Service Letter No. 270

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

Publications
DATE RELEASED:

April 5, 2017

TO:

All Owners and Operators of Lycoming Direct Drive Engines

REASON FOR SERVICE LETTER:

This Service Letter identifies extended maintenance intervals as benefits of routine exclusive use of
approved unleaded fuels identified in the latest revision of Service Instruction No. SI-1070 for Lycoming
engine models. 

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