Aircraft STC directory
Boeing DC3C-S4C4G STCs
The Jun 30, 2026 FAA DRS snapshot contains 91 selected supplemental type certificates with status Current whose public applicability data names the Boeing DC3C-S4C4G. 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 DC3C-S4C4G STCs
Showing the 91 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
Installation of a Garmin GTS 8000 Traffic Alert and Collision Avoidance System (TCAS) II.
FAA holder: Preferred Improvements LLC
Installation of Underside Roller Doors.
FAA holder: Basler Turbo Conversions LLC
Installation of an EO/IR System.
FAA holder: Basler Turbo Conversions LLC
Installation of a wingtip modification on DC3C aircraft (specific models listed).
FAA holder: Preferred Improvements LLC
Installation of Airwolf Filter Corp. Air Oil Separator.
FAA holder: Airwolf Filter Corporation
Installation of P&W Canada PT6A-65AR or PT6A-67R engines.
FAA holder: Greenwich Aircraft Corporation
Installation of long range fuel system.
FAA holder: Greenwich Aircraft Corporation
Installation of a bleed air activated vacuum system.
FAA holder: Greenwich Aircraft Corporation
Removal of lead ballast from front and aft faces of original firewalls.
FAA holder: Greenwich Aircraft Corporation
Installation of a Saint-Gobain Performance Plastics Belly Radome in accordance with StandardAero Master Data List 1036433, Revision (B), dated September 25, 2019 or later FAA approved revision.
FAA holder: Standard Aero Business Aviation Services LLC
Installation of Gustin Aviation chip detector light system.
FAA holder: A & L Aircraft Parts Inc
Installation of 145-gallon fuel tanks. Installation of 252-gallon fuel tanks.
FAA holder: Preferred Improvements LLC
Modification to upgrade a BendixKing CAS 67A TCAS II system to CAS 67B TCAS II Change 7.1.
FAA holder: Pro Star Aviation, LLC
Structural modifications necessary for the increase in maximum gross takeoff weight from 26,900 lbs to 29,000 lbs for STC SA3820SW - converted Douglas DC3C aircraft (specific models listed).
FAA holder: Braddick USA LLC
Installation of a Garmin Traffic Collision Avoidance System (TCAS) II with ADS-B Out Capability.
FAA holder: Basler Turbo Conversions
Installation of Provisions for a Light Detection and Ranging (LIDAR) System.
FAA holder: Basler Turbo Conversions LLC
Install placarding to restrict total payload to a maximum of six thousand pounds (6,000 lbs).
FAA holder: Preferred Improvements LLC
Installation and Activation of a Saab Grintek Defense Impi II Asset Tracking System.
FAA holder: Preferred Improvements LLC
Installation of an Ultra-Wide band (UWB) Fuselage Antenna Array.
FAA holder: StandardAero Business Aviation Services, LLC
A.P.U. Installation - Ranger Andover Model V-32D-2-1.
FAA holder: Preferred Improvements LLC
Installation of RCA Model AVQ-10 radar antenna swingaway mount SK10136 (SA3-65).
FAA holder: Preferred Improvements LLC
Installation of standard C-47 cargo door.
FAA holder: Preferred Improvements LLC
Installation of wheel well enclosure doors.
FAA holder: Preferred Improvements LLC
Installation of bird resistant windshield.
FAA holder: Preferred Improvements LLC
Picture window installation and standard window modification.
FAA holder: Preferred Improvements LLC
Installation of electrically driven emergency hydraulic pump.
FAA holder: Preferred Improvements LLC
Alternate Tee-Bolt radome attachment for STC SA3-52 radome installation.
FAA holder: Preferred Improvements LLC
Installation of a Gear Latch & Ground Shift system.
FAA holder: Preferred Improvements LLC
Installation of a Fairchild F800 or F1000 digital flight data recorder.
FAA holder: Preferred Improvements LLC
Installation of SkyTrac ISAT Airborne Position/Data Communicator.
FAA holder: SkyTrac Systems Ltd
Installation of tail wheel cover and fairing.
FAA holder: Preferred Improvements LLC
Installation of a Traffic Collision Avoidance (TCAS II) System.
FAA holder: Basler Turbo Conversions LLC
Installation of a Digital Flight Data Recorder (DFDR) System.
FAA holder: Basler Turbo Conversions LLC
Main landing gear doors, actuating system, main landing gear assist bungee, oil cooler fairing and oil cooler fixed section for aircraft with Pratt & Whitney R-1830-75, -92 or -94 engines.
FAA holder: Preferred Improvements LLC
Installation of Ice Protection Systems.
FAA holder: Preferred Improvements LLC
lnstallation of Pratt & Whitney of Canada PT6A-67R engines, Hartzell HC-B5MA-3/Ml 1276 or HC-B5MA-3( )/Ml 1691N, K model propellers, modified fuel system, revised electrical system, and forward fuselage extension.
FAA holder: Basler Turbo Conversions Inc.
Installation of a Flap and Landing Gear Aural Warning System.
