ST12087CHCabin and interiors
Installation replacement Cabin/Cockpit Handheld Fire Extinguishers.
FAA holder: Avcon Industries Inc.
Aircraft STC directory
Learjet 25 STCs
The Jun 30, 2026 FAA DRS snapshot contains 62 selected supplemental type certificates with status Current whose public applicability data names the Learjet 25. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
62
listed Current at snapshot
28
holder directories
13
modification categories
Sep 15, 2025
latest recorded revision
Modification demand surface
Other aircraft modifications20
Avionics12
Cabin and interiors6
Engine and powerplant6
Cargo and special mission3
Aircraft structures3
Landing gear and brakes2
Electrical systems2
Safety and emergency equipment2
Aircraft connectivity2
Flight controls2
Fuel systems1
Aircraft performance1
Recorded holders
Avcon Industries Inc7Stevens Aviation Inc.6Butler National Corporation5Symetric Industries, DBA Extant Aerospace3Phoenix Air Group Inc.3Royal Air Inc3Summit Aviation Inc.2The NORDAM Group LLC2Pro Star Aviation, LLC2Ontic Engineering and Manufacturing Inc.2Acron Aviation Inc.1Lee Aerospace Inc.1Chippewa Aerospace, Inc.1Heads Up Technologies Inc.1Med-Pac Inc.1LifePort LLC1Spectrum Aeromed LLC dba Spectrum Aeromed1Peregrine1Paul/ Lanna Egan LLC1Flight Test Aerospace, Inc1
Recently revised 25 STCs
Showing the 62 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
View record
ST02097SEAvionics
Installation of replacement circuit boards for the FC-110 autopilot.
FAA holder: Symetric Industries, DBA Extant Aerospace
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
ST01308WIAvionics
Installation of L-3 Communications Avionics Systems Inc. (Landmark) Terrain Awareness Warning System (TAWS) model TAWS8100.
FAA holder: Acron Aviation Inc.
ST00738WIOther aircraft modifications
Increased service life. Data required.
FAA holder: Phoenix Air Group 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.
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.
ST04575ATOther aircraft modifications
Installation of the Rockwell Collins ALT-1000+/ -4000+ with 5G Filtering.
FAA holder: Chippewa Aerospace Inc.
SA01858AT-DAvionics
Installation of a BF Goodrich Avionics Systems, Inc. TCAS791/A TCAS I system.
FAA holder: Summit Aviation Inc
ST01682WICabin and interiors
Installation of Heads Up Technologies (HUT) Cabin Entertainment System (CES).
FAA holder: Heads Up Technologies 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
ST02681AT-DCabin and interiors
Installation of Cockpit / Cabin Blower Assy.
FAA holder: Summit Aviation Inc
SA01452CHCargo and special mission
Installation of an air ambulance conversion kit.
FAA holder: Med-Pac Inc.
SA1670SWEngine and powerplant
Installation of engine thrust reversers.
FAA holder: The NORDAM Group LLC
ST10472SCEngine and powerplant
Replacement Thrust Reverser Accumulator for the TR3000 Thrust Reverser System.
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
ST00790DEOther aircraft modifications
Installation of BendixKing CAS 67B Traffic Alert and Collision Avoidance System (TCAS) II Version 7.1.
FAA holder: Peregrine
ST00373BOAvionics
Installation of Rockwell Collins TDR-94D Transponders with ADS-B Out.
FAA holder: Pro Star Aviation, LLC
ST00226BOOther aircraft modifications
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
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
ST02121CHOther aircraft modifications
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 modifications
Installation of the Quiet Lear Hushkit or Avcon Noise Suppressor.
FAA holder: Butler National Corporation
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
ST01734WISafety and emergency equipment
Installation of an Emergency Pneumatic Reservoir Assembly, EAS P/N 1260001-02.
FAA holder: EAS Corporation
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
ST00749DEOther aircraft modifications
Installation of optical glass in forward left hand and forward right hand passenger windows.
FAA holder: Stratton Park Engineering Company Incorporated
ST01271WIOther aircraft modifications
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 powerplant
Modification of the engine exhaust system.
FAA holder: Rooke Corporation dba Aviation Equipment
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
SA900NWFlight controls
: 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 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
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
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.
ST02356CHAircraft connectivity
Installation of Top-Mounted TCAS Directional Antenna Structural Provisions.
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.
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.
ST10617SCAircraft structures
Installation of a window shade system assembly.
FAA holder: Lou Martin & Associates
SA30GLEngine and powerplant
Installation of electronic engine synchronizer system.
FAA holder: Ontic Engineering and Manufacturing Inc.
SA412CEEngine and powerplant
Installation of Woodward Electronic Engine synchronizer system.
FAA holder: Ontic Engineering and Manufacturing Inc.
ST02265CHEngine and powerplant
Installation of Thrust Reverser Hydraulic System Modifications that were previously installed by STC SA1731SW, SA1669SW or SA1670SW.
FAA holder: Leading Edge Designs LLC
ST01904CHAvionics
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 modifications
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
ST00550DEAircraft structures
Modification and installation of an optical glass in forward right hand passenger window.
FAA holder: SPEC 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
SA3343NMOther aircraft modifications
Cockpit Sun Visor installation.
FAA holder: Rosen Sunvisor Systems LLC
ST10079SCCabin and interiors
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 performance
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 modifications
Installation of the XR Drag Reduction System.
FAA holder: Avcon Industries Inc
SA2876WEOther aircraft modifications
Installation of vertical tail floodlights on the horizontal stabilizer.
FAA holder: DeVore Aviation Corporation of America, a New Mexico Corporation