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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