# N254FS: 1999 Learjet 45

- Status: Valid registration
- Airframe: [Learjet 45](https://openairdocs.org/model/learjet-45) (registry code 5170805, 12 seats)
- Engine: [Honeywell TFE-731-SER series](https://openairdocs.org/engine/honeywell-tfe-731-ser-series) (registry code 33902)
- Data sheets: [TCDS T00008WI](https://openairdocs.org/tcds/T00008WI) (Learjet Inc.) (OpenAirDocs)
- Serial number: 058
- Year built: 1999
- Type: Fixed wing multi engine
- Engine type: Turbo-fan
- Airworthiness: Standard, transport
- Airworthiness date: October 27, 2004
- Certificate issued: September 29, 2017
- Expires: September 30, 2027
- Mode S code: A266E8
- Registered owner: [S&S Aviation Management LLC](https://openairdocs.org/faa-owner/S%26S%20AVIATION%20MANAGEMENT%20LLC)
- Location: [Waco, TX](https://openairdocs.org/faa-place/TX/Waco)
- Owner type: LLC
- Owner's area on the map: 31.5216° N, 97.2610° W: Placed by OpenAirDocs at the center of ZIP code 76712, within about 4 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=254FS
- Page: https://openairdocs.org/aircraft/N254FS

From the FAA registry file of October 22, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination. The registry lists only the engine series, so ADs for every Honeywell TFE-731-SER model are included.

