Aircraft STC directory

Learjet 25D STCs

The Jun 30, 2026 FAA DRS snapshot contains 54 selected supplemental type certificates with status Current whose public applicability data names the Learjet 25D. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.

54

listed Current at snapshot

24

holder directories

12

modification categories

Sep 15, 2025

latest recorded revision

Recently revised 25D STCs

Showing the 54 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.

ST12087CHCabin and interiorsRevised Sep 15, 2025

Installation replacement Cabin/Cockpit Handheld Fire Extinguishers.

FAA holder: Avcon Industries Inc.

ST02097SEAvionicsRevised Apr 9, 2025

Installation of replacement circuit boards for the FC-110 autopilot.

FAA holder: Symetric Industries, DBA Extant Aerospace

ST02416SEOther aircraft modificationsRevised Apr 9, 2025

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 modificationsRevised Apr 9, 2025

Installation of the replacement stall warning vertical accelerometer, Butler National Part Number 02904001-101.

FAA holder: Symetric Industries, DBA Extant Aerospace

ST00738WIOther aircraft modificationsRevised Feb 27, 2025

Increased service life. Data required.

FAA holder: Phoenix Air Group Inc.

ST01138DEOther aircraft modificationsRevised Jul 27, 2024

Installation of MidContinent MD23 standby altimeter and/or attitude indicators.

FAA holder: Butler National Corporation

ST04728NYCabin and interiorsRevised May 30, 2024

Installation of LAI CoolView Cabin Window.

FAA holder: Lee Aerospace Inc.

ST00814WILanding gear and brakesRevised May 29, 2024

Landing Gear Life Extension.

FAA holder: Phoenix Air Group Inc.

ST00999WIElectrical systemsRevised May 29, 2024

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.

ST04575ATOther aircraft modificationsRevised Dec 5, 2023

Installation of the Rockwell Collins ALT-1000+/ -4000+ with 5G Filtering.

FAA holder: Chippewa Aerospace Inc.

ST01682WICabin and interiorsRevised Mar 1, 2023

Installation of Heads Up Technologies (HUT) Cabin Entertainment System (CES).

FAA holder: Heads Up Technologies Inc.

ST02230SEAvionicsRevised Jul 27, 2021

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

ST02681AT-DCabin and interiorsRevised Jan 8, 2020

Installation of Cockpit / Cabin Blower Assy.

FAA holder: Summit Aviation Inc

SA1670SWEngine and powerplantRevised Apr 1, 2019

Installation of engine thrust reversers.

FAA holder: The NORDAM Group LLC

ST10472SCEngine and powerplantRevised Apr 1, 2019

Replacement Thrust Reverser Accumulator for the TR3000 Thrust Reverser System.

FAA holder: The NORDAM Group LLC

SA4999NMOther aircraft modificationsRevised Mar 10, 2019

Installation of lifeport patient loading and support system.

FAA holder: LifePort LLC

SA1639GLCargo and special missionRevised Feb 28, 2019

Install air ambulance conversion.

FAA holder: Spectrum Aeromed LLC dba Spectrum Aeromed

ST00373BOAvionicsRevised Oct 15, 2018

Installation of Rockwell Collins TDR-94D Transponders with ADS-B Out.

FAA holder: Pro Star Aviation, LLC

ST00226BOOther aircraft modificationsRevised Sep 13, 2018

Installation of Honeywell CAS-67A Airborne Collision Avoidance System (ACAS II) with dual MST-67A Mode S Transponders and copilot's Intercontinental Dynamics Corporation encoding altimeter with Static Defect Correction Module.

FAA holder: Pro Star Aviation, LLC

ST02500SEAvionicsRevised Sep 7, 2016

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 systemsRevised Sep 1, 2016

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

ST02583LAEngine and powerplantRevised Jul 1, 2016

Modification of the Engine Exhaust system that installs the Alloy Aerospace, Inc. hush kit on Learjet 20 series aircraft.

FAA holder: Alloy Aerospace Inc

ST02121CHOther aircraft modificationsRevised Apr 11, 2016

Certification for Reduced Vertical Separation Minimum (RVSM) operational capability and installation of dual Honeywell AM-250 Altimeters and Rosemount model 0856NA Pitot-Static Probes.

FAA holder: Flight Test Aerospace, Inc

ST01733WIOther aircraft modificationsRevised Dec 22, 2015

Installation of the Quiet Lear Hushkit or Avcon Noise Suppressor.

FAA holder: Butler National Corporation

ST04238ATOther aircraft modificationsRevised Oct 28, 2015

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 structuresRevised Apr 27, 2015

Installation of Internal Wing Hardpoints.

FAA holder: Avcon Industries Inc

ST02316LALanding gear and brakesRevised Sep 22, 2014

Installation of a Crane Aerospace & Electronics Tire Sensor Assembly.

FAA holder: ELDEC Corporation

ST01734WISafety and emergency equipmentRevised Feb 3, 2014

Installation of an Emergency Pneumatic Reservoir Assembly, EAS P/N 1260001-02.

FAA holder: EAS Corporation

ST03132CHAircraft connectivityRevised Aug 3, 2012

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

ST01271WIOther aircraft modificationsRevised Nov 15, 2011

Installation of IS&S Air Data Computer System Update with Rosemount Static Probes and associated equipment in Learjet series aircraft to obtain Reduced Vertical Separation Minimum approval.

