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LYCOMING ENGINES
652 Oliver Street
Williamsport, PA 17701
1-800-258-3279

KNOWLEDGE BASE

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Service Bulletins | 04.02.25
Service Bulletin No. 656A

Replacement of 6-Cylinder Electronic Ignition System (EIS)

Service Letters | 03.10.25
Service Letter No. L 162 B

Heli-Coil Service Repair Kit

Service Bulletins | 02.21.25
Service Bulletin No. 661

STD-35 Plain Washer Replacement

Service Bulletins | 02.21.25
Service Bulletin No. 659

STD-33 Plain Washer Replacement

Service Bulletins | 02.21.25
Service Bulletin No. 648 C

Wastegate Solenoid Valve Inspection and Cleaning

Installation & Operator Manuals | 02.21.25
IO-540-AG1A5 Series Engine Installation and Operation Manual

Lycoming Part Number: 60297-45

Installation & Operator Manuals | 02.21.25
YO-233-B2A Series Engine Installation and Operation Manual

Lycoming Part Number: 60297-40-B

Installation & Operator Manuals | 02.21.25
IO-540-AF1A5 Operation and Installation Manual

Lycoming Part Number: 60297-33

Maintenance Manuals | 02.21.25
TIO-540 Series Parallel Valve Cylinder Heads Operator’s Manual

Lycoming Part Number: 60297-23P

Installation & Operator Manuals | 02.21.25
O-320 76 Series Operator’s Manual

Lycoming Part Number: 60297-22

Installation & Operator Manuals | 02.21.25
O-540, IO-540 Series Operator’s Manual

Lycoming Part Number: 60297-10

Installation & Operator Manuals | 02.21.25
O-235 and O-290 Series Operator’s Manual

Lycoming Part Number: 60297-9

Installation & Operator Manuals | 02.11.25
TIO-540 Series Angle Valve Cylinder Heads Operator's Manual

Document Part No. 60297-23A

Reference Documents | 01.09.25
Service Bulletin No. 658

Starter Inspection, Hartzell Engine Tech (HET) Service Bulletin (SB) No.211

Service Bulletins | 01.06.25
ENGINE MOUNTED OIL FILTER KITS AND RELACEMENT FILTERS SSP-885-2

Special Service Publication SSP-885-2

Parts Catalog | 01.06.25
TEO-540-C1A Illustrated Parts Catalog Rev 6

DOCUMENT PART NO. PC-TEO-540-C1A REV 6

Service Bulletins | 11.05.24
FAA Airworthiness Directive AD 2024-21-02

Lycoming Engine's Response to AD 2024-21-02

Service Instructions | 10.03.24
Service Instruction No. 1592

Set up and Adjustment of Fuel Control. Installation of the Throttle Position Sensor (TPS) and Mixture Position Sensor (MPS)

Reference Documents | 09.20.24
Service Bulletin No. 660

Reprint of Slick/Champion Aerospace Service Bulletin SB1-24A

Tips | 07.18.24
Learn More About Lycoming’s Efforts Around Unleaded Fuels

Lycoming remains committed to finding a comprehensive fuel solution that will allow a fleet-wide transition to lead-free aviation fuels for piston-engine aircraft

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Lycoming Engines is an Operating Division of Avco Corporation. ©2025 Avco Corporation.

LYCOMING ENGINES
652 Oliver Street
Williamsport, PA 17701
1-800-258-3279