Supersedes Service Letter No. L250 To all Lycoming Engine Owners, Operators, and Authorized Lycoming Distributors This Service Letter communicates to Lycoming engine owners and operators Lycoming Engines’ exchange engine core policy.

January 14, 2011 To all Owners and Operators of Lycoming O-235 Aircraft Engines This Service Letter introduces the new upgraded O-235 crankcase and associated replacement part numbers available as an option to replace the existing O-235 crankcases.

November 23, 2010 To all Lycoming Engine Owners, Operators, and Authorized Lycoming Distributors This Service Letter is a notice that recent lots of connecting rod bolts P/N 75060 have a variant marking of the part number on the bolt head as shown in Figure 1. Figure 2 shows the typical marking. The bolt with the variant marking (in Figure 1) can still be used. It will not change measurements for...

October 6, 2010 Engines Affected To all Lycoming Engine Owners, Operators, and Field Service Personnel In the wake of Teledyne Continental Motors’ (TCM’s) announcement that they will no longer produce or support dual magnetos, this Service Letter introduces Lycoming Engines’ plan to use an alternative replacement dual magneto that will be used on Lycoming engines once our current supply of TCM...

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that Special Service Publication No. SSP­567, “Camshaft Regrinding” and all subsequent revisions, all of which were withdrawn from circulation by Lycoming many years ago, are inactive and have been withdrawn by Lycoming engines.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”.