces are not damaged. 9-18. REASSEMBLING THE WHEEL. The correct assembly of the wheel affects the balance of the tire. After the wheel halves and bolts/nuts have been inspected and found serviceable, put a little talc on the tube and in- sert it in the tire. Align the heavy spot of the tube (usually marked with a yellow line) with the light spot of the tire (usually marked with a red dot). If the tube does not have a balance mark, align the valve of the tube with the bal- ance mark on the line. Remove the valve core and inflate the tube momentarily to “seat” the tube and let the air run out. Put one wheel half in the tire and align the wheel half with the valve hole up with the valve on the tube. In- sert the other wheel half in the tire and align the bolt holes. Insert the wheel bolts and torque to the manufacturer’s recommended value. 9/27/01 NOTE: It is highly recommended that the tire be placed in a cage so that if the wheel fails, the mechanic is pro- tected from injury. Again inflate the tube with 5 or 10 psi and let the air out to re-seat the tube. Install the valve core, and fill the tire to the recommended pres- sure. 9-19. SLIPPAGE. To reduce the possibility of tire and tube failure due to slippage, and to provide a means of detecting tire slippage, tires should be marked and indexed with the wheel rim. Paint a mark one inch wide and two inches long across the tire side wall and wheel rim. Use a permanent type paint in a con- trasting color, such as white, red, or orange. Pre-flight inspection must include a check of slippage marks for alignment. If the slippage marks are not in alignment, a detailed inspec- tion must be made, the reason determined, and if necessary, the condition corrected before the next flight. NOTE: Mechanics should be aware that retread tires can be diametrically bigger than a “new” tire. While this does not pose a problem on fixed landing gear aircraft, it may pose a problem on retractable gear aircraft. Due to a 5 to 8 percent expansion of the tire caused by the ambient tem- perature, if a retread tire is installed on a retractable gear aircraft, it is strongly recommended that a retrac- tion test be performed. This is to en- sure the tire will not become wedged in the wheel well during take-off and landing operation. 9-20. WHEEL INSPECTION. Check wheels for damage. Wheels that are cracked or damaged must be taken out of service for re- pair or replacement in accordance with the manufacturer’s instruction manual. Page 9-12 Par 9-18PDF Image | AFS-640
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