SERVICE LETTER NO. L285
Change in cylinder configuration for O-235-C, -E, and -H Series engines
August 25, 2021
All Owners and Operators of Lycoming O-235-C, -E, and -H Series engines
REASON FOR PUBLICATION:
Lycoming supplied cylinders for O-235-C, -E, and -H Series engines were previously plain steel, straight-bore cylinders. This design has been replaced with nitrided, choke-bore cylinders.
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