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Technify Motors GmbH is an aircraft Diesel engine manufacturer based in Sankt Egidien, Germany. In July 2013, Chinese state-owned Aviation Industry Corporation of China (AVIC) acquired the aircraft Diesel engine designs and manufacturing assets of the former Thielert Aircraft Engines GmbH and added them to the Continental Motors Group as Technify Motors GmbH.[1][2] The 5,000th engine was delivered in April 2017 after 15 years of production, accumulating more than 5.25 million flying hours and equipping over 2,750 aircraft.[3]

Key Information

History

[edit]

Thielert AG was a German financial holding company that has owned engine development and manufacturing companies. It was headquartered in Hamburg. Companies owned were Thielert Aircraft Engines GmbH with sites in Lichtenstein, Saxony and Altenburg, Thuringia. Thielert AG was quoted on the Frankfurt Stock Exchange and was a member of the SDAX.

Founded in 1989, turnover increased from €3.3 million in 1997 to €16.2 million in 2002, while employees grew from 27 to 112; Thielert Aircraft Engines was founded in 1999 to adapt Diesel engine for general aviation, entered Centurion 1.7 serial production in 2002 and had 86 employees in 2003.[4]

The main operating unit, Thielert Aircraft Engines GmbH, declared insolvency on 24 April 2008 and was then run by an insolvency administrator, Bruno M. Kübler.[5] The holding company, Thielert AG, also filed insolvency a week later on 30 April 2008 after the loss of its operational unit, Thielert Aircraft Engines GmbH. The holding company ceased operations in autumn of 2008.[6] It was sold in July 2013 to Continental Motors, a subsidiary of Aviation Industry Corporation of China (AVIC).[7]

Insolvency

[edit]

On 6 March 2008 Thielert's financial statements for 2003, 2004 and 2005 were nullified by a Hamburg court, on the basis that the company had breached valuation provisions. As a result of these events the company's stock dropped to a record low of €0.36 from previous highs of €25.22 on the German stock market.[8][9]

On 23 April 2008 it was announced that the company Board of Directors had dismissed "with cause" company founder Frank Thielert and also cancelled his employment contract, due to evidence found during a criminal investigation by the Hamburg Office of Criminal Investigation. The allegations included that false invoices had been written, which were used to boost accounts receivable and create the appearance of a better financial position for the company. The board also dismissed Chief Financial Officer Roswitha Grosser and sold off €24.4 million to cover immediate financial requirements.[10][11][12]

In April 2008 a stockholder restructuring plan was put on hold and as a result on 24 April 2008 Thielert Aircraft Engines GmbH, responsible for all engine production, filed for insolvency at the Chemnitz County Court. As the situation deepened, the Thierlert board stated on 26 April 2008: "The going concern of Thielert Aircraft Engines GmbH can only be ensured permanently by restructuring activities with the support of investors, due to the fact that the Holding Thielert AG is not capable to do so anymore." The company announced that it would name a new executive board and an interim insolvency trustee.[6][12][13][14][15][16]

In April 2008 Cessna suspended plans to sell a Diesel-equipped Cessna 172TD as a result of the insolvency.[17]

On 1 May 2008 the board appointed a new CEO, lawyer Marcel Kleib and lawyer Achim Ahrendt of Hamburg was appointed to oversee the insolvency proceedings.[17] On 5 May 2008 bankruptcy administrator attorney Bruno M. Kubler issued a letter to company customers indicating that the business would continue to operate producing engines and parts, meet existing orders, to preserve its capability to reorganize. On 14 May 2008 Thielert announced that it would no longer honor existing engine warranties for engines installed in Diamond Aircraft and also dramatically increased the price of parts. Owners who required warranty work were required to pay cash in advance for parts. This announcement caused an immediate negative reaction from Diamond DA42 owners and also from Diamond Aircraft.[18][19]

On 18 June 2008 the company announced that it was resuming production of all its Diesel engine products, with a production target of 80 units per month. Thielert guaranteed the new engines against defective materials and labor, but parts prices remained at the previously announced high levels.[20][21]

On 10 July 2008 Diamond Aircraft announced that it was dropping out of the bidding to purchase Thielert, citing that Thielert withheld key information "vital to the due diligence process", although Thielert disagreed. On Friday 11 July 2008, Thielert issued a press release stating: "the reasons Diamond is presenting for its non-participation are clearly pretext". Thielert implied that Diamond was not a serious prospective buyer and that "Diamond's actions clearly serve the purpose of derogating Thielert's reputation in the naive assumption to be able to subsequently purchase Thielert far under value."[22]

As part of its insolvency, Thielert indicated that it would not honor warranties or inspect and replace life-limited parts as was the case when the engines were sold to customers. This change in policy has resulted in Thielert-powered aircraft being grounded or no longer economically viable to fly. In November 2008 Diamond Aircraft CEO Peter Maurer said the insolvency commissioner responsible for Thielert's restructuring has come to understand that the eventual sale of the company will depend on product support. This led to Thielert reducing the cost of parts and actively working on extending inspection and replacement requirements for gearbox clutches as well as other parts.[23][24]

