Service Bulletin No. 646A

T-Bolt Clamp Inspection

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Service Bulletin No. 646A T-Bolt Clamp Inspection

April 22, 2022

MODELS AFFECTED

Lycoming Engines models TEO-540-C1A; TIO-540-R2AD, -W2A; (L)TIO-540-F2BD, -J2B, -J2BD

TIME OF COMPLIANCE

Inspection of non-conforming T-bolt clamp every 50 hours or replacement with conforming T-bolt clamp at owner’s discretion. Replacement with conforming T-bolt clamp must not exceed 12 months.

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