Service Letter No. L283

Alternate Ignition System

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SERVICE LETTER NO. L283
Alternate Ignition System 
DATE:

February 19, 2021

TO:

All Owners and Operators of Lycoming YO-233 Series engines

REASON FOR PUBLICATION:

This Service Letter is announcing the availability of an alternate ignition system to replace the Champion Aerospace Electronic Ignition System (Lycoming P/N 66K26674-Y) on YO-233 Series engines. Installing this alternate ignition system will maintain the engine's compliance with ASTM F2339.

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