Service Letter No. 242

January 6, 2005

Models Affected

To all Owners and Operators of Lycoming IO-360-L2A, IO-540-AB1A5, IO-540- AC1A5, TIO-540-AJ1A and TIO-540-AK1A Engines Installed in Cessna Aircraft.

As a product improvement an improved lower idle valve has been introduced into the fuel injectors used on IO-360-L2A, IO-540-AB1A5, IO-540-AC1A5, TIO-540-AJ1A and TIO-540-AK1A engines installed in Cessna Aircraft. This new valve is more tolerant of contaminants that may be in the fuel. (See the attached Precision Letter.)

Improved Lower Idle Valve in Fuel Injectors
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https://www.lycoming.com/sites/default/files/Improved%20Lower%20Idle%20Value%20in%20Fuel%20Injectors.pdf