Lycoming O-540 family
Lycoming O-540 is a family of six-cylinder, horizontally opposed, air-cooled aircraft piston engines with direct drive. A carburetor supplies a central induction passage and individual pipes distribute the fuel-air mixture to the cylinders. Airframe baffles direct cooling air through the cylinder fins. Cessna R182, TR182 and earlier T182 installations use specific O-540 variants; induction and installation details must therefore be read at the model level, while the related IO-540 denotes the fuel-injected branch.
Identity
- Aliases
- O-540Lycoming O-540
- Domains
- aviation
- Identity Level
- family
- Kind
- piston-engine
- Name
- Lycoming O-540 family
- Status
- active
Details
- Description
- Lycoming O-540 is a family of six-cylinder, horizontally opposed, air-cooled aircraft piston engines with direct drive. A carburetor supplies a central induction passage and individual pipes distribute the fuel-air mixture to the cylinders. Airframe baffles direct cooling air through the cylinder fins. Cessna R182, TR182 and earlier T182 installations use specific O-540 variants; induction and installation details must therefore be read at the model level, while the related IO-540 denotes the fuel-injected branch.
- Developers
- Manufacturers
- Piston Specs
- Configuration
- horizontally opposed
- Cylinder Count
- 6
Links
Assets & Meta
- Creation Time
- July 30, 2026 at 20:43:02 UTC
- Updated Time
- October 17, 2026 at 14:05:41 UTC
Other
- Sources
- Accessed Date
- 2026-07-30
- Note
- Validates FAA Type Certificate 3A13 and maps 182 series model groups to O-470-L/R/S/U, O-540-J3C5D, O-540-L3C5D, IO-540-AB1A5, and TIO-540-AK1A installations.
- Publisher
- Civil Aviation Authority of New Zealand
- Title
- Type Acceptance Report 1/21B/15 - Cessna 182 Series
- Accessed Date
- 2026-07-30
- Note
- Provides the official O-540/IO-540 family boundary and lists the exact Cessna-relevant model designations, including O-540-J3C5D, O-540-L3C5D, and IO-540-AB1A5.
- Publisher
- Lycoming Engines
- Title
- O-540 & IO-540 Operator's Manual