# STCs that may be installed: N504DD A list on [N504DD](https://openairdocs.org/aircraft/N504DD.md). Approved for this aircraft’s airframe or engine model. The registry doesn’t record which STCs an aircraft has; its records do. In force first, then newest. Page 1 of 2 · 86 STCs - [STC SA04484CH](https://openairdocs.org/stc/SA04484CH.md): Installation of a Reabe Aircraft Improvement Power Gate Control System · Reabe Design LLC - [STC SA04837NY](https://openairdocs.org/stc/SA04837NY.md): Installation of AeroLED's Holdings, LLC., position lights, navigation lights, strobe lights and beacon lights · AeroLED's Holdings, LLC - [STC SA02019SE-D](https://openairdocs.org/stc/SA02019SE-D.md): Installation of Garmin Model GTN 625/635/650; 725/750 Navigation System · Garmin International Inc. - [STC SA12204WI](https://openairdocs.org/stc/SA12204WI.md): Wing Spar Cap manufacturing process change · Air Tractor Inc. - [STC SA03040CH](https://openairdocs.org/stc/SA03040CH.md): Installation of a digital payload hopper quantity and spray boom pressure indicating system · Reabe Design LLC - [STC SA04046CH PAGE 1](https://openairdocs.org/stc/SA04046CH%20PAGE%201.md): Installation of L-3 GENESIS (TM) Electronic Standby Instrument System (ESI-500/MAG-500) · Acron Aviation Inc. - [STC SA04676CH](https://openairdocs.org/stc/SA04676CH.md): Installation of a True Quantity Gauge System · Reabe Design LLC - [STC SA02266SE](https://openairdocs.org/stc/SA02266SE.md): Installation of a Lever Throttle Quadrant · Kawak Aviation Technologies Inc - [STC SA02444AK](https://openairdocs.org/stc/SA02444AK.md): Approval of the L-3 Communications NGT 9000/9000R ADS-B system installed · ADS-B Technologies LLC - [STC SA01714WI](https://openairdocs.org/stc/SA01714WI.md): Installation of a Garmin transponders: (a) GTX 330/330D/33/33D with ADS-B Out functionality; (b) GTX 335/335R/345/345R with ADS-B Out and In functionality; or (c) GTX 335R/345R with ADS-B Out functionality in select airplanes installed with G950/G1000 systems. · Garmin International Inc - [STC SA02135SE](https://openairdocs.org/stc/SA02135SE.md): Installation of Electronics International Inc. Glass Panel Engine Monitor (with In-Flight Data) · Electronics International Inc. - [STC SA04165NY](https://openairdocs.org/stc/SA04165NY.md): Installation of Latitude Technologies Skynode S200 Satcom system must be performed · Latitude Technologies Corporation - [STC SA01323CH](https://openairdocs.org/stc/SA01323CH.md): Installation of a ground single point fueling system. · Turbine Conversions Ltd - [STC SA04145NY](https://openairdocs.org/stc/SA04145NY.md): Installation of the Flight Data Acquisition Storage and Transmission System (Fast) · Amtech Aeronautical Limited - [STC SA01745WI](https://openairdocs.org/stc/SA01745WI.md): Installation of a Cable Cutter System on the Main Landing Gear · Hershey Flying Service Inc - [STC SA01845WI](https://openairdocs.org/stc/SA01845WI.md): Installation of a Center Windshield · Hershey Flying Services - [STC SA09873AC](https://openairdocs.org/stc/SA09873AC.md): Installation of Night Vision Goggle (NVG) compatible lighting system in Air Tractor, Inc. · REB Technologies Inc - [STC SA00382BO](https://openairdocs.org/stc/SA00382BO.md): Installation of Globalstar Antenna and Cradle provisions to support a Globalstar GPS-1700 in non-composite airplanes · Avidyne Corporation - [STC SA02276AK](https://openairdocs.org/stc/SA02276AK.md): Installation of AMSAFE Aviation Inflatable Restraints · AMSAFE Inc. - [STC SA02119SE PAGE 1](https://openairdocs.org/stc/SA02119SE%20PAGE%201.md): Installation of Garmin GDL 88 ADS-B UAT Transceiver System · Garmin International Inc - [STC SA03439CH](https://openairdocs.org/stc/SA03439CH.md): Installation of a Hartzell Propeller model.HC-B4TN-3C/T10702NS (4 Blade) · Aero Innovations LLC - [STC SA02442AK PAGE 1](https://openairdocs.org/stc/SA02442AK%20PAGE%201.md): Approval of the L-3 Communications NGT 2000/2500 ADS-B system · ADS-B