In January 2009, Bruno M. Kübler, Thielert's insolvency administrator announced that the company was, "in the black and working to capacity". On 6 April 2009 the company announced that insolvency administrator had "transferred the company's operative new business to a company that is unaffected by the insolvency proceedings". The new company, Centurion Engines, is responsible for worldwide sales of Centurion Diesel engines and spare parts.[25][26]

At the end of November 2010 the company was making a profit and actively seeking new investors. Kübler indicated that major lending institutions have loosened credit enough that investment is more likely than it was in 2008 or 2009.[5]

In 2016 Thielert was sentenced to four years in prison for fraud in misrepresenting the value and financial position of the company during attempts to find buyers and investors.[27] In 2017 the Federal Court of Justice overturned the ruling of the Hamburg Regional Court in 2016 and referred the court back to it.[28]

On 23 July 2013 the company was sold to Continental Motors, Inc. Continental is owned by AVIC International, which is, in turn, wholly owned by the Government of the People's Republic of China. Thielert was renamed Technify Motors GmbH. Continental uses Chinese investment to continue development of the company's products, with an emphasis on extending gearbox inspection periods initially.[7][29]

Products

[edit]
Thielert Centurion 1.7 installed in a Cessna 172
Thielert Centurion 1.7 Diamond DA42 installation.

Thielert Aircraft Engines GmbH was well known as the manufacturer of the Centurion range of aircraft Diesel engines that run on jet fuel. Two engine models were built, the Centurion 2.0 with a power output of 135 hp (101 kW), and the Centurion 2.0s with 155 hp (116 kW). The development of the third model, a 350 hp (261 kW) Centurion 4.0, was not completed. A fourth model, the 230 hp (172 kW) Centurion 3.2 was announced for 2008, but its final development was cancelled.

New built aircraft equipped with Thielert Centurion engines include:

Kits for the installation of retrofit Thielert engines exist for a number of aircraft, including the Piper PA-28 Cherokee and the Cessna 172 for the Centurion 2.0.[citation needed]

A Thielert Centurion 2.0 engine also powers an unmanned aerial vehicle, the General Atomics Warrior, an upgraded version of the General Atomics MQ-1 Predator.[citation needed]

A third field of activity is contract engine development and manufacture of engine parts for prototypes and small series for the automotive industry.

References

[edit]
[edit]
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Technify Motors

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Continental Aerospace Technologies GmbH, formerly known as Technify Motors GmbH, is a German manufacturer of aircraft diesel engines, specializing in certified Jet-A piston engines for general aviation aircraft. Headquartered in Sankt Egidien, Germany, the company traces its origins to 2013, when AVIC International, a subsidiary of the state-owned Aviation Industry Corporation of China (AVIC), acquired the assets of the insolvent Thielert Aircraft Engines GmbH and incorporated them under the Technify Motors name. In 2011, AVIC established its U.S. subsidiary Technify Motors (USA) Ltd. to acquire Continental Motors Inc., which was later rebranded as Continental Aerospace Technologies in 2019, integrating its gasoline and diesel engine production lines. This expanded the group's portfolio to include a full range of piston engines, with over 12 million flight hours logged on its Jet-A diesel models as of April 2025. Notable products include the TAE 125 series, such as the TAE 125-01 (Centurion 1.7, 125 hp) and TAE 125-02 (Centurion 2.0, 135 hp), which are four-cylinder, four-stroke diesel engines certified for installation in aircraft like the Diamond DA40 and DA42. In 2019, Technify Motors GmbH was renamed Continental Aerospace Technologies GmbH as part of a global rebranding under AVIC ownership. The company continues to focus on innovative, fuel-efficient propulsion systems, contributing to advancements in through ongoing certifications and production in and the . Its engines emphasize reliability, with type certificates held by the (EASA) and the (FAA), and are subject to regular airworthiness directives to ensure safety.

