LEARJET INC 55

4 registered · 1981–1983 · 1 NTSB events · 46 ADs

About this data

Fixed Wing Multi Engine · GARRETT TFE731 SERIES · as of Sep 21, 2026

Distribution · currently registered

By state (top 10)

TX 25.0% 1
FL 25.0% 1
CO 25.0% 1
DE 25.0% 1

By decade of manufacture

1980s 75.0% 3
Unknown 25.0% 1

NTSB records

1 event(s) on file. Showing the most recent 1.

Jan 11, 2024 N558RA Livingston, Montana Minor NTSB docket ↗

Research papers

NASA NTRS 2013 · Conference Paper Cockpit Resource Management (CRM) training in the 1550th combat crew training wing The training program the 1550th Combat Crew Training Wing at Kirtland Air Force Base, New Mexico, implemented in September 1985 is discussed.
NASA NTRS 2025 · Conference Paper Reduction of Aircraft Noise Uncertainty for a Notional Supersonic Business Jet NASA supported a study by the International Civil Aviation Organization on the environmental impact of adding supersonic aircraft to the existing global fleet by designing a notional 55-tonne superson…
Semantic Scholar 2024 · Article (BMC Medical Education) Augmented reality visualization for ultrasound-guided interventions: a pilot randomized crossover trial to assess trainee performance and cognitive load Augmented reality (AR) technology involving head-mounted displays (HMD) represents a significant innovation in medical education, particularly for training in guided invasive procedures.
Embry-Riddle Scholarly Commons 2024 · Journal article (JAAER) Assessing Past Airworthiness Directives And How Safety Management Systems May Benefit Aviation Product Design And Manufacturing The European Union Aviation Safety Agency (EASA) continues to promulgate Safety Management Systems (SMS) across aviation organizations when it recently issued SMS requirements for EASA certificated Pa…
arXiv 2023 · arXiv preprint Detection and Mitigation of Position Spoofing Attacks on Cooperative UAV Swarm Formations Detecting spoofing attacks on the positions of unmanned aerial vehicles (UAVs) within a swarm is challenging. Traditional methods relying solely on individually reported positions and pairwise distanc…
Semantic Scholar 2023 · Article (Frontiers in Medicine) Markers of oxidative stress during post-COVID-19 fatigue: a hypothesis-generating, exploratory pilot study on hospital employees Introduction Post-COVID-19 fatigue is common after recovery from COVID-19. Excess formation of reactive oxygen species (ROS) leading to oxidative stress-related mitochondrial dysfunction is referred t…

All research papers

Airworthiness directives

46 directive(s) on file. Showing the most recent 25 · 21 more in the Federal Register.

Feb 22, 2022

Airworthiness Directives; Learjet, Inc., Airplanes

The FAA is adopting a new airworthiness directive (AD) for certain Learjet, Inc., Model 35, 35A (C-21A), 36, 36A, 55, 55B, 55C, and 60 airplanes. This AD was prompted by a report indicating that a repair station approved Learjet spoiler assemblies for return to service after extending their life limit. This AD require…

Atlas AD Federal Register ↗
Sep 18, 2018

Airworthiness Directives; Learjet, Inc. Airplanes

We are adopting a new airworthiness directive (AD) for certain Learjet, Inc. Models 28, 29, 31, 31A, 35, 35A, 36, 36A, 55, 55B, 55C, and 60 airplanes. This AD was prompted by fatigue cracks initiating in the flap support structure due to repetitive flap loads, which has caused flap nose roller support bracket failure.…

Atlas AD Federal Register ↗
May 8, 2018

Airworthiness Directives; Learjet, Inc. Airplanes

We propose to adopt a new airworthiness directive (AD) for certain Learjet, Inc. Models 28, 29, 31, 31A, 35, 35A, 36, 36A, 55, 55B, 55C, and 60 airplanes. This proposed AD was prompted by fatigue cracks initiating in the flap support structure due to repetitive flap loads, which has caused flap nose roller support bra…

Atlas AD Federal Register ↗
Jun 8, 2010

Airworthiness Directives; Learjet Inc. Model 60 Airplanes

We are adopting a new airworthiness directive (AD) for certain

Atlas AD Federal Register ↗
Mar 17, 2010

Airworthiness Directives; Honeywell International Inc. TFE731 Series Turbofan Engines

