# STCs that may be installed: N20AT A list on [N20AT](https://openairdocs.org/aircraft/N20AT.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 5 · 208 STCs - [STC SA800EA](https://openairdocs.org/stc/SA800EA.md): Installation of Whelen Anti-Collision, Position, or Anti-Collision/Position Light System, and applicable associated power supplies · Whelen Aerospace Technologies - [STC SR01050LA](https://openairdocs.org/stc/SR01050LA.md): Installation of main rotor blades P/N 500P2300-501/503/505 · Helicopter Technology Company - [STC SR01059LA](https://openairdocs.org/stc/SR01059LA.md): Installation of right side dual utility mount · Airfilm Camera Systems LLC - [STC SH133WE](https://openairdocs.org/stc/SH133WE.md): Installation of C-75 cargo rack set. · Isolair Inc. - [STC SH3686NM](https://openairdocs.org/stc/SH3686NM.md): Installation of an Isolair Model3700-110 spray tank system. (500N restricted category) · Isolair Inc. - [STC SR01106DE](https://openairdocs.org/stc/SR01106DE.md): Installation of Crash Resistant Auxiliary Fuel Tank i · Aerospace Composites Solutions Inc. - [STC SR00181IB](https://openairdocs.org/stc/SR00181IB.md): Installation of alternate Cabin Door Latches to replace OEM door locks · Aerologic LLC - [STC SR00709AT](https://openairdocs.org/stc/SR00709AT.md): Installation of Starter-Generator Cooling Kit · Precision Heli-Support LLC · Lists 369 Series - [STC SR00771LA](https://openairdocs.org/stc/SR00771LA.md): Installation of right-side utility mount. · Airfilm Camera Systems LLC - [STC SR00772LA](https://openairdocs.org/stc/SR00772LA.md): Installation of left-side utility mount. · Airfilm Camera Systems LLC - [STC SR00862LA](https://openairdocs.org/stc/SR00862LA.md): Installation of aft belly utility mount. · Airfilm Camera Systems LLC - [STC SR04637CH](https://openairdocs.org/stc/SR04637CH.md): Replacement of existing main ship battery with Lithium Ion Battery and installation of Annunciator Control Panel · Airwolf Aerospace LLC - [STC SR00068DE](https://openairdocs.org/stc/SR00068DE.md): Installation of infrared imaging system. · Dart Aerospace Company - [STC SH5247NM](https://openairdocs.org/stc/SH5247NM.md): Installation of external pod, camera mount, and 12 volt power provision. · Dart Aerospace USA Inc. - [STC SR00146IB](https://openairdocs.org/stc/SR00146IB.md): nstallation of the Integrated Health and Usage Monitoring System (HUMS) · RMCI Canada Inc. - [STC SR02120SE](https://openairdocs.org/stc/SR02120SE.md): Installation of Garmin GTN 6XX/7XX Navigation System · Garmin International Inc. - [STC SH2735NM](https://openairdocs.org/stc/SH2735NM.md): Installation of pneumatic door actuators. · Dart Aerospace USA Inc. - [STC SR02808LA](https://openairdocs.org/stc/SR02808LA.md): Installation of MD500 Side Pull Kit · Aerocraft Incorporated - [STC SH5206NM](https://openairdocs.org/stc/SH5206NM.md): Installation of two underfuselage jacking hard points. · Dart Aerospace USA Inc. - [STC SR00376DE](https://openairdocs.org/stc/SR00376DE.md): Installation of laser mapping system. · Dart Aerospace USA Inc. - [STC SR04160CH](https://openairdocs.org/stc/SR04160CH.md): Installation of Heli-Preheat Kit, p/n TA3089-1 for 115 volt application · HARTZELL PROPELLER INC - [STC SR00043LA](https://openairdocs.org/stc/SR00043LA.md): Installation of clip on Main Rotor Swashplate · Pac West Helicopters Inc. - [STC SH3319NM](https://openairdocs.org/stc/SH3319NM.md): Installation of Precise Flight Pulselite Control Unit in the Landing /Taxi Recognition Visual Control Light system, · Precise Flight Inc - [STC SR01778SE](https://openairdocs.org/stc/SR01778SE.md): Installation of Onboard Systems International Cargo Hook Kits and Load Weigh Kit · Onboard Systems International LLC - [STC SH2262NM](https://openairdocs.org/stc/SH2262NM.md): Installation of a fore-and-aft medical evacuation litter(s) kit. · MD Helicopters LLC - [STC SR00902DE](https://openairdocs.org/stc/SR00902DE.md): Installation of External Equipment Mounts for provisions · MD Helicopters Inc - [STC SR00923DE](https://openairdocs.org/stc/SR00923DE.md): Installation of Genesys AeroSystems Avionics Display Upgrade · MD Helicopters Inc - [STC SR04680NY](https://openairdocs.org/stc/SR04680NY.md): Installation