ST12087CHCabin and interiors
Installation replacement Cabin/Cockpit Handheld Fire Extinguishers.
FAA holder: Avcon Industries Inc.
Aircraft STC directory
Learjet 35 STCs
The Jun 30, 2026 FAA DRS snapshot contains 136 selected supplemental type certificates with status Current whose public applicability data names the Learjet 35. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
136
listed Current at snapshot
46
holder directories
12
modification categories
Sep 15, 2025
latest recorded revision
Modification demand surface
Other aircraft modifications59
Avionics32
Safety and emergency equipment9
Cabin and interiors8
Aircraft connectivity8
Electrical systems4
Cargo and special mission4
Fuel systems4
Engine and powerplant3
Landing gear and brakes2
Aircraft structures2
Flight controls1
Recorded holders
Learjet Inc.23Avcon Industries Inc11Butler National Corporation7Stevens Aviation Inc.7West Star Aviation6Phoenix Air Group Inc.5Royal Air Inc4Duncan Aviation Inc4Symetric Industries, DBA Extant Aerospace3Global Aviation Tech LLC3AeroMech Incorporated3Lee Aerospace Inc.2Chippewa Aerospace, Inc.2Peregrine2Summit Aviation Inc.2Blackhawk Aerospace Technologies Inc.2West Star Aviation Inc2Global Aviation Technologies2DC Aerospace LLC2Rockwell Collins Inc2
Recently revised 35 STCs
Showing the 100 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
View record
ST02416SEOther aircraft modifications
Installation of the replacement rate gyro, Butler National Part Number 501-1169-01 MOD A or 501-1169-02 MOD A.
FAA holder: Symetric Industries, DBA Extant Aerospace
ST02417SEOther aircraft modifications
Installation of the replacement stall warning vertical accelerometer, Butler National Part Number 02904001-101.
FAA holder: Symetric Industries, DBA Extant Aerospace
ST02515SEOther aircraft modifications
Installation of the replacement vertical accelerometer, Butler National Part Number 501-1287-02 MOD A.
FAA holder: Symetric Industries, DBA Extant Aerospace
ST00738WIOther aircraft modifications
Increased service life. Data required.
FAA holder: Phoenix Air Group Inc.
ST02036WIAvionics
Installation of an additional Garmin G700 TXi Primary Flight Display or Multifunction Display.
FAA holder: Butler National Corporation
ST01138DEOther aircraft modifications
Installation of MidContinent MD23 standby altimeter and/or attitude indicators.
FAA holder: Butler National Corporation
ST01083DEOther aircraft modifications
Installation of the Aviation Clean Air Airborne Air & Surface Purification System.
FAA holder: Lee Aerospace, Inc.
ST04728NYCabin and interiors
Installation of LAI CoolView Cabin Window.
FAA holder: Lee Aerospace Inc.
SA709NEOther aircraft modifications
Installation of Marquardt MTR-101 Tow Reel System.
FAA holder: Phoenix Air Group Inc.
ST00999WIElectrical systems
Installation of Special Mission Power and Control Wiring, provisions for Carriage of Mission Stores with Hardpoints installed by STC SA1604SO or SA1670CE, and Takeoff weight increased to 16,300 lbs.
FAA holder: Phoenix Air Group Inc.
ST10217SCOther aircraft modifications
Approval of underwing stores including carriage of the MTR101 Tow Reel System (and targets) on the Strongback-Lear (Sentel) hardpoint.
FAA holder: Phoenix Air Group Inc.
ST01517WIOther aircraft modifications
Installation of the Glareshield LED Lighting System.
FAA holder: Global Aviation Tech LLC
ST01602WIOther aircraft modifications
Installation of Luminescent Overlay panels upgrade.
FAA holder: Global Aviation Tech LLC
ST04575ATOther aircraft modifications
Installation of the Rockwell Collins ALT-1000+/ -4000+ with 5G Filtering.
FAA holder: Chippewa Aerospace Inc.
ST01070DEOther aircraft modifications
Installation of the Curtiss-Wright Fortress Flight Data Recorder (with Cockpit Voice Recorder).
FAA holder: Peregrine
ST01682WICabin and interiors
Installation of Heads Up Technologies (HUT) Cabin Entertainment System (CES).
FAA holder: Heads Up Technologies Inc.
ST02635ATOther aircraft modifications
Deactivation of Aeronca (Learjet) Thrust Reversers.
FAA holder: Summit Aviation Inc
ST02230SEAvionics
The installation of dual Garmin GTX-33ES Mode-S transponders and single or dual Garmin GTN 650/750 panel mounted navigation and global positioning system (GPS) units, or dual Garmin GTX-335R and/or GTX-345R Mode-S transponders and single or dual Garmin GTN 650/750/625/725 panel mounted navigation and GPS units.
