DATE RELEASEED: November 2012 TITLE: IO-540-AG1A5 Series Engine Installation and Operation Manual DOCUMENT PART NUMBER: 60297-45 MODELS AFFECTED: IO-540-AG1A5 Series

Service Bulletin No. 648C Wastegate Solenoid Valve Inspection and Cleaning February 20, 2025 MODELS AFFECTED TEO-540-C1A TIME OF COMPLIANCE During each scheduled oil change REASON FOR REVISION Added new NOTICE and steps 6 and 7 to the procedure for Helicoil® inspection. Added sentence that S.B provides ICA.

Service Bulletin No. 659 STD-33 Plain Washer Replacement February 20, 2025 MODELS AFFECTED All Lycoming Reciprocating Aircraft Engines TIME OF COMPLIANCE At overhaul or at the next maintenance event which requires removal of STD-33 plain washers, whichever occurs first.

Service Bulletin No. 661 STD-35 Plain Washer Replacement February 20, 2025 MODELS AFFECTED All Lycoming Reciprocating Aircraft Engines TIME OF COMPLIANCE At overhaul or at the next maintenance event which requires removal of STD-35 plain washers, whichever occurs first.

Service Letter No. L162B (Supersedes Service Letter No. L162A) DATE RELEASED: January 29, 1982 TO: All Owners, Operators and Service Facilities

REPLACEMENT OF 6-CYLINDER ELECTRONIC IGNITION SYSTEM (EIS) DATE: April 2, 2025 MODELS AFFECTED: All 6-cylinder EIS used in a helicopter application operating in any category TIME OF COMPLIANCE: For Engines with the Original EIS: Before further flight for engines with more than 100 hours, Time-In-Service on the EIS. For Engines with more than 50 hours, but less than 100 hours, Time-In-Service on...