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

KNOWLEDGE BASE

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Installation & Operator Manuals | 02.29.20
IO-390-D Engine Installation and Operation Manual

PART NO. IOM-IO-390-D SERIES

Service Bulletins | 01.17.20
Service Bulletin No. 639

Inspection of Rocker Arm, Part Number LW-15014

Service Letters | 12.17.19
Service Letter No. 277

Hartzell Engine Technologies and Lycoming Engines Alternator Distribution Agreement

Service Letters | 10.10.19
Service Letter No. 279

Lycoming model designation for fuel injectors

Service Letters | 07.13.19
Service Letter No. 278

Lycoming Engines' Product Support Hours

Service Instructions | 05.15.19
Service Instruction No. 1279 D

Oil Sump Baffle Replacement

Service Instructions | 03.22.19
Service Instruction No. 1415 A

New Turbocharger Mounting Hardware

Service Bulletins | 03.14.19
Service Bulletin No. 637

Reprint of Slick/Champion Aerospace Service Bulletin SB1-19

Service Bulletins | 03.14.19
Service Bulletin No. 622 A

Reprint of Slick/Champion Aerospace Service Bulletin SB1-15

Service Instructions | 01.08.19
Service Instruction No. 1011 N

Tappets and Lifters

Service Instructions | 01.08.19
Service Instruction No. 1498 B

Recommended Engine Procedures for Purge of Vapor During Ground Operations

Service Bulletins | 10.10.18
Service Bulletin No. 634

Cylinder and Head Assembly Serviceable Life

Installation & Operator Manuals | 09.30.18
TEO-540-A1A Engine Installation & Operations Manual

DOCUMENT PART NO. IOM-TEO-540-A1A

Maintenance Manuals | 09.30.18
TEO-540-A1A Engine Maintenance Manual

Document Part No. MM-TEO-540-A1A

Service Instructions | 08.24.18
Service Instruction No. 1571

Lockplate installation for Induction Housing on TIO-540-AJ1A and IO-540-AC1A5

Service Letters | 08.24.18
Service Letter No. 247 J

Shelf Life Requirements

Service Bulletins | 08.24.18
Service Bulletin No. 301 B

Maintenance Procedures and Service Limitations for Valves

Service Instructions | 08.02.18
Service Instruction No. 1570 A

Alternate Oil Sump Fitting Configuration for Aerobatic Inverted Oil System

Service Instructions | 08.02.18
Service Instruction No. 1572

Plug Replacement of Vapor Return Fitting on Piper installation of IO-360- B4A

Service Letters | 05.16.18
Service Letter No. 275 A

Warranty Procedure for Exhaust System Replacement Referenced in the most current revision of SB627

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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