SHELF LIFE REQUIREMENTS DATE: August 23, 2018 TO: All Owners and Operators of Lycoming Engines Aircraft Engines SUBJECT: Shelf Life Requirements REASON FOR REVISION: Added part numbers 37B19774-472, LW-12008, and STD-1934 to Table 1; Removed part number 951392 from Table 2; added part number AV951392 to Table 2

Lockplate installation for Induction Housing on TIO-540-AJ1A and IO-540-AC1A5 DATE: August 23, 2018 SUBJECT: Lockplate installation for Induction Housing on TIO-540-AJ1A and IO-540-AC1A5 MODELS AFFECTED: TIO-540-AJ1A, IO-540-AC1A5 TIME OF COMPLIANCE: Required at next Overhaul, or at owner’s discretion.

DATE RELEASED: November 2011 TITLE: O-320-E1A & -E2A Parts Catalog DOCUMENT PART NUMBER: PC-203-3 MODELS AFFECTED: O-320-E1A, O-320-E2A

Cylinder and Head Assembly Serviceable Life DATE: October 11, 2018 SUBJECT: Cylinder and Head Assembly Serviceable Life MODELS AFFECTED: All Lycoming Engines with Parallel Valve Cylinder and Head Assemblies (Table 1) shipped from Lycoming Engines between 1-SEP-2013 and 30-APR-2015 (excludes O-235 series) TIME OF COMPLIANCE: During Cylinder and Head Assembly removal for condition or overhaul

Recommended Engine Procedures for Purge of Vapor During Ground Operations DATE: January 7, 2019 SUBJECT: Recommended Engine Procedures for Purge of Vapor During Ground Operations MODELS AFFECTED: Lycoming engines equipped with fuel injection. TIME OF COMPLIANCE: As necessary during aircraft operations when symptoms of fuel vaporization are encountered. REASON FOR REVISION: Removed model specific...

Tappets and Lifters DATE: January 7, 2019 SUBJECT: Tappets and Lifters MODELS AFFECTED: All Lycoming engines TIME OF COMPLIANCE: At overhaul or at owner’s discretion REASON FOR REVISION: Added new engine model, TEO-540 Series to Table 3.

Document Part No. MM-TEO-540-A1A DATE RELEASED: October 2018 TITLE: TEO-540-A1A Maintenance Manual DOCUMENT PART NUMBER: MM-TEO-540-A1A

DOCUMENT PART NO. IOM-TEO-540-A1A DATE RELEASED: October 2018 TITLE: TEO-540-A1A Installation & Operations Manual DOCUMENT PART NUMBER: IOM-TEO-540-A1A

Service Bulletin No. 622A Reprint of Slick/Champion Aerospace Service Bulletin SB1-15A March 13, 2019 MODELS AFFECTED All Lycoming engines in Table 1 equipped with Slick 4200, 4300, or 4700 Series (LASAR) magnetos. TIME OF COMPLIANCE Next maintenance event, not to exceed 50 hours. This Service Bulletin is notification of required action for mandatory compliance with Slick/Champion Aerospace...