The FAA is adopting a new airworthiness directive (AD) for Honeywell International Inc. TFE731 series turbofan engines with certain second stage low-pressure compressor rotor (LPCR) discs and/or certain third stage LPCR discs installed. This AD requires removing from service certain second stage LPCR discs and/or cert…

Atlas AD Federal Register ↗
Dec 11, 2009

Airworthiness Directives; Honeywell International Inc. TFE731 Series Turbofan Engines

This supplemental NPRM revises an earlier proposed airworthiness directive (AD), for Honeywell International Inc. TFE731 series turbofan engines with certain second stage low-pressure compressor rotor (LPCR) discs and/or certain third stage LPCR discs installed. That proposed AD would have required removing from servi…

Atlas AD Federal Register ↗
Apr 13, 2009

Airworthiness Directives; Honeywell International Inc. TFE731 Series Turbofan Engines

The FAA proposes to adopt a new airworthiness directive (AD) for Honeywell International Inc. TFE731 series turbofan engines with certain second and third stage low-pressure compressor rotor (LPCR) discs installed. This proposed AD would require removing from service, certain second and third stage LPCR discs, part nu…

Atlas AD Federal Register ↗
Feb 18, 2009

Airworthiness Directives; Learjet Model 55, 55B, and 55C Airplanes

We are adopting a new airworthiness directive (AD) for certain Learjet Model 55, 55B, and 55C airplanes. This AD requires inspecting the installation of the forward light assembly in the aft lavatory to determine the location of the terminal connector; inspecting for damage of the light assembly terminals, wires, and…

Atlas AD Federal Register ↗
Jun 13, 2008

Airworthiness Directives; Sandel Avionics Incorporated Model ST3400 Terrain Awareness Warning System/Radio Magnetic Indicator (TAWS/RMI) Units Approved Under Technical Standard Order(s) C113, C151a, or C151b; Installed on Various Small and Transport Category Airplanes

The FAA is revising an existing airworthiness directive (AD) that applies to Sandel Avionics Incorporated Model ST3400 TAWS/RMI units as described above. The existing AD currently requires installing a warning placard on the TAWS/RMI and revising the Limitations section of the airplane flight manual (AFM). The existin…

Atlas AD Federal Register ↗
Mar 13, 2008

Airworthiness Directives; Sandel Avionics Incorporated Model ST3400 Terrain Awareness Warning System/Radio Magnetic Indicator (TAWS/RMI) Units Approved Under Technical Standard Order(s) C113, C151a, or C151b; Installed on Various Small and Transport Category Airplanes

The FAA proposes to revise an existing airworthiness directive (AD) that applies to Sandel Avionics Incorporated Model ST3400 TAWS/RMI units as described above. The existing AD currently requires installing a warning placard on the TAWS/RMI and revising the Limitations section of the airplane flight manual (AFM). The…

Atlas AD Federal Register ↗
Jan 31, 2008

Airworthiness Directives; Honeywell International Inc. TFE731-2C, -3B, -3BR, -3C, -3CR, -3D, -3DR, -4R, -5AR, -5BR, -5R, -20R, -20AR, -20BR, -40, -40AR, -40R, and -60 Series Turbofan Engines

The FAA is adopting a new airworthiness directive (AD) for Honeywell International Inc. (Honeywell) TFE731-2C, -3B, -3BR, -3C, - 3CR, -3D, -3DR, -4R, -5AR, -5BR, -5R, -20R, -20AR, -20BR, -40, -40AR, - 40R, and -60 series turbofan engines. This AD requires removal from service of certain high pressure (HP) turbine roto…

Atlas AD Federal Register ↗
Sep 4, 2007

Airworthiness Directives; Honeywell International Inc. TFE731-2C, -3B, -3BR, -3C, -3CR, -3D, -3DR, -4R, -5AR, -5BR, -5R, -20R, -20AR, -20BR, -40, -40AR, -40R, and -60 Series Turbofan Engines

The FAA proposes to adopt a new airworthiness directive (AD) for Honeywell International Inc. (Honeywell) TFE731-2C, -3B, -3BR, -3C, -3CR, -3D, -3DR, -4R, -5AR, -5BR, -5R, -20R, -20AR, -20BR, -40, -40AR, -40R, and -60 series turbofan engines. This proposed AD would require removal from service of certain high pressure…

