SA8453SWLanding gear and brakes
Replace the o-ring seals in the landing gear lower strut.
FAA holder: Metrea Special Aerospace ISR Inc.
Aircraft STC directory
Twin Commander Aircraft 500-S STCs
The Jun 30, 2026 FAA DRS snapshot contains 31 selected supplemental type certificates with status Current whose public applicability data names the Twin Commander Aircraft 500-S. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
31
listed Current at snapshot
19
holder directories
7
modification categories
Apr 29, 2025
latest recorded revision
Modification demand surface
Other aircraft modifications13
Engine and powerplant6
Fuel systems6
Landing gear and brakes2
Flight controls2
Aircraft connectivity1
Aircraft structures1
Recorded holders
Merlyn Products Inc.7RPM Commander LLC3S-TEC Corporation2Metrea Special Aerospace ISR Inc.1Kaman Corporation Aircraft Wheel and Brake LLC1Aviation Specialties Unlimited Inc.1Avidyne Corporation1Brittain Industries, Inc1Hartzell Engine Technologies, LLC1Aircraft Components Inc1Commuter Air Technology Inc1Straight Flight Inc1BF Goodrich Aerospace1FFC Manufacturing1Saint-Gobain Performance Plastics Corp1Aircenter Inc1Floats & Fuel Cells1DeVore Aviation Corporation of America, a New Mexico Corporation1Metzger James R1
Recently revised 500-S STCs
Showing the 31 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
View record
SA706GLLanding gear and brakes
Install Cleveland conversion kit P/N 199-122 (for aircraft using MIL-H05606 brake fluid), or199-122A (for aircraft using 'Skydrol' brake fluid).
FAA holder: Kaman Corporation Aircraft Wheel and Brake LLC
SA09763DSFlight controls
Installation of an S-TEC 01326 Digital Flight Control System (DFCS).
FAA holder: S-TEC Corporation
SA02700SEOther aircraft modifications
Installation of a Supplemental Lighting System.
FAA holder: Aviation Specialties Unlimited Inc.
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
SA1847WEOther aircraft modifications
Installation of Brittain Up-Command Signal Adapter Kit.
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
SA02450SEEngine and powerplant
Installation of the Lycoming IO-540-M1C5 engine and Hartzell HC-C3YR-2UF/FC8468()-6R propeller.
FAA holder: Merlyn Products Inc.
SA01212SEOther aircraft modifications
Manufacture of Merlyn 320 Turbo Twin Commander Conversion Kit.
FAA holder: Merlyn Products Inc.
SA01142SEEngine and powerplant
Installation of the Merlyn Products Inc. Model 290 or 300 Turbocharger system.
FAA holder: Merlyn Products Inc.
SA1445SWOther aircraft modifications
Modification of Mitchell automatic flight system AK221 installed per STC SA680SW.
FAA holder: Commuter Air Technology Inc
SA00047DEOther aircraft modifications
Installation of copilot, left front passenger, right front passenger bulb windows. (S/N 3083).
FAA holder: Straight Flight Inc
SA404CEAircraft structures
Installation of Hoskins supplemental position light system which includes Model A wing tip lights and Model D or K(dual) tail light.
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
SA02013SEEngine and powerplant
Modification of the fuel system, structures, and engine installation.
FAA holder: Merlyn Products Inc.
SA01956AT-DFuel systems
Installation of replacement fuel cell assemblies.
FAA holder: FFC Manufacturing
SA01222SEFuel systems
Modification of the existing fuel system to increase its capacity.
FAA holder: Merlyn Products Inc.
SA2478SWEngine and powerplant
Installation of Lycoming IO-720- B1B engine and increase take-off and landing weight to 7800 lbs.
FAA holder: RPM Commander LLC
SA2691WEEngine and powerplant
Installation of Lycoming IO-720-B1B or B1BD turbocharged engine.
FAA holder: RPM Commander LLC
SA529WEOther aircraft modifications
Installation of turbosupercharged Lycoming IO-540 series engines.
FAA holder: RPM Commander LLC
SA01754SEOther aircraft modifications
Installation of the Merlyn Products Inc. remote oil filter.
FAA holder: Merlyn Products Inc.
SA1-143Other aircraft modifications
Installation of Chamberlain 2001X series radome kits.
FAA holder: Saint-Gobain Performance Plastics Corp
SA01314WIFuel systems
Replace the original equipment oil temperature, oil pressure, and fuel pressure 3-in-1 gauges and dual cylinder head temperature gauge with oil temperature, oil pressure, and cylinder head temperature 3-in-1 gauges and dual fuel pressure gauge.
FAA holder: Central Airlines Inc
SA2826SWFuel systems
Installation of auxiliary fuel tank according to Report No. MDL 60700 Master Drawing List revised 7/27/78, or later FAA approved revision.
FAA holder: Aircenter Inc
SA09530AC-DOther aircraft modifications
Installation of S-TEC System 55X Two-Axis Automatic Flight Guidance System, Model ST-904.
FAA holder: S-TEC Corporation
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
SA00169SEEngine and powerplant
Install Lycoming IO-540-M1C5 engine and Hartzell HC-C3YR-2UF/FC8468()-6R propeller.
FAA holder: Merlyn Products Inc.
SA1017EAOther aircraft modifications
Installation of vertical tail floodlights.
FAA holder: DeVore Aviation Corporation of America, a New Mexico Corporation
SA00874WIFlight controls
Installation of elevator and rudder trim actuator.
FAA holder: Central Airlines Inc