## ADs that may apply (OpenAirDocs): 67 in force

### Matched by airframe (Learjet 45)

- [AD 2023-01-05](https://openairdocs.org/ad/2023-01-05): Pneumatic · Learjet 45. Effective Mar 9, 2023
- [AD 2021-23-11](https://openairdocs.org/ad/2021-23-11): Powerplant System · Learjet 45. Effective Jan 10, 2022
- [AD 2021-23-08](https://openairdocs.org/ad/2021-23-08): Wing, Center Box · Learjet 45. Effective Jan 10, 2022
- [AD 2015-12-06](https://openairdocs.org/ad/2015-12-06): Fuselage · Learjet 45. Effective Jul 21, 2015
- [AD 2012-26-15 R1](https://openairdocs.org/ad/2012-26-15-R1): Navigation · Agusta AW139, A318-111, A318-112 and 70 more. Effective Dec 3, 2014
- [AD 2014-13-06](https://openairdocs.org/ad/2014-13-06): Engine Exhaust · Learjet 45. Effective Aug 19, 2014
- [AD 2013-14-07](https://openairdocs.org/ad/2013-14-07): Equipment/Furnishings · Learjet 45. Effective Aug 26, 2013
- [AD 2012-08-08](https://openairdocs.org/ad/2012-08-08): Periodic Inspections · Learjet 45. Effective May 29, 2012
- [AD 2011-25-03](https://openairdocs.org/ad/2011-25-03): Landing Gear · Learjet 45. Effective Jan 23, 2012
- [AD 2011-13-10](https://openairdocs.org/ad/2011-13-10): Powerplant · Learjet 45. Effective Aug 1, 2011
- [AD 2011-04-08](https://openairdocs.org/ad/2011-04-08): Electrical power · Learjet 45. Effective Mar 31, 2011
- [AD 2010-21-19](https://openairdocs.org/ad/2010-21-19): Fire protection · Learjet 45. Effective Nov 18, 2010
- [AD 2010-07-02](https://openairdocs.org/ad/2010-07-02): Integrated navigation units (INUs) · 328 Support Services 328-100, 328-300, Jetstream Model 4101 and 26 more. Effective May 3, 2010
- [AD 2010-06-13](https://openairdocs.org/ad/2010-06-13): Flight controls · Learjet 45. Effective Apr 1, 2010
- [AD 2009-24-22](https://openairdocs.org/ad/2009-24-22): Equipment/Furnishings · Learjet 45. Effective Jan 8, 2010
- [AD 2008-01-03](https://openairdocs.org/ad/2008-01-03): Principal structural elements (PSEs · Learjet 45. Effective Feb 14, 2008
- [AD 2007-17-17](https://openairdocs.org/ad/2007-17-17): Unsealed gaps on the pylon side of the engine firewall · Learjet 31, 31A, 35 and 7 more. Effective Oct 2, 2007
- [AD 2007-09-03](https://openairdocs.org/ad/2007-09-03): Auxiliary power unit (APU) · Learjet 45. Effective May 11, 2007
- [AD 2006-19-04](https://openairdocs.org/ad/2006-19-04): Honeywell COM unit and Mode S transponder · Bombardier BD-700-1A10, BD-700-1A11, 550 and 26 more. Effective Oct 17, 2006
- [AD 2006-10-15](https://openairdocs.org/ad/2006-10-15): Inspection reference numbers (IRNs) · Learjet 45. Effective May 31, 2006
- [AD 2005-24-13](https://openairdocs.org/ad/2005-24-13): Electrical wire bundle for the alternator on the left-hand engine · Learjet 45. Effective Dec 20, 2005
- [AD 2005-01-19](https://openairdocs.org/ad/2005-01-19): Mode S transponders · GARMIN International GTX 330D, GTX 330, GTX 33D and 830 more. Effective Feb 23, 2005
- [AD 2003-17-08](https://openairdocs.org/ad/2003-17-08): Nose landing gear (NLG) squat switch camrod · Learjet 45. Effective Sep 24, 2003
- [AD 2003-16-09](https://openairdocs.org/ad/2003-16-09): Main landing gears (MLG) · Learjet 45. Effective Aug 27, 2003
- [AD 2003-16-19](https://openairdocs.org/ad/2003-16-19): Horizontal Stabilizer Actuator Assembly (HSAA) · Learjet 45. Effective Aug 13, 2003
- [AD 2003-06-51](https://openairdocs.org/ad/2003-06-51): Horizontal stabilizer actuator · Learjet 45. Effective Apr 28, 2003
- [AD 2002-17-01](https://openairdocs.org/ad/2002-17-01): Foot Warm circuit breaker · Learjet 45. Effective Sep 12, 2002
- [AD 2001-03-05](https://openairdocs.org/ad/2001-03-05): Anti-ice Manifold Assembly · Learjet 45. Effective Feb 20, 2001
- [AD 2000-08-13](https://openairdocs.org/ad/2000-08-13): Brakes · Learjet 45. Effective May 15, 2000

