Service Bulletin No. 201 F
Inspection of Crankshaft Flange
March 26, 2013
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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