APPROVED SPARK PLUGS DATE: April 9, 2020 SUBJECT: Approved Spark Plugs MODELS AFFECTED: All Lycoming piston aircraft engines TIME OF COMPLIANCE: As required for replacement REASON FOR REVISION: Added new engine model IO-390-D to Tables 4 and 5.

SERVICE TABLE OF LIMITS AND TORQUE VALUE RECOMMENDATIONS DATE RELEASED: April 13, 2020 TITLE: Service Table of Limits and Torque Value Recommendations DOCUMENT PART NUMBER: SSP-1776-5

FAA-APPROVED STARTERS AND ALTERNATORS DATE: April 16, 2020 SUBJECT: FAA-Approved Starters and Alternators MODELS AFFECTED: Lycoming engines as herein specified TIME OF COMPLIANCE: As required for replacement REASON FOR REVISION: Added NOTICE on page 1 regarding installation of components. Added Hartzell Engine Technologies (HET) part numbers to Table 2. Revised Table 1 to include IO-390-D Series...

DATE RELEASED: April 22, 2020 TITLE: IO-390-D Series Engine Illustrated Parts Catalog DOCUMENT PART NUMBER: PC-IO-390-D MODELS AFFECTED: IO-390-D Series

SI-1060U – PUSH ROD IDENTIFICATION DATE: April 22, 2020 SUBJECT: Push Rod Identification MODELS AFFECTED: All Lycoming aircraft engines. TIME OF COMPLIANCE: Anytime push rod replacement is necessary. REASON FOR REVISION: Added IO-390-D to Tables 2 and 4. Revised CAUTION and NOTICE on page 1.

SERVICE INSTRUCTION NO. 1009 BE Time Between Overhaul (TBO) Schedules DATE: April 24, 2020 SUBJECT: Time Between Overhaul (TBO) Schedules MODELS AFFECTED: Lycoming Engine Models Defined Herein REASON FOR REVISION: Added a new paragraph at the end of the Operating Hour Time Period TBO section. Added new engine model IO-390-D to Table 1. Revised Table 2 to include separate listings for engine model...

Supersedes Service Instruction No. 1014M DATE: July 29, 2020 MODELS AFFECTED All Lycoming opposed series aircraft engines. TIME OF COMPLIANCE When preservation oil is removed or when lubricating oil is changed or added. REASON FOR UPDATE Updated lubrication oils and temperature ranges.

SUBJECT: Repair of Oil Cooler By-Pass Valve Seat DATE: April 26, 1986 MODELS AFFECTED: PART I: All Avco Lycoming piston engines equipped with a P/N 75944 oil cooler bypass valve. PART II: All Avco Lycoming direct drive engines that incorporate either a dual magneto drive accessory housing or a P/N 69510 oil pressure screen and temperature valve housing on an individual magneto drive accessory...

Service Instruction No. 1577 Intake Valve In-Service Data DATE: November 10, 2020 SUBJECT: Intake Valve In-Service Data MODELS AFFECTED: O-540-F1B5 engines with serial number ending with “-40E” installed in Robinson R44 Raven I and R44 Cadet helicopters TIME OF COMPLIANCE: During the next scheduled 50-hour inspection for engines with less than 500 hours since new, rebuild, overhaul, or cylinder...