### Matched by engine (Honeywell TFE-731-SER series)

- [AD 2019-05-07](https://openairdocs.org/ad/2019-05-07): Turbine Engine Compressor Section · Honeywell International TFE731-20AR, TFE731-20BR, TFE731-20R and 4 more. Effective Apr 25, 2019
- [AD 2016-07-02](https://openairdocs.org/ad/2016-07-02): Failure of the interstage turbine transition duct · Honeywell International TFE731-4, TFE731-4R, TFE731-5AR and 2 more. Effective May 5, 2016
- [AD 2014-12-52](https://openairdocs.org/ad/2014-12-52): Engines · Honeywell International TFE731-20AR, TFE731-20BR, TFE731-20R and 11 more. Effective Jul 28, 2014
- [AD 2012-17-05](https://openairdocs.org/ad/2012-17-05): First stage low-pressure turbine (LPT1) rotor assembly · Honeywell International TFE731-4, TFE731-4R, TFE731-5 and 3 more. Effective Oct 2, 2012
- [AD 2012-16-14](https://openairdocs.org/ad/2012-16-14): LPT2 rotor blades · Honeywell International TFE731-20AR, TFE731-20BR, TFE731-20R and 5 more. Effective Oct 1, 2012
- [AD 2010-06-11](https://openairdocs.org/ad/2010-06-11): Second stage low-pressure compressor rotor (LPCR) discs · Honeywell International TFE731-2, TFE731-2A, TFE731-2C and 16 more. Effective Apr 21, 2010
- [AD 2008-19-12](https://openairdocs.org/ad/2008-19-12): ITT duct · Honeywell International TFE731-4, TFE731-4R, TFE731-5 and 3 more. Effective Oct 27, 2008
- [AD 2008-02-19](https://openairdocs.org/ad/2008-02-19): High pressure (HP) turbine rotor assemblies · Honeywell International TFE731-20AR, TFE731-20BR, TFE731-20R and 15 more. Effective Mar 6, 2008
- [AD 2005-13-07](https://openairdocs.org/ad/2005-13-07): Turbine rotor discs. · Honeywell International TFE731-2, TFE731-2A, TFE731-2B and 12 more. Effective Jul 27, 2005
- [AD 2005-05-15](https://openairdocs.org/ad/2005-05-15): (LPT) stage 1 disks · Honeywell International TFE731-2, TFE731-2C, TFE731-3 and 5 more. Effective Apr 18, 2005
- [AD 2001-23-09](https://openairdocs.org/ad/2001-23-09): Fan Rotor Discs · Honeywell International TFE731-2, TFE731-2A, TFE731-2B and 14 more. Effective Dec 21, 2001
- [AD 2000-15-09](https://openairdocs.org/ad/2000-15-09): HPC Impeller · Honeywell International TFE731-2, TFE731-2A, TFE731-2B and 20 more. Effective Oct 10, 2000
- [AD 98-17-01 R1](https://openairdocs.org/ad/98-17-01-R1): Flex Fuel Tube · Honeywell International TFE731-2, TFE731-2A, TFE731-2B and 14 more. Effective Nov 29, 1999
- [AD 99-07-19](https://openairdocs.org/ad/99-07-19): Tube and Fuel Flow Meter Mounting Bracket · Honeywell International TFE731-40R. Effective Apr 21, 1999
- [AD 98-10-15](https://openairdocs.org/ad/98-10-15): Fuel Line · Honeywell International TFE731-40R. Effective May 19, 1998
- [AD 97-04-03](https://openairdocs.org/ad/97-04-03): First stage low pressure turbine (LPT) seal plates · Honeywell International TFE731-2A, TFE731-3C and TFE731-3CR. Effective May 5, 1997
- [AD 96-05-03](https://openairdocs.org/ad/96-05-03): Fan rotor disks · Honeywell International TFE731-2, TFE731-2A, TFE731-2B and 13 more. Effective Apr 2, 1996
- [AD 96-04-01](https://openairdocs.org/ad/96-04-01): Fan Rotor Assembly · Honeywell International TFE731-2, TFE731-2A, TFE731-2B and 12 more. Effective Mar 15, 1996
