ST12087CHCabin and interiors
Installation replacement Cabin/Cockpit Handheld Fire Extinguishers.
FAA holder: Avcon Industries Inc.
Aircraft STC directory
Learjet 31A STCs
The Jun 30, 2026 FAA DRS snapshot contains 69 selected supplemental type certificates with status Current whose public applicability data names the Learjet 31A. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
69
listed Current at snapshot
34
holder directories
12
modification categories
Sep 15, 2025
latest recorded revision
Modification demand surface
Other aircraft modifications22
Avionics14
Safety and emergency equipment9
Cabin and interiors5
Aircraft structures5
Aircraft connectivity5
Electrical systems3
Engine and powerplant2
Landing gear and brakes1
Fuel systems1
Cargo and special mission1
Flight controls1
Recorded holders
Learjet Inc.10Butler National Corporation4Global Aviation Tech LLC4Duncan Aviation Inc4Avcon Industries Inc3LifePort LLC3Global Aviation Technologies3Lee Aerospace Inc.2Peregrine2Aero-Dienst GmbH & Co KG2DC Aerospace LLC2JetCorp2Amphenol Cable and Interconnect Technologies Inc.1Chippewa Aerospace, Inc.1Raisbeck Engineering Inc.1Heads Up Technologies Inc.1Summit Aviation Inc.1Air Comm Corporation1The NORDAM Group LLC1Pro Star Aviation, LLC1
Recently revised 31A STCs
Showing the 69 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
View record
ST02529CHOther aircraft modifications
Installation of XM Weather Receiver and Data Port.
FAA holder: Amphenol Cable and Interconnect Technologies Inc.
ST01138DEOther aircraft modifications
Installation of MidContinent MD23 standby altimeter and/or attitude indicators.
FAA holder: Butler National Corporation
ST04728NYCabin and interiors
Installation of LAI CoolView Cabin Window.
FAA holder: Lee Aerospace Inc.
ST01391WIAvionics
Upgrade of the Universal UNS-1B Flight Management System (FMS) to the UNS-1F FMS.
FAA holder: Global Aviation Tech LLC
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
ST01604WIAvionics
Installation of the Single UNS-1Ew Flight Management System (FMS) with a LPV Monitor 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.
ST00352SEAircraft structures
Installation of an aft fuselage stowage locker.
FAA holder: Raisbeck Engineering 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.
ST04221NYOther aircraft modifications
Installation of LAI Heated Windshields.
FAA holder: Lee Aerospace 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
ST00237SEElectrical systems
Installation of emergency medical stretcher, oxygen, and electrical systems.
FAA holder: LifePort LLC
ST02681AT-DCabin and interiors
Installation of Cockpit / Cabin Blower Assy.
FAA holder: Summit Aviation 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
SA00237SEElectrical systems
Installation of emergency medical stretcher, oxygen, and electrical systems.
FAA holder: LifePort, LLC
ST09366SCOther aircraft modifications
Installation of an Electric-Driven Vapor Cycle air conditioning system.
FAA holder: Air Comm 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
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
ST03894NYOther aircraft modifications
Installation of TCAS TPU67A to B upgrade to Version 7.1 (Honeywell).
FAA holder: Aero-Dienst GmbH & Co KG
ST03883NYAvionics
Installation of Enhanced Surveillance Mode S Transponder Upgrade (Honeywell).
FAA holder: Aero-Dienst GmbH & Co KG
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
SA8148NM-DOther aircraft modifications
Installation of a Collins VHF-22C / D Comm System.
FAA holder: Learjet Inc.
ST02025LA-DOther aircraft modifications
Installation of the Northrop Grumman Dual LITEF LCR-100 Attitude Heading Reference System (AHRS).
FAA holder: Learjet Inc.
ST02027LA-DAvionics
Installation of the Universal Avionics Systems Corporation Dual UNS-1Ew Flight Management System.
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
ST02316LALanding gear and brakes
Installation of a Crane Aerospace & Electronics Tire Sensor Assembly.
FAA holder: ELDEC Corporation
ST01500WIAvionics
Upgrade of the Universal UNS-1C FMS to the UNS-1E FMS.
FAA holder: Global Aviation Technologies
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
ST02921ATOther aircraft modifications
Installation of the Honeywell (Bendix King) Cas67A Traffic Collision Avoidance System (TCAS II).
