Service Letter No. 270
Extended Maintenance Intervals for Spark-Ignited Engines Operated on Unleaded Fuels
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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