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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