Service Instruction No. 1042 AF

Approved Spark Plugs

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APPROVED SPARK PLUGS
DATE:
April 9, 2018 

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, HIO-390-A Series to Tables 4 and 5; corrected thread length measurements in Figures 1 and 2

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