- [AD 95-07-02](https://openairdocs.org/ad/95-07-02): Low Pressure Turbine Disks · Honeywell International TFE731-3, TFE731-3A, TFE731-3AR and 3 more. Effective Jun 19, 1995
- [AD 94-23-05](https://openairdocs.org/ad/94-23-05): Honeywell International TFE731-3A and TFE731-3AR. Effective Dec 1, 1994
- [AD 94-07-03](https://openairdocs.org/ad/94-07-03): Turbine Nozzles · Honeywell International TFE731-2A, TFE731-3, TFE731-3A and 4 more. Effective Jun 6, 1994
- [AD 92-02-18](https://openairdocs.org/ad/92-02-18): Inflight Operation · Honeywell International TFE731-5BR. Effective Feb 10, 1993
- [AD 92-21-06](https://openairdocs.org/ad/92-21-06): Low Pressure Turbine (LPT) Rotor Disks · Honeywell International TFE731-2, TFE731-3, TFE731-3A and 2 more. Effective Nov 27, 1992
- [AD 90-24-06](https://openairdocs.org/ad/90-24-06): Thermocouple Lead Assemblies · Honeywell International TFE731-2, TFE731-2A, TFE731-3 and 8 more. Effective Nov 13, 1990
- [AD 90-03-04](https://openairdocs.org/ad/90-03-04): High Pressure Turbine Rotor Discs · Honeywell International TFE731-3, TFE731-3A, TFE731-3AR and 1 more. Effective Feb 22, 1990
- [AD 88-18-03](https://openairdocs.org/ad/88-18-03): High Pressure Turbine Rotor Disc · Honeywell International TFE731-3, TFE731-3A, TFE731-3AR and 1 more. Effective Jul 21, 1989
- [AD 86-03-01](https://openairdocs.org/ad/86-03-01): Turbine Interstage Transition Ducts · Honeywell International TFE731-2, TFE731-3, TFE731-3A and 4 more. Effective Feb 24, 1986
- [AD 82-23-03 R1](https://openairdocs.org/ad/82-23-03-R1): High Pressure Compressor Impellers · Honeywell International TFE731-2, TFE731-2A, TFE731-2B and 12 more. Effective Dec 9, 1983
- [AD 81-24-08](https://openairdocs.org/ad/81-24-08): Turbine Interstage Transition Ducts · Honeywell International TFE731-2, TFE731-3, TFE731-3A and 2 more. Effective Jan 6, 1982
- [AD 80-16-04](https://openairdocs.org/ad/80-16-04): Tie Rod · Honeywell International TFE731-2, TFE731-3 and TFE731-3R. Effective Aug 7, 1980
- [AD 78-22-10](https://openairdocs.org/ad/78-22-10): Low Pressure Rotor Thrust Ball Bearings · Honeywell International TFE731-2, TFE731-3 and TFE731-3R. Effective Nov 13, 1978
- [AD 75-07-10](https://openairdocs.org/ad/75-07-10): Transfer Gearbox Vertical Bevel Gear Bearing · Honeywell International TFE731-2, TFE731-2A, TFE731-2B and 12 more. Effective May 1, 1975
- [AD 74-23-05](https://openairdocs.org/ad/74-23-05): Fuel Pumps · Honeywell International TFE731-2. Effective Nov 14, 1974
- [AD 74-11-06](https://openairdocs.org/ad/74-11-06): Fuel Control Computer · Honeywell International TFE731-2. Effective Sep 23, 1974
- [AD 74-18-16](https://openairdocs.org/ad/74-18-16): Fuel Control Computer · Honeywell International TFE731-2. Effective Sep 6, 1974
- [AD 74-18-12](https://openairdocs.org/ad/74-18-12): Fuel Control Orifice Assembly · Honeywell International TFE731-2. Effective Sep 3, 1974
- [AD 74-13-09](https://openairdocs.org/ad/74-13-09): Fuel Pump Assemblies · Honeywell International TFE731-2. Effective Jul 31, 1974
- [AD 89-22-16](https://openairdocs.org/ad/89-22-16): Engine Acceleration or Deceleration · Honeywell International TFE731-2, TFE731-5, TFE731-5AR and 1 more