Technologies, LLC - [STC ST03554CH](https://openairdocs.org/stc/ST03554CH.md): Installation of Rotary Gatekeeper and provisions equipment · Turbine Conversions Ltd - [STC SA00403SE](https://openairdocs.org/stc/SA00403SE.md): Installation of Vortex Generators on the wings · Micro AeroDynamics Inc - [STC SA02985CH](https://openairdocs.org/stc/SA02985CH.md): Installation of a Cool Start System in accordance with Installation Instructions, Revision A, dated April 14, 2011, or later FAA Approved revision. · Turbine Conversions Ltd - [STC SA00068SE](https://openairdocs.org/stc/SA00068SE.md): Installation of fuel flow/pressure instruments. (W/TSIO-360-MB1) · Electronics International Inc. - [STC SA02110CH](https://openairdocs.org/stc/SA02110CH.md): Installation of a Time Trac Data Recorder · P2 Incorporated - [STC SA2693NM](https://openairdocs.org/stc/SA2693NM.md): Installation of Electronics International digital volt/amp gauges and accessories. · Electronics International Inc. - [STC SA04677CH](https://openairdocs.org/stc/SA04677CH.md): Installation of a Powered Hopper Lid and Auger System · Reabe Design LLC - [STC SE12225AC](https://openairdocs.org/stc/SE12225AC.md): This STC will incorporate P&W 1700 rpm propeller reduction gearbox on P&WC engines to allow 1700 rpm propeller installation · High Cotton Aircraft Conversions, LLC · Lists PT6A-41 - [STC SE00010EN](https://openairdocs.org/stc/SE00010EN.md): Instructions for Continued Airworthiness for the PT6A-25, and, -25A engine models that define specific maintenance tasks and their associated maintenance schedules, and that are used as a supplement to the applicable Pratt & Whitney Canada manuals. · MORE Company Inc · Lists PT6A-25 - [STC SE000010EN](https://openairdocs.org/stc/SE000010EN.md): Instructions for Continued Airworthiness for the PT6A-25 and PT6A-25A engine models that define specific maintenance tasks and their associated maintenance schedules, and that are used as a supplement to the applicable Pratt & Whitney Canada manuals. · MORE Company, Inc. · Lists PT6A-25 - [STC SE000011EN](https://openairdocs.org/stc/SE000011EN.md): Instructions for Continued Airworthiness for the PT6A-25C engine models that define specific maintenance tasks and their associated maintenance schedules, and that are used as a supplement to the applicable Pratt & Whitney Canada manuals. · MORE Company, Inc. · Lists PT6A-25C - [STC SE00001EN](https://openairdocs.org/stc/SE00001EN.md): Engines will be maintained IAW 'Maintenance or Reliable Engines(MORE) Program,' Rev 2, 8/16/95. · MORE Company Inc · Lists PT6A-38 - [STC SE00002EN](https://openairdocs.org/stc/SE00002EN.md): Instructions for Continued Airworthiness for the PT6A-34, -34AG, -34B, -36, -114, -114A, -116, -135, and -135A engine models that define specific maintenance tasks and their associated maintenance schedules, and that are used as a supplement to the applicable Pratt & Whitney Canada manuals. · MORE Company Inc · Lists PT6A-114 - [STC SE00003EN](https://openairdocs.org/stc/SE00003EN.md): Instructions for Continued Airworthiness for the PT6A-6/C20, -20, -20A and, -20B engine models that define specific maintenance tasks and their associated maintenance schedules, and that are used as a supplement to the applicable Pratt & Whitney Canada manuals. · MORE Company Inc · Lists PT6A-20 - [STC SE00004EN](https://openairdocs.org/stc/SE00004EN.md): Instructions for Continued Airworthiness for the PT6A-11, -11AG, -15AG, -110 and-112 engine models that define specific maintenance tasks and their associated maintenance schedules, and that are used as a supplement to the applicable Pratt & Whitney Canada manuals. · MORE Company Inc · Lists PT6A-11 - [STC SE00006EN](https://openairdocs.org/stc/SE00006EN.md): Instructions for Continued Airworthiness for the PT6A-45A, -45B, and, -45R engine models that define specific maintenance tasks and their associated maintenance schedules, and that are used as a supplement to the applicable Pratt & Whitney