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

KNOWLEDGE BASE

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Service Instructions | 04.08.20
Service Instruction No. 1012 L

COUNTERWEIGHTS AND ROLLERS ON ENGINE MODELS

Service Instructions | 04.08.20
Service Instruction No. 1098 Q

PROPELLER FLANGE BUSHING LOCATION

Service Bulletins | 04.08.20
Service Bulletin No. 369 S

ENGINE INSPECTION AFTER OVERSPEED

Service Instructions | 04.07.20
Service Instruction No. 1070 AB

SPECIFIED FUELS FOR SPARK-IGNITED GASOLINE AIRCRAFT ENGINE MODELS

Service Instructions | 03.12.20
Service Instruction No. 1575

New Connecting Rod Bushing

Maintenance Manuals | 02.29.20
IO-390-D Series Engine Maintenance Manual (Principal Manual) (Rev 1)

PART NO. MM-IO-390-D SERIES

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

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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