### Historical (superseded or no longer in force)

- [AD 2012-26-15](https://openairdocs.org/ad/2012-26-15) (historical): Navigation · Agusta AW139, A318-111, A318-112 and 71 more. Effective Jan 24, 2013
- [AD 2009-11-13](https://openairdocs.org/ad/2009-11-13) (historical): Hydraulic power · Learjet 45. Effective Jun 17, 2009
- [AD 2006-22-05](https://openairdocs.org/ad/2006-22-05) (historical): Integrated navigation units (INUs) · 328 Support Services 328-100, 328-300, Jetstream Model 4101 and 27 more. Effective Dec 1, 2006
- [AD 2000-22-04](https://openairdocs.org/ad/2000-22-04) (historical): Nose Landing Gear · Learjet 45. Effective Dec 6, 2000
- [AD 2017-20-01](https://openairdocs.org/ad/2017-20-01) (historical): Turbine Engine Compressor Section · Honeywell International TFE731-20 and TFE731-40. Effective Nov 2, 2017
- [AD 98-17-01](https://openairdocs.org/ad/98-17-01) (historical): Honeywell International TFE731-2, TFE731-2A, TFE731-2B and 14 more. Effective Oct 13, 1998
- [AD 96-18-13](https://openairdocs.org/ad/96-18-13) (historical): Fan rotor disk · Honeywell International TFE731-2, TFE731-2A, TFE731-3 and 10 more. Effective Nov 12, 1996
- [AD 86-11-05](https://openairdocs.org/ad/86-11-05) (historical): Fan Rotor Discs · Honeywell International TFE731-2, TFE731-3 and TFE731-3R

