Cessna 421

STCs that may be installed · 248

In force first, then newest. The registry doesn’t record which STCs an aircraft has.

Query with SQL
duckdb -csv -c "SELECT s.stc_number, s.description, s.holder, s.status, s.status_date, m.matched_model
  FROM (
    SELECT stc_number, min(matched_model) AS matched_model
    FROM 'https://openairdocs.org/data/latest/faa_aircraft_model_stc.parquet'
    WHERE aircraft_model_code IN ('2076010')
    GROUP BY stc_number
  ) m JOIN 'https://openairdocs.org/data/latest/faa_stc.parquet' s USING (stc_number)
  ORDER BY 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.

STC SA1755SOInstallation of Allied/Bendix microwave landing system, MLS-20A.AlliedSignal Commercial Avionics SystemsSTC SA2063SOInstallation of stretcher system.National Jets, IncSTC SA660WEInstallation of HRD-type fire extinguishing system. (AND STC SA111WE)Pacific ScientificSTC SA3283NMInstallation of ARNAV Systems FC-10/FT 10 digital fuel flow indicating system.Arnav SystemsSTC SA2721NMInstallation of a turbocharger bypass exhaust elbow.Heliarc Welding Service Inc.STC SA169RMInstallation of exhaust stacks.Heliarc Welding Service Inc.STC SA968SWMitchell automatic flight system AK279 consisting of Century III autopilot with optional automatic pitch trim, radio couplers, automatic aileron stabilizer.Century Flight Systems IncSTC SA1418SOReplacement of rotor vanes in Airborne 211CC and 212CW vacuum pumps. (See limitations)Aircraft Products Supply Co IncSTC SA2190NM PAGE 1Installation of electronics International Digital Volt/Amp Gauges and Accessories.Electronics InternationalSTC SA607GLInstallation of a Shadin Company 910502, 910504, or 910514 fuel flow indicating system.Shadin AvionicsSTC SA5426SWInstallation of Texas Instruments Model TI 9100 Loran C navigator.Texas Instruments, IncSTC SA1867CEDC powered windshield installation. (421C EXCEPT 421C0801 THRU 421C1400)Wilco IncSTC SA1515NMCrossover exhaust pipe assembly.Heliarc Welding Service Inc.STC SA2656SWAddition of Hydro Seal Fluid Additive to nose and main gear shock struts.Granville Lasseter/dba Granville's Aircraft Strut SealantSTC SA1210CEInstallation of Hanlon & Wilson exhaust systems, P/N 8108-59 and P/N 8109-59 or P/N8108-159 and 8109-159.Hanlon & Wilson, IncSTC SA2386SWInstallation of S.A.F.E., EGT, CHT Systems.Avicon Development CorporationSTC SA1393CEInstall forward baggage door warning system.Wells Aircraft, IncSTC SA108RMModify exhaust stacks by replacing existing bellows or seal type joints with a clampless, sealess type slip joint.Heliarc Welding Service Inc.STC SA1375CEReduce height of existing survival seat.Sierra Research CorpSTC SA1343CEInstall Sierra data console on left hand seat rails.Sierra Research CorpSTC SA102RMInstallation of exhaust turbo connector, P/N 042177-5.Heliarc Welding Service Inc.STC SA465SOInstallation of Bendix FCS-810 automatic flight control system including flight director indicator DH-841( ) and manual electric trim.Bendix Corporation Avionics DivSTC SA591EAInstallation of Radome Part Part No. 3084X.Norton Company, Performance PlacticsSTC SA107GLConversion of oil lubricated de-ice pumps and related hardware to Airborne dry air pump 400 series conversion kits.Airborne Manufacturing CoSTC SA1675WEInstallation of exhaust gas temperature monitoring systems EGT-2.K S Avionics, IncSTC SA1642WEModification of exhaust system components.Wooley Tool & Mfg DivSTC SA3RMModification of engine exhaust stacks by replacement of expansion joint with slip fit joint.Heliarc Welding Svc IncSTC SA632SOInstallation of Bendix Model M-4C automatic flight control system, including manual electric trim.Bendix Corporation Avionics DivSTC SA798EAInstallation of Monitair exhaust gas combustion monitor kit.Rosemount Engineering CoSTC SA794CEInstall vapor cycle air conditioning system.Janitrol Aero DivisionSTC SA240WEConsolidation of STCs SA355CE and SA362CE into one STC having MASTER ELIGIBILITY LIST - amended to include improved power supply assembly and subchassis timer assembly for Twilighter MK III high intensity supplementary lighting system.Symbolic Displays, IncSTC SA536CEInstall electrical connectors in pressure bulkhead(s) at Station(s) 100 and/or 273.94.Peacock Charles OSTC SA661EAInstallation of Radome Kit No. 3084K for Bendix RDR-100 or RDR-110 series radar systems 12-inch antenna.Norton CompanySTC SA2105WEInstallation of Model EGT-3 exhaust gas temperature monitor(with rising temperature alarm). (DC-6B (NAVY R6D-1Z) 680)K S Avionics, IncSTC SA1200CEInstallation of FiQuench cabin and/or engine fire extinguishant system.Enk Aviation CorporationSTC SA3017WEInstallation of fuel flow instruments.Silver Instruments IncSTC SA662CEInstallation of Jet Electronics & Technology, Inc. Model FC120A autopilot.Jet Electronics & TechnologySTC SA673CEInstall Hartzell HC-B3WF-2/9349-3 propellers.Hartzell Propeller IncSTC SA978SWCollins FD108 flight director system.Aircraftsmen IncSTC SA00765DE PAGE 1Installation of Automatic Dependent Surveillance Broadcast (ADS-B) Out functionality using the BendixKing KT74 Transponder and qualified position sensorPeregrineSTC SA02153LA-DInstallation of Garmin G600 Primary Flight Display (PFD) and Multifunction Display (MFD) SystemGarmin International IncSTC ST01085LAInstallation of the VNS 1000 Voice Navigation System.VNS IncorporatedSTC SA00281BO PAGE 1Installation of Avidyne Corporation MLX770 MultiLink Broadcast Transceiver P/N 700-00163-( ), Sensor Systems Inc. Antenna P/N S67-1575-109, or equivalent, and optional Avidyne Mounting Tray P/N 700-00165-000Avidyne CorporationSTC SA02153LAInstallation of Garmin G600 Primary Flight Display (PFD) and Multifunction Display (MFD) System.Garmin AT Inc.STC SA01933LAInstallation of Garmin Model 400W / 500W Series GPS-WAAS Navigation SystemGarmin AT Inc.STC SA5796SWInstallation of Alcor Tru-Flow indicating system, or SDI Hoskins fuel flow indicating system, or Silver Instruments Fueltron fuel flow indicating system.RAM Aircraft Limited PartnershipSTC SA01229SEInstallation of CNX80 GPS WAAS Navigator with integrated VHF Navigation and Communication radios.UPS Aviation TechnologiesSTC SA2350NMInstallation of Electronics International Inc digital carburetor/outside air temperature gauges listed on the attached continuation sheet and the associated accessories.Electronics International
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