FAA holder: Butler National Corporation
ST01102WIAvionics
Installation of a Universal Avionics MFD-640 Multi-Function Display.
FAA holder: Blackhawk Aerospace Technologies Inc.
ST01103WIAvionics
Installation of a Universal Avionics (TAWS) Terrain Awareness and Avoidance System.
FAA holder: Blackhawk Aerospace Technologies Inc.
ST04481CHOther aircraft modifications
Replacement of similar functioning circuit and switch for obsolete steering interface unit (SIU) in accordance with Butler National Master Data List 0200 I 020 Revisio n (A) , dat ed 14 MAY 2021, or later FAA Approved Revision.
FAA holder: Butler National Corporation
ST01926WIAvionics
Interface of factory installed FC-530/FC-535 Autopilot System to Single/Dual GTN 750/650 Navigators.
FAA holder: Avcon Industries Inc
ST04447CHAircraft connectivity
Installation of Garmin GTS (TM) 8000 TCAS/ACAS II Traffic Surveillance system, dual GTX (TM) 3000 Mode-S Extended Squitter Transponders and GDL® 88 receiver for a complete ADS-B In/Out capability and a Flight Stream 210 for wireless download connectivity using Garmin Connext®. Installation in accordance with Royal Air Master Document List No. RACB-MDL-3000, Revision A, dated January 06, 2020, or later FAA approved revision.
FAA holder: Royal Air Inc
ST02681AT-DCabin and interiors
Installation of Cockpit / Cabin Blower Assy.
FAA holder: Summit Aviation Inc
ST01178WIElectrical systems
Installation of PWI Electrode Inverter, Glareshield Lighting System.
FAA holder: PWI Inc.
ST02455SEAircraft connectivity
Installation of Dual GTX-3000 Transponders, GDL-88 Automatic Dependent Surveillance-Broadcast (ADS-B) (In) with Wide Area Augmentation System (WAAS) Global Positioning System (GPS) sensor and Flight Stream 210 Bluetooth Connectivity installed for ADS-B (Out) compliance.
FAA holder: Butler National Corporation
SA4836SWOther aircraft modifications
Installation of TR4000 thrust reversers.
FAA holder: The NORDAM Group LLC
SA4999NMOther aircraft modifications
Installation of lifeport patient loading and support system.
FAA holder: LifePort LLC
SA1639GLCargo and special mission
Install air ambulance conversion.
FAA holder: Spectrum Aeromed LLC dba Spectrum Aeromed
ST01122SE-DOther aircraft modifications
Group aircraft approval for Reduced Vertical Separation Minimum (RVSM).
FAA holder: Avcon Industries Inc
SA2475CECabin and interiors
Installation of provisions for a cabin centerline mounted camera with an in-flight opening door.
FAA holder: Avcon Industries, Inc
SA2476CEFuel systems
Installation of Learjet Model 36A fuselage fuel cells.
FAA holder: Avcon Industries, Inc
ST00373BOAvionics
Installation of Rockwell Collins TDR-94D Transponders with ADS-B Out.
FAA holder: Pro Star Aviation, LLC
ST04270CHAvionics
Installation of the Mid-Continent Instruments and Avionics Model MD302 Standby Attitude Module.
FAA holder: Haggan Aviation
SA2288SWAvionics
Installation of Litton LTN-104 inertial navigation system.
FAA holder: Associated Air Center, Inc. - c/o CT Corporation System
ST03843NYOther aircraft modifications
Installation of a dual AHS-1000 Attitude & Heading System.
FAA holder: Air Alliance GmbH
ST02500SEAvionics
The installation of the Garmin GDL-88 with the Flight Stream 210 to allow ADS-B(In) Flight Information Service Broadcast (FIS-B), independent of the ADS-B(Out) solution compliance.
FAA holder: Butler National Corporation
SA1170GLElectrical systems
Except Model 55: Install Egan Aviation air ambulance stretcher P/N 125 using installation kit P/N 803, inverter/pump kit No. 808, 809, or 810. For Model 55, install air ambulance stretcher P/N 125 using installation kit P/N 804, medical oxygen system kit P/N 807, inverter/pump kit No. 808, 809, or810.
FAA holder: Paul/ Lanna Egan LLC
SA8071NM-DAircraft connectivity
Installation of a Collins AN/ARC-210 Military UHF/VHF/FM Communication System.
FAA holder: Learjet Inc.
SA8095NM-DOther aircraft modifications
Installation of a upper Headliner Installation Ultraliner.
FAA holder: Learjet Inc.
SA8096NM-DOther aircraft modifications
Installation of a Third Audio System, Panel and Console.
FAA holder: Learjet Inc.
SA8102NM-DOther aircraft modifications
A Non-Hazard Installation of a Dornier Aerial Target System Airborne Control Unit (DATS-ACU), Systems Provisions.
