Installation of oil fitting(AN-823-5D) in rocker box cover.
FAA holder: Airwolf Filter Corporation
Aircraft STC directory
The Jun 30, 2026 FAA DRS snapshot contains 7 selected supplemental type certificates with status Current whose public applicability data names the Continental Motors IO-520-J. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
Showing the 7 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
FAA holder: Airwolf Filter Corporation
FAA holder: Western Skyways Aircraft Modifications Inc.
FAA holder: B & B Aviation LLC
FAA holder: B & B Aviation LLC
FAA holder: DERS Group Svc LLC
FAA holder: Air Comm Corporation
FAA holder: General Aviation Modifications, Inc.