of Human External Cargo (HEC) Long-Line Kit · Boost Human External Cargo Systems Inc. - [STC SR00314AT](https://openairdocs.org/stc/SR00314AT.md): Installation of engine firewall in Hughes 369 model helicopter · Thoroughbred Aviation Maintenance Inc - [STC SR00450AT](https://openairdocs.org/stc/SR00450AT.md): Installation of a seat pan inspection panel. · Thoroughbred Aviation Maintenance Inc · Lists 369 Series - [STC SR00829AT](https://openairdocs.org/stc/SR00829AT.md): Installation of front extended cabin step. · Thoroughbred Aviation Maintenance Inc · Lists 369 Series - [STC SR01839AT](https://openairdocs.org/stc/SR01839AT.md): Installation of cyclic friction levers · Thoroughbred Aviation Maintenance Inc. - [STC SR02859AT](https://openairdocs.org/stc/SR02859AT.md): Installation of Part Number 369HT21004 main rotor hub fairing as a direct replacement for OEM Part Number 369D21004-11 (BSC) · Thoroughbred Aviation Maintenance Inc - [STC SR04175AT](https://openairdocs.org/stc/SR04175AT.md): Installation of the HT400 Inspection Panel Kit · Thoroughbred Aviation Maintenance Inc - [STC SR02693LA](https://openairdocs.org/stc/SR02693LA.md): Installation of a redundant system for the primary Cargo Hook system when conducting Human External Cargo (HEC) external loads operations · Onboard Systems International LLC - [STC SH4908NM](https://openairdocs.org/stc/SH4908NM.md): Fabrication of Onboard Systems Model 200-034-00, 200-034-01, and 200-034-02 Load Weigh Kits · Onboard Systems International - [STC SR00407SE](https://openairdocs.org/stc/SR00407SE.md): Fabrication of Onboard Systems Model 200-187-00 cargo hook kit · Onboard Systems International LLC - [STC SR00525SE](https://openairdocs.org/stc/SR00525SE.md): Fabrication of Onboard Systems Model 200-231-00 and 200-231-01 Cargo Hook Attach Point Kit and installation of these Cargo Hook Attach Point Kits · Onboard Systems International - [STC SR00892SE](https://openairdocs.org/stc/SR00892SE.md): Fabrication of Onboard Systems International Model 200-264-00, 200-264-01, and 200-264-02 Cargo Hook Kits. · Onboard Systems International - [STC SR02001SE](https://openairdocs.org/stc/SR02001SE.md): Fabrication and installation of Model 72448 locking fuel cover assembly · Timberline Aerospace LLC - [STC SR02713SE](https://openairdocs.org/stc/SR02713SE.md): Manufacture and Installation of Human External Cargo (HEC) Hook System · Mechanical Specialties Inc - [STC SR02704SE](https://openairdocs.org/stc/SR02704SE.md): Installation and maintenance of the Sunspot 36 and 46 series lights · AeroLED's Holdings LLC - [STC SR01343NY](https://openairdocs.org/stc/SR01343NY.md): Installation of main rotor blade tie down tips. · VIH Aerospace Inc - [STC SR04539NY](https://openairdocs.org/stc/SR04539NY.md): Installation of the Human External Cargo (HEC) System · Boost Human External Cargo Systems Inc. - [STC SR02622SE](https://openairdocs.org/stc/SR02622SE.md): Installation of Garmin G500H TXi Display System (Primary Flight Display (PDF), Multi-Function Display (MFD)) · Garmin International Inc - [STC SR02712LA](https://openairdocs.org/stc/SR02712LA.md): Installation of Torque Indicating Systems · Precision Heli-Support LLC - [STC SR02124SE](https://openairdocs.org/stc/SR02124SE.md): Installation functionality. of Data Garmin Required: transponders: (1) Garmin GTX Master 345/345R Drawing with List ADS-B (MDL), Out and In 005-00734-A4, functionality; · Garmin International Inc - [STC SH656GL](https://openairdocs.org/stc/SH656GL.md): Installation of auxiliary fuel system. · Fargo Manufacturing Co. - [STC SH908GL](https://openairdocs.org/stc/SH908GL.md): Installation of air conditioning system. · Fargo Manufacturing Co. - [STC SH994GL](https://openairdocs.org/stc/SH994GL.md): Installation of belly-mounted, cargo carrier. · Fargo Manufacturing Co. Next page: https://openairdocs.org/aircraft/N20AT/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 = '3027371' UNION ALL SELECT stc_number, 2, 'engine', matched_model FROM 'https://openairdocs.org/data/latest/faa_engine_model_stc.parquet' WHERE engine_model_code = '54023') 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/N20AT/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.