FAA holder: Learjet Inc.
SA8163NM-DSafety and emergency equipment
Installation of a Allied Signal Terrain Awareness Warning System.
FAA holder: Learjet Inc
ST01201WI-DOther aircraft modifications
Installation of an Universal UNS-1E Flight Management System.
FAA holder: Learjet Inc.
ST01720LA-DOther aircraft modifications
Dual Honeywell MST-67A Diversity Transponders for Elementary and Enhanced Surveillance.
FAA holder: Learjet Inc.
ST01733LA-DAvionics
Installation of the Universal Avionics Systems Corp. (UASC) CVR-120 Digital Cockpit Voice Recorder (CVR), as a replacement for existing UASC CVR-XXX CVRs.
FAA holder: Learjet Inc.
ST00322DE-DSafety and emergency equipment
Installation of Artex ELT 110-406 or C406-2 emergency locator transmitter.
FAA holder: Learjet Inc.
ST04238ATOther aircraft modifications
Upgrade of Honeywell Traffic Collision Avoidance Systems II (TCAS II) Processor Software from TCAS II Version 7.0 to TCAS II Version 7.1.
FAA holder: Aviation Partners Group Inc
ST01783WIAircraft structures
Installation of Internal Wing Hardpoints.
FAA holder: Avcon Industries Inc
ST00579DEOther aircraft modifications
Installation of Pitot-Static probes with their associated Pitot and static system modifications.
FAA holder: AeroMech Incorporated
ST04198ATAvionics
Installation of a single Universal Avionics UNS-1Lw Flight Management System (FMS) with LPV monitor to provide WAAS capability.
FAA holder: Stevens Aviation Inc.
ST01356NYAvionics
Installation of Aerosensing Radar Mapping System.
FAA holder: Sikorsky Aircraft Corporation
ST02316LALanding gear and brakes
Installation of a Crane Aerospace & Electronics Tire Sensor Assembly.
FAA holder: ELDEC Corporation
ST02925NYCabin and interiors
Replacement of Cabin Lighting Light Bulbs with LED s (Light-Emitting Diode) Light Bulbs.
FAA holder: Delta Engineering Corporation
ST01734WISafety and emergency equipment
Installation of an Emergency Pneumatic Reservoir Assembly, EAS P/N 1260001-02.
FAA holder: EAS Corporation
ST01662CH-DAvionics
Installation of a Honeywell Mark VIII Enhanced Ground Proximity Warning System, EGPWS with video display of terrain.
FAA holder: Standard Aero
ST00649CHOther aircraft modifications
Install TFE731-3-2AP engines modified by STC SE00648CH.
FAA holder: International turbine Industries
ST02259ATOther aircraft modifications
Permanent deactivation of Aeronca thrust reverses.
FAA holder: Bankair, Inc
ST03100CHAvionics
Installation of dual Universal Avionics Systems Corporation UNS-1Fw or UNS-1Lw Flight Management Systems.
FAA holder: West Star Aviation Inc
ST03132CHAircraft connectivity
Installation of a single or dual Collins TDR-94/94D Mode S Transponder using existing control head, aircraft wiring, and antenna(s).
FAA holder: Royal Air Inc
ST02419LACargo and special mission
Modifies aircraft originally outfitted with a 24-inch wide executive door to accommodate the standard 36-inch wide cargo door.
FAA holder: Leading Edge Designs LLC
ST01988NY-DOther aircraft modifications
Installation of a Collins TCAS-4000.
FAA holder: Contact Aviation LLC
ST01289WIFuel systems
Installation of a Davtron Fuel Temperature System. Data Required: 1) LJSC, Ltd. Master Document List MDL4035-28280, Revision B, dated November 19, 2004; and 2) LJSC, Ltd. Airplane Flight Manual Supplement FMS4035-28280, Revision NC, dated November 19, 2004; or later FAA approved revisions to (1) or (2).
FAA holder: Global Aviation Technologies
ST01295WISafety and emergency equipment
Installation of a Honeywell Mark VIII Enhanced Ground Proximity Warning System (EGPWS).
FAA holder: Global Aviation Technologies
ST01358WIAvionics
Upgrade of the Universal UNS-1M Flight Management System (FMS) to the UNS-1E FMS.
FAA holder: Global Aviation Tech LLC
SA996EAFuel systems
Installation of Shaw Aero fuel filler cap P/Ns 457-2, -266, -370, 431, -9R, -125, -1251.
FAA holder: Parker Hannifin Fluid Systems Division
SA1489CECargo and special mission
Removal of 24-inch wide executive door and installation of 36-inch wide cargo door per AVCON Drawing List 36000 stamped FAA Approved with a date of May 8, 1979, July 3, 1980, November 15, 2010, or later approved revision for Learjet Models 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 31, 31A, 35, 35A, 36, and 36A.
