Aircraft STC directory
Textron Lycoming AVCO O-540-A1D5 STCs
The Jun 30, 2026 FAA DRS snapshot contains 6 selected supplemental type certificates with status Current whose public applicability data names the Textron Lycoming AVCO O-540-A1D5. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
6
listed Current at snapshot
5
holder directories
2
modification categories
Aug 31, 2023
latest recorded revision
Modification demand surface
Recently revised O-540-A1D5 STCs
Showing the 6 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
Replace counterweights on Lycoming O-540-A1A5, -A1B5, -A1C5, -A1D5, and IO-540-C1B5 engines.
FAA holder: Whelen Aerospace Technologies
Installation of a Shadin Company fuel flow transducer.
FAA holder: Shadin Avionics
Installation of AiResearch Turbosupercharger 406330.
FAA holder: GE Engine Services-Corporate Aviation Inc. DBA Garrett Aviation Services