## Information bulletins (advisory) (2 in force)

- [SAIB AIR-21-15R1](https://openairdocs.org/saib/AIR-21-15R1): Navigation System. Issued Sep 16, 2021
- [SAIB NE-06-70](https://openairdocs.org/saib/NE-06-70): . Issued Sep 25, 2006
- [SAIB AIR-21-15](https://openairdocs.org/saib/AIR-21-15) (historical): Navigation System. Issued Aug 26, 2021

## NTSB investigations

None matched to N254FS.

## FAA accident and incident reports

None matched to N254FS.

## Service difficulty reports

None filed for this aircraft. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.

## STCs that may be installed (OpenAirDocs) (159, first 50)

Approved for this aircraft's airframe or engine model, in force first, then newest. The registry doesn't record which STCs an aircraft has; its records do.

### Approved for the airframe (Learjet 45)

- [STC ST12518IB](https://openairdocs.org/stc/ST12518IB): Flight Data Recorder (FDR) Installation Structural Provisions. Sky Service F.B.O. Inc
- [STC ST00885LA](https://openairdocs.org/stc/ST00885LA): Installation of fire extinguisher cartridges as replacements for Pacific Scientific fire extinguisher cartridges in fire extinguisher bottles. AMETEK AMERON, LLC d/b/a MASS Systems
- [STC SA2622NM](https://openairdocs.org/stc/SA2622NM): Installation of Precise Flight Pulselite Control Unit in landing/taxi system. (767-200 B17) (DHC-8 101). Precise Flight Inc
- [STC ST04760NY](https://openairdocs.org/stc/ST04760NY): Installation of LAI Windshields. Lee Aerospace
- [STC ST00892LA](https://openairdocs.org/stc/ST00892LA): Installation of Emergency Vision Assurance System (EVAS). VisionSafe LLC
- [STC ST12153AC](https://openairdocs.org/stc/ST12153AC): Installation of the Honeywell RFF-100 5G Bandpass Filter on certain Honeywell AA-300 and KRA 405B equipped aircraft. TES Parts LLC
- [STC ST03885AT](https://openairdocs.org/stc/ST03885AT): Installation of an Avionica, Inc. avCM Cellular Module. Aircraft Systems and Manufacturing Inc
- [STC ST12087CH](https://openairdocs.org/stc/ST12087CH): Installation replacement Cabin/Cockpit Handheld Fire Extinguishers. Avcon Industries Inc
- [STC ST01119DE](https://openairdocs.org/stc/ST01119DE): Installation of a Gogo Galileo Half-Duplex (HDX) System. Peregrine
- [STC ST12142IB](https://openairdocs.org/stc/ST12142IB): Installation of of the Honeywell RDR 7000 Weather Radar System. Maga Aviation Manutenção de Aeronaves LTDA
- [STC ST03292CH](https://openairdocs.org/stc/ST03292CH): Activation of an 802.11 a/b/g/n WiFi System. Elliott Aviation Technical Products Development, Inc
- [STC ST02472AT](https://openairdocs.org/stc/ST02472AT): Installation of a mini Quick Access Recorder (QAR) model MKI, MKII, or MKIII. Aircraft Systems and Manufacturing Inc
- [STC ST01117DE](https://openairdocs.org/stc/ST01117DE): Installation of the Gogo ATG C1. Peregrine
- [STC ST01936WI](https://openairdocs.org/stc/ST01936WI): Installation of LED lights. AeroLED's Holdings LLC
- [STC ST04159CH](https://openairdocs.org/stc/ST04159CH): Upgrade of Honeywell Primus II Communications Units RCZ-8XX Transponders to support Certification of Automatic Dependent Surveillance -Broadcast (ADS-B) Out. CMD Flight Solutions LLC
- [STC ST03424CH](https://openairdocs.org/stc/ST03424CH): Certification of Automatic Dependent Surveillance - Broadcast (ADS-B) Out System with Rockwell Collins TDR-94/-94D Transponders. CMD Flight Solutions LLC
- [STC ST01639WI](https://openairdocs.org/stc/ST01639WI): Removal of the Concorde RG-443 Emergency Battery and replacement with the Concorde RG-145-2 Emergency Battery. Global Aviation Tech LLC
- [STC ST01726WI](https://openairdocs.org/stc/ST01726WI): Installation of a Tailcone Cooling Axial Fan and Ducting. Global Aviation Tech LLC
- [STC ST04575AT](https://openairdocs.org/stc/ST04575AT): Installation of the Rockwell Collins ALT-1000+/ -4000+ with 5G Filtering. Chippewa Aerospace Inc
- [STC ST01651CH](https://openairdocs.org/stc/ST01651CH): Install air ambulance conversion. Spectrum Aeromed LLC dba Spectrum Aeromed
- [STC ST01070DE](https://openairdocs.org/stc/ST01070DE): Installation of the Curtiss-Wright Fortress Flight Data Recorder (with Cockpit Voice Recorder). Peregrine
- [STC ST00098IB](https://openairdocs.org/stc/ST00098IB): Introduction of ADS-B Out. STC Twenty One Limited
- [STC ST01976WI](https://openairdocs.org/stc/ST01976WI): Add Honeywell Synthetic Vision Capability to the DU-875 Display Units, Primus Elite Advanced Features (PEAF). TurboJet Engineering Pty Ltd
- [STC ST04522CH](https://openairdocs.org/stc/ST04522CH): INSTALL UNIVERSAL AVIONICS SYSTEMS CORP (UASC) FMS SOFTWARE VERSION 1002.X INTO EXISTING UASC FMS's. FLIGHTSTAR CORPORATION
- [STC ST01704WI](https://openairdocs.org/stc/ST01704WI): Installation of Crane Aerospace & Electronics SmartStem Wireless Tire Pressure Sensing System. ELDEC Corporation
