Propeller Strike Incidents
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A propeller strike is: (1) any incident, whether or not the engine is operating, that requires repair to the propeller other than minor dressing of the blades as set forth in Part I, B of this Service Bulletin or (2) any incident while the engine is operating in which the propeller makes contact with any object that results in a loss of engine RPM.

Propeller strikes against the ground or any object, can cause engine and component damage even though the propeller may continue to rotate. This damage can result in catastrophic engine failure.

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Propeller Strike Inspections
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Following any propeller strike, complete disassembly and inspection of all rotating engine components is mandatory and must be accomplished prior to further flight. Inspect all engine driven accessories in accordance with the manufacturer’s maintenance instructions. Prior to any ground operation of the engine assure that the propeller flange and the crankshaft flange area are free of any crack indications. In addition to the engine component inspection requirements set forth in the appropriate overhaul manual, the following inspection procedures must be accomplished:

  • Crankshaft

    The crankshaft must be inspected by magnetic particle inspection. All crankshaft surfaces must be cleaned free of sludge, paint or any other substance that could mask reliable magnetic particle inspection indications.

  • Connecting Rods

    Connecting rods, gears, and all other steel internal engine parts must be magnetic particle inspected.

  • Crankcase

    The crankcase must be stripped, and fluorescent penetrant inspection performed, paying particular attention to the forward crankcase bearing support and adjacent structure.

  • Rod Bolts

    Connecting rod bolts and nuts must be replaced regardless of condition.

  • Counterweight

    On counterweight equipped engines, replacement of all counterweight pins, bushings, end plates and snap rings is required regardless of their condition. Counterweight bushing bores in both counterweights and crankshaft must be inspected in accordance with the criteria contained in the latest revision of SB00-3.

  • Engine

    Inspect all engine-driven accessories in accordance with the accessory manufacturer’s instructions.

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