Service Letter No. 220 C

Wide Deck Cylinder Configuration on Lycoming Engines


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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