FAA holder: United Aeronautical Corporation
Installation of Superflite 102 fabric.
FAA holder: Aviation Products Systems Inc.
Installation of Curtis-Wright C-46 pilot and copilot seats.
FAA holder: Sabreliner Aviation LLC
Installation of dual Stewart-Warner Model 940-B24 cabin heaters.
FAA holder: Sabreliner Aviation LLC
Installation of Stewart-Warner Model 940-B24 cabin heater.
FAA holder: Sabreliner Aviation LLC
Installation of vacuum pump and vacuum system.
FAA holder: Sabreliner Aviation LLC
Standard installation - swivel chair assembly.
FAA holder: Sabreliner Aviation LLC
Installation of short exhaust stack (simplified version).
FAA holder: Sabreliner Aviation LLC
Standard seat track installation for SK10187 swivel seat.
FAA holder: Sabreliner Aviation LLC
Installation of Generator over-heat temperature indicator system.
FAA holder: Sabreliner Aviation LLC
Installation of airstep door safety chair and release mechanism.
FAA holder: Sabreliner Aviation LLC
Nacelle modification and installation of short exhaust stacks.
FAA holder: Sabreliner Aviation LLC
Engine Fire Control Zones, Fire Detector Installation, Dual Fire Bottle Installation, Oil Cooler Installation, and Propeller Feathering System.
FAA holder: Sabreliner Aviation LLC
Typical installation of Burns Aero seat.
FAA holder: Sabreliner Aviation LLC
Installation of AiResearch oil cooler.
FAA holder: Sabreliner Aviation LLC
Installation of Cockpit side windows.
FAA holder: Sabreliner Aviation LLC
Installation of Janitrol heater.
FAA holder: Sabreliner Aviation LLC
Three-place divan assembly and installation.
FAA holder: Sabreliner Aviation LLC
Installation of a windshield carburetor propeller alcohol system.
FAA holder: Sabreliner Aviation LLC
Installation of cabin heater, Stewart-Warner 940-B24.
FAA holder: Sabreliner Aviation LLC
Bendix RDR-1 radar antenna ANT-1C installation.
FAA holder: Sabreliner Aviation LLC
Alternate landing light installation (Westinghouse 600W seal beam).
FAA holder: Sabreliner Aviation LLC
Installation Of Oilamatic Preoiler system.
FAA holder: Oilamatic Inc
Installation of carburetor adapter.
FAA holder: Signature Flight Support Corporation
Manufacture of alcohol under wing to fuselage fillet tanks, P/N 352581, to replace Douglas alcohol tanks P/N 5161344 or 5188619, and mounting bracket P/N 352573 replacing the Douglas brackets P/N 5161873-46, -48, -52, -54 and Douglas P/N 4161884 and 4161882.
FAA holder: Signature Flight Support Corporation
Install aft baggage compartment support structure.
FAA holder: Signature Flight Support Corporation
The exhaust tail pipe installed.
FAA holder: Signature Flight Support Corporation
The fuselage structure altered to incorporate a window between Station 492 and 506.
FAA holder: Signature Flight Support Corporation
Fuselage structure modified R & L side to incorporte enlarged windows and relocation of the cabin emergency exit.
FAA holder: Signature Flight Support Corporation
Altered the fuselage structure to incorporate enlarged windows.
FAA holder: Signature Flight Support Corporation
The original mechanical carburetor heat valve control, R & L engine, replaced with an electric actuator for controlling the R & L engine carburetor heat valve movement.
FAA holder: Signature Flight Support Corporation
Original hydraulic reservoir and support structure removed.
FAA holder: Signature Flight Support Corporation
A 200 amp generator system installation.
FAA holder: Signature Flight Support Corporation
Installation of R&L cockpit window.
FAA holder: Signature Flight Support Corporation
The landing light mounting in each outer wing panel leading edge altered.
FAA holder: Signature Flight Support Corporation
Installation of Surface Combustion Heater, P/N A97A28 and related equipment.
FAA holder: Signature Flight Support Corporation
Structural modification to nacelle aft of firewall to eliminate the exhaust trough cut out.
FAA holder: Signature Flight Support Corporation
Installation of 200 amp generator system with over voltage control.
FAA holder: Signature Flight Support Corporation
Installed additional structure to support Warren McArthur seat Model 192.
FAA holder: Signature Flight Support Corporation
Installation of camera hole cut out in lower fuselage structure.
FAA holder: Signature Flight Support Corporation
Installation of 300 amp generator system.
FAA holder: Signature Flight Support Corporation
Installation of Bendix Avia. Corp. (Eclipse-Pioneer) fuel flow system, transmitter 9100-5, indicator 6300 (100-1000 lbs. per hour).
FAA holder: Signature Flight Support Corporation
Installation of chairs and floor structure.
FAA holder: Signature Flight Support Corporation
Installation of fuel flow system.
FAA holder: Signature Flight Support Corporation
Installed a positive stop in the rudder system.
FAA holder: Signature Flight Support Corporation