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
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.
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Installation of XM Weather Receiver and Data Port.
FAA holder: Amphenol Cable and Interconnect Technologies Inc.
Installation of MidContinent MD23 standby altimeter and/or attitude indicators.
FAA holder: Butler National Corporation
Installation of LAI CoolView Cabin Window.
FAA holder: Lee Aerospace Inc.
Upgrade of the Universal UNS-1B Flight Management System (FMS) to the UNS-1F FMS.
FAA holder: Global Aviation Tech LLC
Installation of the Glareshield LED Lighting System.
FAA holder: Global Aviation Tech LLC
Installation of Luminescent Overlay panels upgrade.
FAA holder: Global Aviation Tech LLC
Installation of the Single UNS-1Ew Flight Management System (FMS) with a LPV Monitor upgrade.
FAA holder: Global Aviation Tech LLC
Installation of the Rockwell Collins ALT-1000+/ -4000+ with 5G Filtering.
FAA holder: Chippewa Aerospace Inc.
Installation of an aft fuselage stowage locker.
FAA holder: Raisbeck Engineering Inc.
Installation of Heads Up Technologies (HUT) Cabin Entertainment System (CES).
FAA holder: Heads Up Technologies Inc.
Installation of LAI Heated Windshields.
FAA holder: Lee Aerospace Inc.
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
Installation of Cockpit / Cabin Blower Assy.
FAA holder: Summit Aviation Inc
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
Installation of an Electric-Driven Vapor Cycle air conditioning system.
FAA holder: Air Comm Corporation
Installation of TR4000 thrust reversers.
FAA holder: The NORDAM Group LLC
Installation of Rockwell Collins TDR-94D Transponders with ADS-B Out.
FAA holder: Pro Star Aviation, LLC
Installation of TCAS TPU67A to B upgrade to Version 7.1 (Honeywell).
FAA holder: Aero-Dienst GmbH & Co KG
Installation of Enhanced Surveillance Mode S Transponder Upgrade (Honeywell).
FAA holder: Aero-Dienst GmbH & Co KG
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Installation of Internal Wing Hardpoints.
FAA holder: Avcon Industries Inc
Installation of a Crane Aerospace & Electronics Tire Sensor Assembly.
FAA holder: ELDEC Corporation
Upgrade of the Universal UNS-1C FMS to the UNS-1E FMS.
FAA holder: Global Aviation Technologies
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
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
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Installation of TracPlus GPS/Satellite Aircraft Tracking System.
FAA holder: DC Aerospace LLC
Installation of AlliedSignal Aerospace N1 Digital Electronic Engine Control (DEEC).
FAA holder: Honeywell International Inc
Installation of a window shade system assembly.
FAA holder: Lou Martin & Associates
Installation of a drag reduction system (contoured flap).
FAA holder: Raisbeck Engineering
Installation of the Revue Thommen 2 Standby Altimeter.
FAA holder: Revue Thommen AG
Installation of Honeywell N1 Digital Electronic Engine Control (DEEC).
FAA holder: Landmark Aviation
Stretcher installation in cabin area.
FAA holder: Med-Flite of Midamerica Inc
Installation of insulation blankets.
FAA holder: Magnifoam Technology
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