- [STC ST04177AT](https://openairdocs.org/stc/ST04177AT): Installation of a Talon Aerospace LED Replacement General Purpose Lamps. Aaxico Technical Services Inc
- [STC ST04479CH](https://openairdocs.org/stc/ST04479CH): INSTALL GOGO AVANCE L5 SYSTEM PROVISIONS. FLIGHTSTAR CORPORATION
- [STC ST01270WI-D](https://openairdocs.org/stc/ST01270WI-D): Installation of Honeywell MK V and MK VII EGPWS Runway Awareness and Advisory System (RAAS). This approval is limited to specifically idenitfied aircraft. Duncan Aviation Inc
- [STC ST02635LA](https://openairdocs.org/stc/ST02635LA): Modification to replace the existing Mode S Transponder system with the ACSS NXT-600 Mode S Transponder with ADS-B Out. Aviation Communication and Surveillance Systems (ACSS) LLC
- [STC SA01452CH](https://openairdocs.org/stc/SA01452CH): Installation of an air ambulance conversion kit. Med-Pac Inc
- [STC ST04439CH](https://openairdocs.org/stc/ST04439CH): The certification for Transmitting Portable Electronic Device (TPED) on Learjet Inc. Model 45 aircraft in accordance with Flightstar Corporation Master Data List 45-001-028, Revision C, dated November 21, 2019, or later FAA approved revision. Flightstar Corporation
- [STC ST01927WI](https://openairdocs.org/stc/ST01927WI): Installation of Mid-Continent MD-302 Standby Attitude Module. Jet City Engineering Pty Ltd
- [STC ST04421CH](https://openairdocs.org/stc/ST04421CH): Installation of a Data link communication system supporting FANS 1/A+ capability. Flightstar Corporation
- [STC ST00934DE](https://openairdocs.org/stc/ST00934DE): Installation of Becker Avionics BXT6553 transponder. Peregrine
- [STC ST01558WI](https://openairdocs.org/stc/ST01558WI): Installation of a Nav Light Switch Modification for Flight Deck Annunciator Dimming. Diamond W. Inc
- [STC ST00909SE](https://openairdocs.org/stc/ST00909SE): Installation of emergency medical stretchers and bases, oxygen and electrical systems. LifePort LLC
- [STC ST10526SC](https://openairdocs.org/stc/ST10526SC): Replacement of Thrust Reverser Control Units. The NORDAM Group LLC
- [STC ST04298NY](https://openairdocs.org/stc/ST04298NY): Installation of the Universal Avionics System Corporation (UASC) UL-801 UNILINK Airborne Data Link. Sky Service F.B.O. Inc
- [STC ST00942DE](https://openairdocs.org/stc/ST00942DE): Demonstration of Aircraft Compatibility to Wireless Fidelity (WiFi) Data Transmissions (Ground & Flight). West Star Aviation, LLC
- [STC ST00790DE](https://openairdocs.org/stc/ST00790DE): Installation of BendixKing CAS 67B Traffic Alert and Collision Avoidance System (TCAS) II Version 7.1. Peregrine
- [STC ST02636LA](https://openairdocs.org/stc/ST02636LA): Modification to upgrade the existing XS-950 Mode S Transponder system to add ADS-B Out. Aviation Communication and Surveillance Systems (ACSS) LLC
- [STC ST00347BO](https://openairdocs.org/stc/ST00347BO): Modification to upgrade a BendixKing CAS 67A TCAS II system to CAS 67B TCAS II Change 7.1. Pro Star Aviation, LLC
- [STC ST00361BO](https://openairdocs.org/stc/ST00361BO): Installation of a Honeywell Primus II (XS-852) ADS-B Out System. Pro Star Aviation, LLC
- [STC ST00373BO](https://openairdocs.org/stc/ST00373BO): Installation of Rockwell Collins TDR-94D Transponders with ADS-B Out. Pro Star Aviation, LLC
- [STC ST01878WI](https://openairdocs.org/stc/ST01878WI): Installation of replacement components for the cabin management/in-flight entertainment systems on the Learjet Model 45 aircraft (Learjet 70/75 configurations). Learjet Inc
- [STC ST11071SC](https://openairdocs.org/stc/ST11071SC): Demonstration of aircraft critical equipment and antenna systems tolerance of radio frequency interference (RFI) from intentional or spurious transmissions from certain Portable Electronic Devices (PEDs). Liberty Partners Inc
- [STC ST01842WI](https://openairdocs.org/stc/ST01842WI): Installation of Honeywell DU-875 Primus Elite cockpit display units. Learjet Inc
- [STC ST04194CH](https://openairdocs.org/stc/ST04194CH): Install Honeywell Liquid Crystal Display (LCD) Flight Displays. Pentastar Aviation LLC
- [STC ST04030CH](https://openairdocs.org/stc/ST04030CH): Installation of Aircell ATG-2000/4000/5000 High Speed Internet with Wireless Local Area Network (WLAN). Nextant Aerospace
- [STC ST03873NY](https://openairdocs.org/stc/ST03873NY): Installation of Honeywell DU-875 MFD. Aviation Traders Limited (Trading as ATL)

All 159: https://openairdocs.org/aircraft/N254FS/stcs.md

## Related

- Other Learjet 45 aircraft: https://openairdocs.org/model/learjet-45/aircraft.md
- The Honeywell TFE-731-SER series engine: https://openairdocs.org/engine/honeywell-tfe-731-ser-series.md

---
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