FAA holder: Global Aviation Technologies

ST00462LAEngine and powerplantRevised Aug 17, 2011

Modification of the engine exhaust system.

FAA holder: Rooke Corporation dba Aviation Equipment

SA900NWFlight controlsRevised Nov 16, 2010

: Installation of the Mark II performance system, including recontoured wing leading edge, recontoured flap leading edge, wing vortex generator removal, installation of wing stall strips and other minor refinements in accordance with Avcon Master Drawing List No. 1086 dated November 16, 2010, or later FAA approved revision. An FAA approved Airplane Flight Manual Supplement is required for each model.

FAA holder: Avcon Industries Inc

SA1489CECargo and special missionRevised Nov 15, 2010

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

ST01195WIOther aircraft modificationsRevised Jul 24, 2009

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

ST00432WIOther aircraft modificationsRevised Mar 30, 2009

Installation of Avcon fins(Aft Body Strakes).

FAA holder: Avcon Industries Inc

ST02401CHAvionicsRevised Sep 25, 2008

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.

ST02356CHAircraft connectivityRevised Sep 15, 2008

Installation of Top-Mounted TCAS Directional Antenna Structural Provisions.

FAA holder: Stevens Aviation Inc.

ST02399CHAvionicsRevised Sep 15, 2008

Installation of a Universal Avionics EFI-890R Electronic Flight Instrument System.

FAA holder: Stevens Aviation Inc.

ST02402CHAvionicsRevised Sep 15, 2008

Installation of an L3 Avionics GH-3100 Electronic Standby Instrument System (ESIS).

FAA holder: Stevens Aviation Inc.

ST02403CHAvionicsRevised Sep 15, 2008

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.

ST01842SEAvionicsRevised Jul 31, 2008

Installation of a Sandel Avionics Horizontal Situation Indicator (HSI) and Attitude Direction Indicator (ADI).

FAA holder: Butler National Corporation

ST02400CHOther aircraft modificationsRevised Jul 25, 2008

Installation of dual Rockwell Collins AHS-1000A Attitude Heading Reference Systems.

FAA holder: Stevens Aviation Inc.

ST10617SCAircraft structuresRevised May 11, 2007

Installation of a window shade system assembly.

FAA holder: Lou Martin & Associates

SA30GLEngine and powerplantRevised Apr 30, 2007

Installation of electronic engine synchronizer system.

FAA holder: Ontic Engineering and Manufacturing Inc.

ST02265CHEngine and powerplantRevised Mar 28, 2006

Installation of Thrust Reverser Hydraulic System Modifications that were previously installed by STC SA1731SW, SA1669SW or SA1670SW.

FAA holder: Leading Edge Designs LLC

ST01904CHAvionicsRevised Aug 15, 2005

Installation of IS&S Air Data Display Units 9D-80130-15, Analog Interface Unit 9B-81040-30, and Rosemount model 0856NA pitot-static probes. Limited to Learjet 24 models with MKII wings, 300 kts Vmo airspeed limitation, and JET FC-110 autopilot. Excludes serial numbers 25-337, 25-352, 25-361, and 25-370 through 25-372.

FAA holder: Royal Air Inc

ST02016CHOther aircraft modificationsRevised Aug 15, 2005

Certification for Reduced Vertical Separation Minimum (RVSM) operational capability. Excluding serial numbers 25-337, 25-352, 25-361, and 25-370 through 25-372.

FAA holder: Royal Air Inc

ST00578DEOther aircraft modificationsRevised Mar 17, 2005

Reduce number of passenger seats installed from 8 to 4 passengers.

FAA holder: International Jet Aviation Services

SA1170CECabin and interiorsRevised May 3, 2004

Stretcher installation in cabin area.

FAA holder: Med-Flite of Midamerica Inc

ST00361DESafety and emergency equipmentRevised Feb 4, 2004

Installation of Puritan Bennett or B/E Aerospace Sweep on 2000 or Zodiac Intertechnique EROS crew oxygen mask.

FAA holder: West Star Aviation

ST10079SCCabin and interiorsRevised Dec 18, 2002

Installation of a Class E cargo interior in accordance with Master Document List number 106-005, Rev. G, dated November 27, 2002, or later FAA approved revision. FAA approved Airplane Flight Manual Supplement report number 106-101, Rev. IR, dated December 18, 2002, or later FAA approved revision is required.

FAA holder: Addison Express LLC

ST09992SCAircraft performanceRevised Jun 11, 2002

Replace existing production installed S-225 series Mach Airspeed Indicators with REVUE THOMMEN AG Type 5C18.22.65K.00.0 Mach Airspeed Indicators.

FAA holder: Underwood - Instrument Services, Inc.

SA944NWOther aircraft modificationsRevised Dec 5, 2000

Installation of the XR Drag Reduction System.

FAA holder: Avcon Industries Inc

SA2876WEOther aircraft modificationsRevised Jan 31, 2000

Installation of vertical tail floodlights on the horizontal stabilizer.

FAA holder: DeVore Aviation Corporation of America, a New Mexico Corporation