Atlas AD Federal Register ↗
Aug 28, 2007

Airworthiness Directives; Learjet Model 31, 31A, 35, 35A (C-21A), 36, 36A, 55, 55B, and 55C Airplanes, and Model 45 Airplanes

The FAA is adopting a new airworthiness directive (AD) for certain Learjet Model 31, 31A, 35, 35A (C-21A), 36, 36A, 55, 55B, and 55C airplanes, and Model 45 airplanes. This AD requires inspecting for unsealed gaps on the pylon side of the engine firewall and cleaning/ sealing any unsealed gap; and, for certain airplan…

Atlas AD Federal Register ↗
Apr 26, 2007

Airworthiness Directives; Learjet Model 31, 31A, 35, 35A (C-21A), 36, 36A, 55, 55B, and 55C Airplanes, and Model 45 Airplanes

The FAA proposes to adopt a new airworthiness directive (AD) for certain Learjet Model 31, 31A, 35, 35A (C-21A), 36, 36A, 55, 55B, and 55C airplanes, and Model 45 airplanes. This proposed AD would require inspecting for unsealed gaps on the pylon side of the engine firewall and cleaning/sealing any unsealed gap; and,…

Atlas AD Federal Register ↗
Feb 16, 2007

Airworthiness Directives; Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 31, 31A, 35, 35A (C-21A), 36, 36A, 55, 55B, and 55C Airplanes

The FAA is adopting a new airworthiness directive (AD) for certain Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 31, 31A, 35, 35A (C- 21A), 36, 36A, 55, 55B, and 55C airplanes. This AD requires modifying the left- and right-hand standby fuel pump switches…

Atlas AD Federal Register ↗
Aug 21, 2006

Airworthiness Directives; Sandel Avionics Incorporated Model ST3400 Terrain Awareness Warning System/Radio Magnetic Indicator (TAWS/RMI) Units Approved Under Technical Standard Order(s) C113, C151a, or C151b; Installed on Various Small and Transport Category Airplanes

The FAA is adopting a new airworthiness directive (AD). The new AD is for Sandel Avionics Incorporated Model ST3400 TAWS/RMI units as described above. This AD requires installing a warning placard on the TAWS/RMI and revising the Limitations section of the airplane flight manual (AFM). This AD also requires installing…

Atlas AD Federal Register ↗
Aug 16, 2006

Airworthiness Directives; Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 31, 31A, 35, 35A (C-21A), 36, 36A, 55, 55B, and 55C Airplanes

The FAA proposes to adopt a new airworthiness directive (AD) for certain Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 31, 31A, 35, 35A (C-21A), 36, 36A, 55, 55B, and 55C airplanes. This proposed AD would require modifying the left- and right-hand standby…

Atlas AD Federal Register ↗
Jun 22, 2005

Airworthiness Directives; Honeywell International Inc. (Formerly AlliedSignal Inc. and Garrett Turbine Engine Co.) TFE731-2 and -3 Series Turbofan Engines

The FAA is adopting a new airworthiness directive (AD) for Honeywell International Inc. (formerly AlliedSignal Inc. and Garrett Turbine Engine Co.) TFE731-2 and -3 series turbofan engines with certain part numbers (P/Ns) and serial numbers (SNs) of low pressure (LP) 1st and 2nd stage turbine rotor discs initially inst…

Atlas AD Federal Register ↗
Mar 14, 2005

Airworthiness Directives; Honeywell International Inc. TFE731-2 and -3 Series Turbofan Engines

The FAA is adopting a new airworthiness directive (AD) for Honeywell International Inc. (formerly AlliedSignal Inc. and Garrett Turbine Engine Co.) TFE731-2 and -3 series turbofan engines with certain part number (P/N) low pressure turbine (LPT) stage 1 disks installed. This AD requires for TFE731-2 and -2C series eng…

Atlas AD Federal Register ↗
Jan 19, 2005

Airworthiness Directives; GARMIN International Inc. GTX 33, GTX 33D, GTX 330, and GTX 330D Mode S Transponders

