Service Instruction No. 1042 AH

APPROVED SPARK PLUGS

Publications
APPROVED SPARK PLUGS
DATE:

April 9, 2020

SUBJECT:

Approved Spark Plugs

MODELS AFFECTED:

All Lycoming piston aircraft engines

TIME OF COMPLIANCE:

As required for replacement

REASON FOR REVISION:

Added new engine model IO-390-D to Tables 4 and 5.

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