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9/27/01 AC 43.13-1B CHG 1 ing of components and related tubing or wir- ing. This could interfere with the travel of the gear door actuating mechanisms. e. Wheels. Inspect the wheels periodi- cally for cracks, corrosion, dents, distortion, and faulty bearings in accordance with the manufacturer’s service information. In split- type wheels, recondition bolt holes which have become elongated due to some play in the through-bolt, by the use of inserts or other FAA-approved means. Pay particular attention to the condition of the through-bolts and nuts. Carefully inspect the wheels used with tubeless tires for damage to the wheel flange and for proper sealing of the valve. The sealing ring used between the wheel halves should be free of damage and deformation. When bolting wheel halves together, tighten the nuts to the proper torque value. Periodically accomplish an inspection to ensure the nuts are tight and that there is no movement between the two halves of the wheel. Maintain grease retaining felts in the wheel assembly in a soft, absorbent condition. If any have become hardened, wash them with a petroleum-base cleaning agent; if this fails to soften them, they should be re- placed. (1) Corrosion of wheels. Remove all corrosion from the wheel half, and inspect it to ensure that the wheel halves are serviceable. Apply corrosion prevention treatments as ap- plicable. Prime with a zinc chromate primer or equivalent, and apply at least two finish coats. (2) Dented or distorted wheels. Re- place wheels which wobble excessively due to deformation resulting from a severe side-load impact. In questionable cases, consult the lo- cal representative of the FAA concerning the airworthiness of the wheels. Minor dents do not affect the serviceability of a wheel. (3) Wheel bearings. When inspecting wheel bearings for condition, replace damaged or excessively worn parts. Maintain bearings and races as matched sets. Pack bearings only with the grease type called for in the manu- facturer’s maintenance manual prior to their installation. Avoid pre-loading the wheel bearing when installing it on the aircraft by tightening the axle nut just enough to prevent wheel drag or side play. f. Brakes. Disassemble and inspect the brakes periodically and examine the parts for wear, cracks, warpage, corrosion, elongated holes, etc. Discolored brake disks are an indi- cation of overheated brakes and should be re- placed. If any of these or other faults are indi- cated, repair, recondition, or replace the af- fected parts in accordance with the manufac- turer’s recommendations. g. Hydraulic Brakes. For proper mainte- nance, periodically inspect the entire hydraulic system from the reservoir to the brakes. Maintain the fluid at the recommended level with proper brake fluid. When air is present in the brake system, bleed in accordance with the manufacturer’s instructions. Replace flexible hydraulic hoses which have deteriorated due to long periods of service and replace hydraulic piston seals when there is evidence of leakage. h. Micro-Switches. Inspect micro- switches for security of attachment, cleanli- ness, general condition, and proper operation. Check the associated wiring for chafing, proper routing, and to determine that protec- tive covers are installed on wiring terminals, if required. Check the condition of the rubber dust boots which protect the micro-switch plungers from dirt and corrosion. 9-8. FLOATS AND SKIS. Aircraft oper- ated from water may be provided with either a single float or a double float, depending upon the design and construction; however, if an aircraft is an amphibian, it has a hull for flota- tion and then may need only wingtip floats. Par 9-7 Page 9-5PDF Image | AFS-640
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