Service Bulletin No. 201 F

Inspection of Crankshaft Flange

  • Publications

March 26, 2013


All Lycoming direct drive aircraft engines


Before continued operation of an engine that had sudden stoppage

This Service Bulletin applies to instructions for a bent crankshaft flange. Lycoming Engines no longer allows bent crankshaft flanges to be ground or repaired to restore maximum run-out. As per Service Bulletin 533B, if the crankshaft is bent, it must be replaced.

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