Canada manuals. · MORE Company Inc · Lists PT6A-45A - [STC SE00011EN](https://openairdocs.org/stc/SE00011EN.md): Instructions for Continued Airworthiness for the PT6A-25C engine model that define specific maintenance tasks and their associated maintenance schedules, and that are used as a supplement to the applicable Pratt & Whitney Canada manuals. · MORE Company Inc · Lists PT6A-25C - [STC SE000EN](https://openairdocs.org/stc/SE000EN.md): Engines will be maintained IAW 'Maintenance or Reliable Engines(MORE) Program,' Rev 4, dated 8/16/95. · MORE Company Inc · Lists PT6A-21 - [STC SE10947SC](https://openairdocs.org/stc/SE10947SC.md): The conversion of the Pratt & Whitney Canada, Model PT6A-21 to a PT6A-28 turboprop engine · Prime Turbines · Lists PT6A-21 - [STC SE00482SE](https://openairdocs.org/stc/SE00482SE.md): Incorporation of turbine engine into a twin power section turboprop assembly. · Fifty-Ten-Yankee LLC · Lists PT6A-114A - [STC SE10552SC](https://openairdocs.org/stc/SE10552SC.md): Conversion of Pratt & Whitney Canada Corp. Model PT6A-27 or -28 to a Model PT6A-34 turboprop engine. · Prime Turbines LLC · Lists PT6A-27 - [STC SE11139SC](https://openairdocs.org/stc/SE11139SC.md): The conversion of the Pratt & Whitney Canada, Model PT6A-135 to a PT6A-135A turboprop engine · Airforce Turbine Service · Lists PT6A-135 - [STC SE11141SC](https://openairdocs.org/stc/SE11141SC.md): The conversion of the Pratt & Whitney Canada, Model PT6A-15AG to a PT6A-34AG turboprop engine · RT Turbines Inc · Lists PT6A-15AG - [STC SE02170AT](https://openairdocs.org/stc/SE02170AT.md): Installation of Pc Safety Valve Kit · Bell Helicopter Textron Inc. · Lists PT6A-27 - [STC SE11095SC](https://openairdocs.org/stc/SE11095SC.md): The conversion of the Pratt & Whitney Canada, Model PT6A-27 to a PT6A-34 turboprop engine · R.T. Turbines, Inc. · Lists PT6A-27 - [STC SE01624WI](https://openairdocs.org/stc/SE01624WI.md): Conversion of Pratt & Whitney Canada, Model PT6A-60A to a North Star Aviation PT6A-60AG turboprop engine. Data required: 1. A copy of this certificate 2. North Star Aviation document, NSA No. 1200, Turboprop Engine Conversion of PT6A-60A Model to PT6A-60AG Configuration per FAA Approved STC, dated March 15, 2011, or later FAA approved revision 3. The ICA supplement for North Star Aviation PT6A-60AG models, Instructions for Continued Airworthiness, NSA No. 1200-ICA, Rev NC, dated March 9, 2011 or later applicable revision. · North Star Aviation Inc. · Lists PT6A-60A - [STC SE02837NY](https://openairdocs.org/stc/SE02837NY.md): The conversion of the Pratt & Whitney Canada PT6A-21 engine to operate as a PT6A-28 engine to be done. · Rocky Mountain Aircraft · Lists PT6A-21 - [STC SE02688NY](https://openairdocs.org/stc/SE02688NY.md): This modification would incorporate improved compressor components into the Pratt & Whitney PT6A-28 engine from the PT6A-135A engine. · Standard Aero Limited · Lists PT6A-28 Next page: https://openairdocs.org/aircraft/N504DD/stcs.md?page=2 ## The whole list in SQL Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS: ```sql SELECT m.matched_by, s.stc_number, s.description, s.holder, s.status, s.status_date, m.matched_model FROM ( SELECT stc_number, min(side) AS side, arg_min(matched_by, side) AS matched_by, arg_min(matched_model, side) AS matched_model FROM (SELECT stc_number, 1 AS side, 'airframe' AS matched_by, matched_model FROM 'https://openairdocs.org/data/latest/faa_aircraft_model_stc.parquet' WHERE aircraft_model_code = '0390310' UNION ALL SELECT stc_number, 2, 'engine', matched_model FROM 'https://openairdocs.org/data/latest/faa_engine_model_stc.parquet' WHERE engine_model_code = '52032') GROUP BY stc_number ) m JOIN 'https://openairdocs.org/data/latest/faa_stc.parquet' s USING (stc_number) ORDER BY m.side, s.status = 'Current' DESC, s.status_date DESC, s.stc_number ``` This list as a web page: https://openairdocs.org/aircraft/N504DD/stcs --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.