Supersedes Service Letter No. L240 May 27, 2009 To all Owners and Operators of Lycoming Aircraft Engines The purpose of this Service Letter is to inform owners and operators of Lycoming aircraft engines what is indicated by the -70 or -85 suffix on the end of a Lycoming part number.

November 2, 2007 To all Owners and Operators of Lycoming Aircraft Engines The purpose of this Service Letter is to notify all owners of Lycoming aircraft engines that Special Service Publication No. SSP­567, “Camshaft Regrinding” and all subsequent revisions, all of which were withdrawn from circulation by Lycoming many years ago, are inactive and have been withdrawn by Lycoming engines.

Supersedes Service Letter No. L234A DATE RELEASED: June 15, 2007 MODELS AFFECTED: To all Owners and Operators of Lycoming Reciprocating Aircraft Engines Lycoming Engines is pleased to announce a special tool rental program. This program is designed to support your need for special tools required for maintaining Lycoming reciprocating engines. Please check Lycoming Special Tool Catalog SSP-384 for...

Supersedes Service Letter No. L221B and Supplement No. 1 to Service Letter No. L221B Models Affected To all Owners and Operators of Lycoming Piston Aircraft Engines Lycoming requires that any Precision Airmotive Corporation fuel control product that needs repair, within the warranty period, be sent directly to an Authorized Precision Airmotive Corporation Product Support Center for verification...

March 27, 2006 Models Affected To all Owners and Operators of Lycoming Aircraft Engines On February 21, 2006, Lycoming issued Service Bulletin No. 569, “Crankshaft Retirement for Certain Lycoming Engines”.

Supersedes Service Letter No. L173B March 10, 2006 Models Affected To Owners and Operators of Slick Aircraft Products Magneto equipped Lycoming Aircraft Engines This reprint is current at the time Service Letter No. L173C is issued. However, when complying with this Service Letter, insure that this reprint of Slick Aircraft Products Service Bulletin No. SB2-80C is still current at the time of...

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...

Supersedes Service Letter No. L180 A Models Affected To all Owners and Operators of Textron Lycoming Aircraft Engines Engines in aircraft that are flown only occasionally may not achieve normal service life because of corrosion. This occurs when moisture from the air and products of combustion combine to attack cylinder walls and bearing surfaces during periods when the aircraft is not used. The...

Supersedes Service Letter No. L197 January 19, 1988 Models Affected To all Owners and Operators of Textron Lycoming Piston Aircraft Engines In order to minimize valve sticking problems, procedures recommended in this Service Letter should be followed. Depending on the degree of intensity, sticking between the valve stem and guide can severely restrict the valve's opening and closing movements. A...