Service Bulletin No. 201 F

Inspection of Crankshaft Flange

  • Publications

March 26, 2013

MODELS AFFECTED

All Lycoming direct drive aircraft engines

TIME OF COMPLIANCE

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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