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AC 43.13-1B 9/8/98 torquing procedures require all bolt threads to be dry, clean, and free of any lubrication be- fore torquing. b. Controllable Pitch. (1) Inspect controllable pitch propellers frequently to determine that all parts are lubri- cated properly. It is especially recommended that all lubrication be accomplished in accor- dance with the propeller manufacturer’s in- structions. (2) Complete inspection/servicing re- quires the removal of the spinner for examina- tion and servicing of the propeller hub and blade clamp area. All inspections and servic- ing of the pitch control mechanism should follow the recommendations of the propeller, engine, and airframe manufacturers. Propel- lers must be in compliance with applicable AD’s and manufacturer’s SB’s. (3) The hub, blade clamps, and pitch change mechanisms should be inspected for corrosion from all sources, including rain, snow, and bird droppings that may have en- tered through the spinner openings. Examine the hub area for oil and grease leaks, missing grease-fitting caps, and leaking or missing grease fittings. (4) Propeller domes should be checked for leaks, both at the seals and on the fill valve (if so equipped). The dome valve may be leak- tested by applying soapy water over the fill valve end. Domes should be serviced only with nitrogen or dry air in accordance with the manufacturer’s recommendations. When pro- peller domes are inspected and found filled with oil, the propeller should be removed and inspected/repaired by an appropriately-rated repair facility. (5) It is especially recommended that all lubrication be accomplished at the periods and in the manner specified by the propeller manu- facturer. On makes and models with a grease fitting on the hub, before greasing the hub re- move the grease fitting opposite the one to which you are going to add grease. This will allow the excess grease and pressure to exit through the grease fitting hole rather than the hub seal. (6) Fiber-block, pitch-change mecha- nisms should be inspected for deterioration, fit, and the security of the pitch-clamp forks. (7) Certain models of full-feathering propellers use spring-loaded pins to retain the feathered blade position. Spring and pin units should be cleaned, inspected, and relubricated per the manufacturer’s recommendations and applicable AD’s. (8) Pitch change counterweights on blade clamps should be inspected for security, safety, and to ensure that adequate counter- weight clearance exists within the spinner. 8-95. TACHOMETERINSPECTION. Due to the exceptionally high stresses that may be generated by particular propeller/engine combinations at certain engine revolutions per minute (RPM), many propeller and aircraft manufacturers have established areas of RPM restrictions and other restrictions on maximum RPM for some models. Some RPM limits do not exceed 3 percent of the maximum RPM permitted, and a slow-running tachometer can cause an engine to run past the maximum RPM limits. Since there are no post- manufacture accuracy requirements for engine tachometers, tachometer inaccuracy could lead to propeller failure, excessive vibration, or un- scheduled maintenance. If the tachometer ex- ceeds 2 percent (plus or minus) of the tested RPM, replace it. 8-96.8-106. [RESERVED.] Page 8-40 Par 8-94PDF Image | AFS-640
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