SL 270

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Lycoming Engines

Issued 2017-04-07

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.

Extended Maintenance Intervals for Spark-Ignited Engines Operated on Unleaded Fuels

Source: Lycoming Engines, retrieved 2026-09-01

View on Lycoming Engines' site

Applies to 6 models in our index

Lycoming IO-390 Lycoming Engines · engine
Lycoming IO-580 Lycoming Engines · engine
Lycoming IO-720 Lycoming Engines · engine
Lycoming O-320 Lycoming Engines · engine
Lycoming O-360 Lycoming Engines · engine
Lycoming O-540 Lycoming Engines · engine