FAA holder: Avcon Industries Inc
ST00858WI-DOther aircraft modifications
Installation of Collins TCAS-94 TCAS II system.
FAA holder: Duncan Aviation Inc
ST00952SE-DOther aircraft modifications
Group aircraft approved for Reduced Vertical Separation Minimum (RVSM).
FAA holder: Learjet Inc
ST00013WI-DEngine and powerplant
Installation of a modified engine bleed air mixing valve regulated air source.
FAA holder: Duncan Aviation Inc
ST00077WI-DSafety and emergency equipment
Installation of a Sundstrand Mark VII Ground Proximity/Windshear Warning System.
FAA holder: Duncan Aviation Inc
ST02755CHAvionics
Installation of a Universal Avionics Systems Corporation UNS-1Lw Flight Management System and an LP/LPV Monitor.
FAA holder: West Star Aviation Inc
ST01195WIOther aircraft modifications
Installation of Rosemount Pitot/Static Probes, altimeters, and associated equipment in Learjet 20 series aircraft to obtain Reduced Vertical Separation Minimum approval.
FAA holder: Avcon Industries Inc
ST03690ATAircraft connectivity
Installation of TracPlus GPS/Satellite Aircraft Tracking System.
FAA holder: DC Aerospace LLC
ST00432WIOther aircraft modifications
Installation of Avcon fins(Aft Body Strakes).
FAA holder: Avcon Industries Inc
ST02401CHAvionics
Installation of a Universal Avionics Class A or Class B Terrain Awareness Warning Systems (TAWS) and optional Universal Avionics Vision 1 Synthetic Vision System.
FAA holder: Stevens Aviation Inc.
ST02399CHAvionics
Installation of a Universal Avionics EFI-890R Electronic Flight Instrument System.
FAA holder: Stevens Aviation Inc.
ST02402CHAvionics
Installation of an L3 Avionics GH-3100 Electronic Standby Instrument System (ESIS).
FAA holder: Stevens Aviation Inc.
ST02403CHAvionics
Installation of a single Universal Avionics UNS-1L Flight Management System or single or dual Universal Avionics UNS-1Lw or UNS-1Fw Flight Management Systems.
FAA holder: Stevens Aviation Inc.
ST02597CHOther aircraft modifications
Installation of a Rockwell Collins TCAS 4000 Traffic Alert and Collision Avoidance System (TCAS II).
FAA holder: Stevens Aviation Inc.
ST01842SEAvionics
Installation of a Sandel Avionics Horizontal Situation Indicator (HSI) and Attitude Direction Indicator (ADI).
FAA holder: Butler National Corporation
ST02400CHOther aircraft modifications
Installation of dual Rockwell Collins AHS-1000A Attitude Heading Reference Systems.
FAA holder: Stevens Aviation Inc.
ST00563DE-DOther aircraft modifications
Installation of a Pilots and Co-Pilots Upgraded Altimeter System.
FAA holder: AeroMech Incorporated
ST00836CH-DEngine and powerplant
Installation of AlliedSignal Aerospace N1 Digital Electronic Engine Control (DEEC).
FAA holder: Honeywell International Inc
ST00657DEAvionics
Installation of an Intermap Technologies Radar Pod.
FAA holder: Intermap Technologies
ST00932WI-DAvionics
Installation of an Universal Avionics Terrain Awareness and Warning System (TAWS).
FAA holder: Duncan Aviation Inc
ST00653DEAircraft connectivity
Latitude Technologies Corp. SkyNode S200 SATCOM system in Lear Jet Model 31, 31A, 35, 35A, 36, 36A airplanes.
FAA holder: DC Aerospace LLC
ST10617SCAircraft structures
Installation of a window shade system assembly.
FAA holder: Lou Martin & Associates
ST01955LAAvionics
Installation of provisions for terrain mapping radar equipment.
FAA holder: Intermap Technologies
ST01412WIOther aircraft modifications
Installation of the Revue Thommen 2 Standby Altimeter.
FAA holder: Revue Thommen AG
ST01394WI-DOther aircraft modifications
Modification of a Collins CTL-23 or CTL-23C VHF COMM/NAV Control Panel System installation.
FAA holder: Rockwell Collins Inc
ST01325WIOther aircraft modifications
Installation of B/E Aerospace LED Washlighting Assemblies and Dimming Interface Modules.
FAA holder: Eaglejet Aviation Inc.
ST02215CHCabin and interiors
Installation of a one-piece cabin headliner.
FAA holder: West Star Aviation
ST01531SEOther aircraft modifications
Group aircraft approval for Reduced Vertical Separation Minimum (RVSM) are contained in AeroMech Document No. AMI-QD-LJ-0416 Rev. New, dated April 8, 2005 or latest FAA approved revision.
FAA holder: AeroMech Incorporated