The FAA is adopting a new airworthiness directive (AD) to supersede Airworthiness Directive 2004-10-15, which applies to certain GTX 330 and GTX 330D Mode S transponders that are installed on airplanes. AD 2004-10-15 currently requires you to install GTX 330/330D Software Upgrade Version 3.03, 3.04, or 3.05. This AD a…

Atlas AD Federal Register ↗
Oct 7, 2004

Airworthiness Directives; GARMIN International Inc. GTX 33, GTX 33D, GTX 330, and GTX 330D Mode S Transponders

The FAA proposes to supersede Airworthiness Directive (AD) 2004-10-15, which applies to certain GTX 330 and GTX 330D Mode S transponders that are installed on airplanes. AD 2004-10-15 currently requires you to install GTX 330/330D Software Upgrade Version 3.03, 3.04, or 3.05. This proposed AD applies to certain GTX 33…

Atlas AD Federal Register ↗
Jul 1, 2004

Airworthiness Directives; Honeywell International Inc. (Formerly AlliedSignal Inc. and Garrett Turbine Engine Co.). TFE731-2 and -3 Series Turbofan Engines

The FAA proposes to adopt a new airworthiness directive (AD) for Honeywell International Inc. (formerly AlliedSignal Inc. and Garrett Turbine Engine Co.) TFE731-2 and -3 series turbofan engines with certain part numbers (P/Ns) and serial numbers (SNs) of low pressure (LP) 1st and 2nd stage turbine rotor discs initiall…

Atlas AD Federal Register ↗
Jun 16, 2004

Airworthiness Directives; Honeywell International Inc. TFE731-2 and -3 Series Turbofan Engines

The FAA proposes to adopt a new airworthiness directive (AD) for Honeywell International Inc. (formerly AlliedSignal Inc. and Garrett Turbine Engine Co.) TFE731-2 and -3 series turbofan engines with certain part number (P/N) low pressure turbine (LPT) stage 1 disks installed. This proposed AD would require for TFE731-…

Atlas AD Federal Register ↗
May 21, 2004

Airworthiness Directives; GARMIN International Inc. GTX 330 Mode S Transponders and GTX 330D Diversity Mode S Transponders

The FAA adopts a new airworthiness directive (AD) for certain GARMIN International Inc. GTX 330/GTX 330D Mode S transponders that are installed on aircraft. This AD requires you to install GTX 330/330D Software Upgrade Version 3.03, 3.04, or 3.05. This AD is the result of observations that the GTX 330 and GTX 330D may…

Atlas AD Federal Register ↗
Dec 30, 2003

Airworthiness Directives; GARMIN International Inc. GTX 330 Mode S Transponders and GTX 330D Diversity Mode S Transponders

The FAA proposes to adopt a new airworthiness directive (AD) for certain GARMIN International Inc. GTX 330/GTX 330D Mode S transponders. This proposed AD would require you to install GTX 330/ 330D Software Upgrade Version 3.03. This proposed AD is the result of observations that the GTX 330 and GTX 330D may detect, fr…

Atlas AD Federal Register ↗

Type certificate data sheets · 1 match in the FAA catalog

A10CE Learjet Inc. Historical Rev 64 · 12/28/2010
Models: 25B, 24F-A, 36A, 24A + 25 more

Atlas TCDS DRS ↗

Supplemental type certificates · 213 on file

+ 183 more STCs on file

PMA replacement parts · 60+ on file

+ 20 more PMA parts on file

Advisory circulars & Federal Register

Advisory circulars

No ACs explicitly mention this type. Showing universal operating-rule ACs that apply to all aircraft.

Recent Federal Register · Parts 91 & 43

Registered N-numbers · 4

4 of 4 ● NTSB events on file · orange tails have Atlas pages · Look up queries the live FAA registry (owner, address, last airworthiness)

N-number	St	Year	Status	NTSB	FAA
N54NW	TX	1982	Active	·	Look up ↗
N550TC	FL	—	Active	·	Look up ↗
N558RA	CO	1983	Active	●	Look up ↗
N976DG	DE	1981	Active	·	Look up ↗

Source — FAA Aircraft Registry

Sources

FAA Aircraft Registry ↗ Refreshed Apr 27, 2026 Available
NTSB CAROL ↗ Refreshed Jun 10, 2026 Available
Federal Register (FAA Airworthiness Directives) ↗ Refreshed Apr 27, 2026 Available