Supersedes Service Letter No. L261 To All Owners and Operators of Helicopteres Guimbal Cabri G2 with the following carburetors: Lycoming part number (P/N) 61B26215 (AVStar P/N AV10-6110) Lycoming P/N 61B26215-L (AVStar P/N AV10-6110) Lycoming P/N 61B28159 (AVStar P/N AV10-6500) REASON FOR REVISION Added alternate carburetor part number In support of a request from Helicopteres Guimbal, there is an...

March 11, 2015 To All Owners and Operators of Lycoming IO-540-AC1A5 and TIO-540-AJ1A Engine Models This Service Letter is in response to reports of discolored paint on engine cylinders of IO-540-AC1A5 and TIO-540-AJ1A engine models. Discoloration on an engine cylinder can be the result of the unique engine configuration and the ecologically friendly paint applied to the cylinder at the factory and...

December 31, 2014 Models Affected All Owners and Operators of Lycoming Aircraft Engines Table 1 of this Service Letter identifies new piston ring part numbers (P/N) that replace existing piston ring part numbers. All of the new piston rings are equivalent to the existing piston rings. Existing and new piston rings can be mixed in the same engine, but be sure to use either all new piston rings in a...

January 23, 2014 To all owners and operators of Lycoming engine model O-360-A4M installed in Piper Archer III with AVStar carburetor model AV10-6102. This Service Letter is notification of the following two product improvements by AVStar to carburetor model AV10-6102 (Lycoming P/N 61C26051). These product improvements have been incorporated into new O-360-A4M engines with Serial Numbers L-42322...

August 27, 2013 To all Lycoming Engine Owners, Operators, and Authorized Lycoming Distributors This Service Letter is to advise customers, operators and authorized Lycoming distributors that External Retaining Ring P/N MS16624­37 is superseded by P/N MS16624­2037 External Retaining Ring (zinc coated).

April 15, 2013 To all Owners and Operators of Lycoming Piston Aircraft Engines Lycoming Engines’ naming convention for carburetor model designations is identified in the following table. The naming convention is intended to prescribe the general feature set specification of the carburetor and does not constitute the complete specification of the product.

DATE: November 16, 2007 SUBJECT Clearance Between Oil Sump Assembly and Oil Sump Baffle. MODELS AFFECTED New, rebuilt, overhauled, or repaired Lycoming IO­540­L1C5; TIO­540­ S1AD; IO­580­B1A series engines. TIME OF COMPLIANCE Whenever rivets or screws are found in the oil suction screen. Lycoming has determined that on the above affected engines there may not be enough clearance between the oil...

Supersedes Service Letter No. L220B To All Lycoming Engine Owners, Operators, and Authorized Lycoming Distributors MODELS AFFECTED All Lycoming engines made since July 1, 1987 except O-235 engines This Service Letter is an informational document about wide deck cylinders on Lycoming aircraft engines. Except for O-235 series engines, Lycoming Engines has made all new engines with a “wide deck...