Service Letter No. 220 C

Wide Deck Cylinder Configuration on Lycoming Engines

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Supersedes Service Letter No. L220B

To All Lycoming Engine Owners, Operators, and Authorized Lycoming Distributors


All Lycoming engines made since July 1, 1987 except O-235 engines

This Service Letter is an informational document about wide deck cylinders on Lycoming aircraft engines. Except for O-235 series engines, Lycoming Engines has made all new engines with a “wide deck cylinder” configuration instead of the narrow deck cylinder configuration since July 1, 1987.

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