Aircraft STC directory
Twin Commander Aircraft 520 STCs
The Jun 30, 2026 FAA DRS snapshot contains 15 selected supplemental type certificates with status Current whose public applicability data names the Twin Commander Aircraft 520. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
Modification demand surface
Recorded holders
Recently revised 520 STCs
Showing the 15 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
Installed Brittain Industries, Inc., B2D Flight Control System.
FAA holder: Brittain Industries, Inc
Installation of a Voice Alert System.
FAA holder: Aircraft Components Inc
Installation of a Protective Device in the ground side of the Battery and External Power relays.
FAA holder: Twin Commander Aircraft LLC
Installation of replacement fuel cell assemblies.
FAA holder: FFC Manufacturing
Installation of SMR Technologies pneumatic deicer models.
FAA holder: SMR Technologies Inc
Installation of Goodyear brake 9530303 and related equipment.
FAA holder: Signature Flight Support Corporation
Install Eclipse Pioneer fuel flow indicating system.
FAA holder: Signature Flight Support Corporation
Revised and installed new electrical components.
FAA holder: Signature Flight Support Corporation
Installation of vertical tail floodlights.
FAA holder: DeVore Aviation Corporation of America, a New Mexico Corporation