SERVICE INSTRUCTION NO. 1587 DATE: February 3, 2022 SUBJECT: Reprint of AVStar Service Information Letter No. AFS-SIL-03 MODELS AFFECTED: All Lycoming engine models with an AVStar LVC-3-3A, LVC-3-3PA, LVC-5-4PA, LVC-5-5BPA, LVC-5-5PA, LHC-6-6BPA & LHC-6-6BA TIME OF COMPLIANCE: Whenever adjustments are made to an AVStar carburetor installed on a Lycoming engine

SERVICE LETTER NO. L289 Valve Spring Part Numbers DATE POSTED: March 2, 2022 TO: All Owners, Operators, and Maintenance Providers of Lycoming Aircraft Engines REASON FOR PUBLICATION: Lycoming has released new valve springs with new part numbers that are interchangeable with the old valve springs.

Supersedes Service Instruction No. 1533 D April 7, 2022 MODELS AFFECTED All Lycoming reciprocating aircraft engines using rotary-style fuel pumps TIME OF COMPLIANCE As Required for Replacement REASON FOR REVISION Added 62E28152 fuel pump to Table 1

SERVICE INSTRUCTION NO. 1583 DATE: May 18, 2022 SUBJECT: Front Expansion Plug Replacement MODELS AFFECTED: All Lycoming opposed series engines using a front expansion plug TIME OF COMPLIANCE: As necessary when front expansion plug replacement is required