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Service Bulletin

SB 642

Lycoming Engines

Issued
2021-06-17
Models covered
1

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SB

SB 642

Lycoming Engines

Issued 2021-06-17

NOT AN FAA REQUIREMENT — This is a manufacturer document. It is not an FAA Airworthiness Directive and compliance is not required by 14 CFR 39 unless an AD cites it.

Incorrect Piston and Ring Combination

Source: Lycoming Engines, retrieved 2026-09-01

View on Lycoming Engines' site (opens in a new tab)

Applies to 1 model in our index

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