FAA holder: Contact Aviation LLC
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
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
ST01326WIAircraft structures
Installation of an Aux Window Blower System Upgrade on Learjet Model 31A-144. Data required: 1) LJSC Ltd. Master Document List MDL4049-25207, Revision A, dated March 28, 2005; and 2) LJSC Ltd. Airplane Flight Manual Supplement FMS4049-25207, Revision IR, dated May 4, 2005; or later FAA approved revisions to (1) or (2).
FAA holder: Global Aviation Technologies
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
ST03065AT-DOther aircraft modifications
Installation of a Single Universal UNS-1C+ or UNS-1E Flight Management System.
FAA holder: Learjet Inc
ST00318WI-DSafety and emergency equipment
Installation of an Allied Signal Sundstrand Mark VII Ground Proximity Warning System (GPWS).
FAA holder: Duncan Aviation Inc
ST01024WI-DSafety and emergency equipment
Installation of a Honeywell MK-VIII Enhanced Ground Proximity Warning System (EGPWS).
FAA holder: Duncan Aviation Inc
ST03690ATAircraft connectivity
Installation of TracPlus GPS/Satellite Aircraft Tracking System.
FAA holder: DC Aerospace LLC
ST02663CHOther aircraft modifications
Installation of dual Rockwell Collins AHS-3000S Attitude Heading Reference Systems.
FAA holder: Envoy Aerospace LLC
ST00836CH-DEngine and powerplant
Installation of AlliedSignal Aerospace N1 Digital Electronic Engine Control (DEEC).
FAA holder: Honeywell International 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
ST01724SEFlight controls
Installation of a drag reduction system (contoured flap).
FAA holder: Raisbeck Engineering
ST01412WIOther aircraft modifications
Installation of the Revue Thommen 2 Standby Altimeter.
FAA holder: Revue Thommen AG
ST01727LA-DAircraft connectivity
Installation of a Honeywell KHF-1050 HF Communication System.
FAA holder: Learjet Inc.
ST03275ATSafety and emergency equipment
Installation of a Honeywell Mark VII Enhanced Ground Proximity Warning System (EGPWS).
FAA holder: Averitt Aviation Inc.
ST0836CH-DEngine and powerplant
Installation of Honeywell N1 Digital Electronic Engine Control (DEEC).
FAA holder: Landmark Aviation
ST02242CHAvionics
Installation of a Honeywell MK VII Enhanced Ground Proximity Warning System (EGPWS) with Windshear and Terrain Display.
FAA holder: Alternative Aviation Co
ST00346WI-DOther aircraft modifications
Installation of Allied Signal (Bendix King) CAS 67 TCAS II Traffic Alert and Collision Avoidance System.
FAA holder: Learjet Inc
ST00786WI-DOther aircraft modifications
Installation of Allied Signal MVII Enhanced GPWS/Windshear System.
FAA holder: Learjet Inc
ST01613LA-DSafety and emergency equipment
Installation of a Honeywell KGP-860 Terrain Awareness Warning System (TAWS).
FAA holder: Learjet Inc.
SA1170CECabin and interiors
Stretcher installation in cabin area.
FAA holder: Med-Flite of Midamerica Inc
ST01705NYOther aircraft modifications
Installation must be in accordance with Section 1 of DECA Modification Summary MS02051, Rev 2, dated March 7, 2003.
FAA holder: Logo Tech Manufacturing Inc
ST00361DESafety and emergency equipment
Installation of Puritan Bennett or B/E Aerospace Sweep on 2000 or Zodiac Intertechnique EROS crew oxygen mask.
FAA holder: West Star Aviation
ST01635NYOther aircraft modifications
Installation of insulation blankets.
FAA holder: Magnifoam Technology
ST01056WISafety and emergency equipment
Installation of the Honeywell Enhanced Ground Proximity Warning System (EGPWS) in the Learjet Model 31A airplane. Data Required: (1) JetCorp STC Drawing List No. 63-327L001, revision A, dated February 18, 2002; (2) FAA Approved Airplane Flight Manual Supplement, JetCorp Document No. 63-327B002, revision IR, dated February 20, 2002; or later FAA Approved revisions to (1) or (2).
FAA holder: JetCorp
ST01036WI-DSafety and emergency equipment
Incorporation of a Honeywell MK VIII Enhanced Ground Proximity Warning System.
FAA holder: Learjet Inc.
ST01031WIAvionics
Upgrade of existing Universal Avionics CVR-80 cockpit voice recorder to Universal CVR-30B or CVR-120.
FAA holder: Duncan Aviation Inc