N421GS
STCs that may be installed · 290
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.
Query with SQL
duckdb -csv -c "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 = '2076016'
UNION ALL SELECT stc_number, 2, 'engine', matched_model FROM 'https://openairdocs.org/data/latest/faa_engine_model_stc.parquet' WHERE engine_model_code = '17039')
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"Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.
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 = '2076016'
UNION ALL SELECT stc_number, 2, 'engine', matched_model FROM 'https://openairdocs.org/data/latest/faa_engine_model_stc.parquet' WHERE engine_model_code = '17039')
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_numberRun it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.
Airframe · Cessna 421C
STC SA01800SEFabrication and installation of new or replacement of existing instrument panel lights dimmer control.STC SA01861SEFabrication and installation of Landing Light ControllerSTC SA01844WIInstallation of Garmin GFC 600 Automatic Flight Control SystemSTC SA02279ATInstallation of a Boom Beam bulb, starter, and ballastSTC SA04837NYInstallation of AeroLED's Holdings, LLC., position lights, navigation lights, strobe lights and beacon lightsSTC SA02019SE-DInstallation of Garmin Model GTN 625/635/650; 725/750 Navigation SystemSTC SA00079NYInstallation of Airwolf remote mounted engine oil filter kit AFC-K008 on single and multi engine fixed wing light aircraft incorporating Teledyne Continental reciprocating engines of 450 horsepower or less.STC SA02511SEInstallation of replacement fuel quantity indicator sending unit(s)STC SA5581SWInstallation of ALCOR true-flow/ totalizer systemSTC SA02731SEInstallation of Luma Technologies LT-4300 Series LED Display Panel and/or LT-4302 LED Gear Status AnnunciatorSTC SA02738CHInstallation of L-3 Communications Avionics SystemsSTC SA04046CH PAGE 1Installation of L-3 GENESIS (TM) Electronic Standby Instrument System (ESI-500/MAG-500)STC SA02386AKReplacement of existing landing and/or taxi light reflector and bulbs with Light Emitting Diode (LED) lighting systemsSTC SA02658SEInstallation of Garmin GI 275 Multi-Function Display SystemSTC SA02571SEInstallation of Garmin G500/G600 TXi Integrated Avionics System (Primary Flight Display, Multi-Function Display, and Engine Indicating System Display).STC SA02532ATInstallation of subject Michelin tires on appropriate aircraft. For Michelin 5, 6, 8, and 10-inch rim diameter tires on General Aviation Aircraft.STC SA00756DEInstallation of Automatic Dependent Surveillance Broadcast (ADS-B) Out Equipment using a Trig Avionics TT22 Transponder and an approved Global Positioning System (GPS) Position SensorSTC SA02010WIInstallation of the Mid-Continent Instruments & Avionics MD23 FLEX Custom Function Display (CFD)STC SA197GLInstall Cleveland conversion kit P/N 199-76.STC SA01967WIUse of GAMI G100UL High Octane Unleaded AvgasSTC SA02203AKInstallation of FlightLogic Synthetic Vision Electronic Flight Information System (EFIS-SV).STC SA02254AKInstallation of "Single Screen", "2 or 3 Screen", "Dual Screen", or "4 or 6 screen"STC SA02444AKApproval of the L-3 Communications NGT 9000/9000R ADS-B system installedSTC SA4270SWMount collision avoidance lights in engine nacelle.STC SA04195NYInstallation of the KFC 230 Aerocruze Automatic Flight Control System (FCS) upgraded from KFC 200 FCSSTC SA09856ACInstallation of BendixKing Aerowave 100 In-flight Data Link System for non-essential, non-required aircraft Cabin Systems & EquipmentsSTC SA11174SC PAGE 1Installation of BendixKing by Honeywell KSN 770 and KSN 765 WAAS LPV approach capable nav/comm systemsSTC SA02265SEInstallation of a camera housingSTC SA01316LAInstallation of Sandel Avionics Terrain Awareness and Warning System.STC SA01815LAInstallation of Sandel Avionics SN3500 Electronic Horizontal Situation Indicator (EHSI).STC SA10236SCInstallation of a GDC 31 Roll Steering ConverterSTC SA03317CHInstallation of Max-Viz EVS-600 Enhanced Vision SystemSTC SA02268CHInstallation of Airwolf Filter Corp. Air Oil SeparatorSTC SA00997WI-DInstallation of Bendix/King KFC 225 Automatic Flight Control System. For Model 421C, serial numbers 421C0401 and after.STC SA00998WI-DInstallation of Bendix/King KMD 550/850 Multi-Function Display, with optional KLN 94 Global Positioning System, KGP 560 General Aviation Enhanced Ground Proximity Warning System, RDR 2000 Weather Radar System and KMH 880 Multi-Hazard Awareness System or KTA 870 Traffic Awareness System.STC SA1246CEInstallation of King KFC-200 2 axis (3 optional) flight control system with a KI-255 (or -256) flight command indicator or a KG-258 Attitude Horizon Gyro with a KC-292 Mode Controller.STC SA1521CE-DInstallation of King KFC 250 flight control system (3 axis) using 3-inch or 4-inch indicators.STC SA1526CE-DInstallation of King KAS 297 Altitude Selector OptionSTC SA01452CHInstallation of an air ambulance conversion kit.STC SA01714WIInstallation 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.STC SA01750SEFabrication and Installation of Dahlia DoublerSTC SA01751SEFabrication and Installation of Panida DoublerSTC SA01752SEFabrication and Installation of Panida Doubler.STC SA8RMInstallation of a vapor cycle air-conditioning systemSTC SA00344BO PAGE 1Installation of Parmetheus Plus LED PAR36 and PAR46 taxi and landing lights.STC SA00057SEInstallation of emergency medical stretcher, oxygen, and electrical systems.STC SA02838ATInstallation of a Strobe Light SystemSTC SA00571SEReplacement of certain BF Goodrich pneumatic deicer boots.STC SA01213CHInstall air ambulance conversion in accordance with Spectrum Aeromed Inc. Drawings as listed on AML SA01213CH, or later FAA approved revision.STC SA00744DEInstallation of the Automatic Dependent Surveillance Broadcast (ADS-B) Out Equipment using a Trig Avionics TT31 Transponder and an approved position sensor