SPECIFIED FUELS FOR SPARK-IGNITED GASOLINE AIRCRAFT ENGINE MODELS DATE: April 8, 2020 SUBJECT: Specified Fuels for Spark-Ignited Gasoline Aircraft Engine Models MODELS AFFECTED: Lycoming engine models as detailed in Table 3 TIME OF COMPLIANCE: When refueling aircraft REASON FOR REVISION: Added listings for IO-390-D to Table 3

ENGINE INSPECTION AFTER OVERSPEED DATE: April 9, 2020 SUBJECT: Engine Inspection after Overspeed MODELS AFFECTED: All Lycoming piston engines. TIME OF COMPLIANCE: As required by the subject bulletin. REASON FOR REVISION: Added new engine model IO-390-D to Table 1. Added new steps in Table 4 to include EIS Overspeed. Added a new NOTICE before the Magneto Overspeed Inspection section. Added a new...

DATE RELEASED: June 2024 TITLE: IO-390-D Series Maintenance Manual (Principal Manual) (Rev 1) DOCUMENT PART NUMBER: Part No. MM-IO-390-D Series MM-IO-390-D Series IO-390-D Series Maintenance Manual – Revision 1 Update changes requested since original release. Changes made in following chapters: Airworthiness Limitations Sections 05-00 12-30 72-30 74-30

DATE RELEASED: March 2020 TITLE: IO-390-D Engine Installation and Operation Manual DOCUMENT PART NUMBER: Part No. IOM-IO-390-D Series

SUBJECT Propeller Flange Bushing Locations DATE April 9, 2020 MODELS AFFECTED All Certified Lycoming direct drive engines TIME OF COMPLIANCE At owner's discretion REASON FOR REVISION Added IO-390-D1A6, -D1B6, -D3A6, -D3B6 engine models to Table 1

COUNTERWEIGHTS AND ROLLERS ON ENGINE MODELS DATE: April 9, 2020 SUBJECT: Counterweights and Rollers on Engine Models MODELS AFFECTED: All Lycoming engines with counterweights TIME OF COMPLIANCE: As required REASON FOR REVISION: Added new engine models, IO-390-D Series to Table 5.

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...