SE01954SE (PAGE 3)Engine and powerplant
Installation of engine crankcase seal.
FAA holder: Ly-Con Rebuilding Company
Aircraft STC directory
Lycoming Engines IO-540-D4B5 STCs
The Jun 30, 2026 FAA DRS snapshot contains 4 selected supplemental type certificates with status Current whose public applicability data names the Lycoming Engines IO-540-D4B5. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
4
listed Current at snapshot
4
holder directories
2
modification categories
Nov 14, 2024
latest recorded revision
Modification demand surface
Engine and powerplant3
Aircraft performance1
Recently revised IO-540-D4B5 STCs
Showing the 4 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
View record
SE01436LAEngine and powerplant
Installation of Firewall Forward Technologies LLC modified camshaft.
FAA holder: Centri-lube Technologies LLC
SE03498ATAircraft performance
Conversion of Lycoming IO-540-D4B5 to Alamo Aerospace Model IO-540-D4B5-AA that has the same performance ratings and limitations as Lycoming Model IO-540-D4B5.
FAA holder: Air Plains Services Corporation
SE7734SWEngine and powerplant
Modification of engine for operation with ethanol fuel.
FAA holder: Shauck Dr Maxwell E Jr.