SA1904WEEngine and powerplant
Installation of Vibration Isolation Products (VIP) engine mount P/N VIP-50804-10 on various aircraft as shown on FAA Approved Model List (AML) No. SA1904WE.
FAA holder: FTG, Inc.
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.
15
listed Current at snapshot
12
holder directories
8
modification categories
Jan 3, 2023
latest recorded revision
Modification demand surface
Other aircraft modifications4
Fuel systems4
Electrical systems2
Engine and powerplant1
Aircraft connectivity1
Flight controls1
Aircraft structures1
Landing gear and brakes1
Recorded holders
Signature Flight Support Corporation3FTG, Inc.1Avidyne Corporation1Brittain Industries, Inc1Hartzell Engine Technologies, LLC1Aircraft Components Inc1Twin Commander Aircraft LLC1BF Goodrich Aerospace1FFC Manufacturing1SMR Technologies Inc1Floats & Fuel Cells1DeVore Aviation Corporation of America, a New Mexico Corporation1
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.
View record
SA00382BO (PAGE 2)Aircraft connectivity
Installation of Globalstar Antenna and Cradle provisions to support a Globalstar GPS-1700 in non-composite airplanes.
FAA holder: Avidyne Corporation
SA4-1414Flight controls
Installed Brittain Industries, Inc., B2D Flight Control System.
FAA holder: Brittain Industries, Inc
SA01660CHOther aircraft modifications
Remove Janitrol P/N C15C54 or Twin Commander P/N 88035-5 combustion heater and install C&D Associates, Inc. Model CD35K heater kit 10 P/N CD12043K10.
FAA holder: Hartzell Engine Technologies, LLC
SA02547AT (PG 3)Other aircraft modifications
Installation of a Voice Alert System.
FAA holder: Aircraft Components Inc
SA260SWElectrical systems
Installation of a Protective Device in the ground side of the Battery and External Power relays.
FAA holder: Twin Commander Aircraft LLC
SA90CEAircraft structures
Installation of Hoskins Supple- mental Model A or B, high intensity wing tip lights, Model C tail light, with or without Models 1 or 2 high intensity fuselage lights.
FAA holder: BF Goodrich Aerospace
SA00794CHFuel systems
Replace Twin Commander fuel cap assembly with Shaw Aero Devices Fuel Cap (P/N 416-50) and adapter (P/N 416-938).
FAA holder: Commander Aero Inc
SA01956AT-DFuel systems
Installation of replacement fuel cell assemblies.
FAA holder: FFC Manufacturing
SA02005NYOther aircraft modifications
Installation of SMR Technologies pneumatic deicer models.
FAA holder: SMR Technologies Inc
SA8597SWFuel systems
Installation of P/N DF062-507, upper center fuel tank bladder cells as a replacement for original bladder P/N 5630062-507.
FAA holder: Floats & Fuel Cells
SA2-318Landing gear and brakes
Installation of Goodyear brake 9530303 and related equipment.
FAA holder: Signature Flight Support Corporation
SA2-67Fuel systems
Install Eclipse Pioneer fuel flow indicating system.
FAA holder: Signature Flight Support Corporation
SA2-75Electrical systems
Revised and installed new electrical components.
FAA holder: Signature Flight Support Corporation
SA1017EAOther aircraft modifications
Installation of vertical tail floodlights.
FAA holder: DeVore Aviation Corporation of America, a New Mexico Corporation