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April 17, 1995 The W9OHASP series propellers are designed for assembly in a splined hub, AC41G2325-6 or
equivalent. Assembly of the propeller to the hub and installation of the propeller assembly must be
accomplished by personnel holding the appropriate authority.
A) If the propeller and hub are already assembled when delivered, proceed to the instructions furnished by the hub supplier for mounting the assembly on the engine crankshaft (Item III). B) If the propeller and hub must be assembled the following procedure is recommended: 1) position the propeller on a bench with the blades horizontal. Insert the hub into the hub bore from the rear so that the double width spline is at 90 or 270 degrees (90 degrees to the axis of the blades), and assemble the front face plate. Insert the attaching bolts through the rear hub face, propeller, and front face plate (so that the nuts will be on the front face plate), using a soft head hammer to tap them in place. Tighten the nuts lightly and evenly (the threads must be clean and free from oil). 2) Place the assembly on a propeller stand and tighten the attaching bolts in small increments (moving diagonally across the bolt circle) to 250 inch-lb. wrench torque. It is permissible to increase wrench torque to 300 inch-lb. to allow insertion of cotter keys. If a conventional propeller stand is not available, the assembly may be temporarily mounted on the engine crankshaft while the propeller attaching bolts are tightened (it is recommended that a spark plug be removed from each cylinder to facilitate checking of blade track, and to prevent possible engine firing as it is turned). 3) The propeller blade tips should track within 1/16 inch of each other when propeller hub assembly is completed. This can be checked by rotating the blade tips past a fixed reference point. Slight adjustment of bolt torque on opposite sides of the hub is usually sufficient to correct blade track. 4) The propeller attaching bolts must be safety wired after proper pre-load (250 to 300 inch-lb. wrench torque) and proper track (within 1/16 inch at blade tips) are obtained. A) Propellers are carefully balanced when manufactured. After assembly with a hub, a final balance check is recommended so that changes which may have occurred during storage can be corrected. To check balance, a rigid knife edge balance, with an arbor which seats in the hub cone-seats, or a suspension type balance can be used - IN A ROOM FREE FROM AIR CURRENTS. When properly balanced, there should be no persistent tendency for the assembly to rotate from any position on a knife edge balance, or to tilt on a suspension balance. B) Sheet metal balance weights, installed under bolt pairs on the light side, may be used to correct either horizontal or vertical balance. A) INSTALLATION: 1) The rear cone, propeller hub, front cone, hub retaining nut, and snap ring should be assembled on the engine shaft in that order. Parts should be lightly coated with grease before assembly. 2) The hub retaining nut should be tightened to 450 ft-lb. wrench torque. This may be applied by a man of approximately 175 lb., using a 31 inch rod. If 450 ft-lb. will not allow the lock pin holes to align, a maximum of 500 ft-lb. is permissible to achieve alignment. 3) The snap ring should be inserted over the retaining nut and the nut secured by the clevis pin and cotter. B) REMOVAL: To remove the propeller hub from the engine shaft, the clevis pin securing the hub retaining nut must first be removed. The hub nut may then be unscrewed, drawing the hub nut off the shaft. The front cone and nut may be removed from the hub by removing the snap ring. CAUTION Be sure that, when the propeller hub nut is fully torqued, it has not run out of threads but that the hub is firmly seated on the cones. This can be ascertained by turning the bare nut down on the crankshaft and counting the turns to bottom (usually 9 to 10). Count turns of the nut during propeller/hub installation. When the retaining nut is fully torqued at least one turn, but not more than 3, must remain on the crankshaft threads. Installation, and removal, of a propeller/hub must be accomplished by personnel holding the appropriate FAA license. NOTE: These instructions were supplied to SENSENICH WOOD PROPELLER CO. to accompany propeller/hub assembly instructions as applicable to KINNER R-55 & R-56 engines. Recommendations may differ for installation on other engines. The following practices will add service-life to your wood propeller: 1) Do not use the propeller as a tow-bar when moving your aircraft on the ground. 2) Avoid engine run-up in areas containing loose stones and gravel. 3) Place the propeller in a horizontal position when parked. 4) Inspect the blades and metal tipping frequently for bruises, scars or other damage. 5) If your propeller is subjected to any kind of impact, do not operate it until it has been thoroughly inspected by qualified personnel. 6) Protect your propeller from moisture by waxing with an automotive type paste wax. Check the drain holes in the metal tipping to be sure they are open. 7) Inspect and check bolts for tightness at least every 100 flight-hours or annually. More frequent checks may be necessary when climatic changes are extreme. 8) Have all wood and metal tipping repairs accomplished by the factory or by an approved propeller repair facility. 9) Check balance of the complete hub/propeller assembly whenever there is evidence of roughness in operation. 10) If your propeller begins to show any of the following marks, it should be retired from service: a) Crack(s) in the hub bore. b) A deep cut across the wood grain. c) A long, wide, or deep crack parallel to the grain. d) A separated lamination. e) Oversize or elongated hub bore or bolt holes. f) An appreciable warp (discovered through inspection or through rough operation). g) An appreciable portion of missing wood. h) Obvious damage beyond economical repair. These instructions are generally applicable for installation of wood aircraft propellers in AC41G2325-6 splined hubs.
2008 Wood Court - Plant City, FL 33563 Phone: (813) 752-3711 - Fax: (813) 752-2818 |
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