Squawk Box

September 1999 Issue

More Lycoming Woes

Crankshaft problems may plague some new and recently overhauled engines

The following information is derived from the FAA’s Service Difficulty Reports and Aviation Maintenance Alerts. Click here to view "Airworthiness Directives."


Textron Lycoming engines have come under scrutiny again, this time for crankshaft counterweight pilot holes that were out of round, resulting in the possible failure of the crankshaft counterweight bushings or counterweight ears.

The FAA has issued a Special Airworthiness Information Bulletin to help operators identify abnormal crankshafts and prevent premature engine failure.

Lycoming manufactured an unknown number of nonconforming crankshafts, and five have failed in t...

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