History

Origins as Thielert Aircraft Engines

Thielert Aircraft Engines GmbH (TAE) was established in 1999 by entrepreneur Frank Thielert in Lichtenstein, Germany, as a specialist in developing high-performance diesel engines for , building on his prior experience in since founding Thielert Motoren in 1989. The company aimed to adapt proven automotive diesel technology to meet the demands of , focusing on , reduced operating costs, and compatibility with Jet A fuel to address the limitations of traditional avgas-powered engines. From its inception, TAE concentrated on modifying automotive diesel s for aircraft certification and performance, culminating in the 1.7—a 135-horsepower, four-cylinder, turbocharged, liquid-cooled based on a 1.7-liter block— which entered production in 2002. This adaptation involved significant reengineering, including aviation-specific gearing, cooling systems, and electronic controls, to ensure reliability in flight while leveraging the inherent durability and efficiency of the automotive base. Significant milestones marked TAE's early progress: the first flight test of a diesel-powered aircraft equipped with a TAE engine occurred in September 2000 at Altenburg Airport in , , validating the technology's potential ahead of certification. The 1.7 achieved European Union Aviation Safety Agency (EASA) type certification on August 14, 2006, enabling broader adoption in certified aircraft. By 2008, production had expanded substantially, with over 3,500 engines delivered, reflecting rapid growth in manufacturing capacity at facilities in Lichtenstein and other German sites. TAE entered the market through strategic partnerships with leading aircraft manufacturers, most notably , which became the primary integrator of engines starting with the single-engine DA40 in 2002 and the twin-engine DA42 Twin Star in 2004, powering hundreds of units and demonstrating the engines' viability in production aircraft. These collaborations highlighted the 's advantages, such as 20-30% better fuel economy over comparable engines, and helped establish TAE as a pioneer in diesel during its formative years.

Insolvency proceedings

In April 2008, Thielert Aircraft Engines faced an acute triggered by an urgent liquidity shortage of €14 million, stemming from irregularities—including the nullification of from 2003 to 2005 by a court—and delays in customer payments for engine deliveries. These issues, compounded by heavy investments in production expansion, eroded the company's cash reserves despite prior certifications for its diesel engines. On April 24, 2008, Thielert Aircraft Engines GmbH filed for under German law (Insolvenzordnung), initiating proceedings to restructure its debts and operations. The court appointed Bruno M. Kübler as insolvency administrator to oversee the process, aiming to preserve the company's viability through creditor negotiations and an . Concurrently, the board dismissed founder and CEO Frank Thielert, along with Roswitha Grosser, amid allegations of mismanagement and financial irregularities uncovered in an internal investigation. The led to immediate operational disruptions, including a complete halt in engine production at the company's facilities in , , which severed supply chains for critical components and spare parts. owners, particularly those operating Diamond DA42 and models equipped with Thielert engines, experienced severe parts shortages, grounding fleets and increasing maintenance costs; , Thielert's largest , reduced production by 60% of its annual output as a result. In response to these supply uncertainties and related safety concerns, the FAA and EASA issued multiple emergency airworthiness directives in 2008, mandating inspections and modifications for Thielert TAE 125-series engines, such as clutch disc spring replacements to address potential failures exacerbated by the production stoppage. A court-approved insolvency plan, submitted shortly after the filing, enabled partial recovery by permitting limited operations to continue through 2009, with production resuming at reduced capacity under Kübler's administration to fulfill existing orders and stabilize supply. This restructuring preserved approximately 200 jobs and allowed the company to deliver engines at standard quality levels, though at a fraction of pre-crisis volumes, providing temporary relief to affected stakeholders.

Acquisition and rebranding

On July 23, 2013, (AVIC) International Holding Corporation acquired the assets of the insolvent Thielert Aircraft Engines GmbH through its newly formed subsidiary, Technify Motors GmbH. This purchase included the production facilities, intellectual property, and type certificates for Thielert's series diesel engines, such as the 1.7-liter TAE 125-01 and the 2.0-liter TAE 125-02-99/114 models, enabling continuity in engine development and certification under (EASA) oversight. Following the acquisition, Thielert Aircraft Engines was rebranded as Technify Motors GmbH, with operations integrated into AVIC's broader Continental Motors Group portfolio. The headquarters were relocated from Lichtenstein to nearby Sankt Egidien in , , at Platanenstraße 14, to streamline manufacturing and administrative functions while maintaining proximity to existing supply chains. This rebranding marked the end of Thielert's independent identity and aligned the company with AVIC's global aviation strategy. The immediate effects of the acquisition addressed critical challenges from Thielert's , including the transfer of type certificates that restored for engines and resolved persistent parts supply disruptions affecting operators. Technify Motors quickly renewed its Design Organization Approval (DOA), Production Organization Approval (POA), and Maintenance Organization Approval (MOA) from EASA, ensuring spare parts availability through Continental's international network and preventing further groundings of Thielert-powered . Post-acquisition, Technify continued production of the lineup, with model names updated in 2014 (e.g., 2.0 to CD-135). As of 2025, the company maintains EASA and FAA certifications, with ongoing airworthiness directives ensuring safety, and operates facilities in integrated with in the United States. Strategically, AVIC aimed to leverage Technify's technology to penetrate Western markets, combining it with Continental's engine expertise to offer comprehensive piston power solutions for . This move supported AVIC's goal of enhancing its presence in and by accelerating the adoption of fuel-efficient Jet-A s in .

Products and technology

Diesel engine lineup

Technify Motors' diesel engine lineup centers on the series, a family of compact, liquid-cooled, four-stroke engines optimized for aircraft and capable of operating on Jet-A or (). These engines emphasize high fuel efficiency, reduced operating costs, and compatibility with existing airframes through full-authority digital engine control () systems. The series evolved from automotive-derived designs, with key models including variants in the TAE 125 family and larger V6 configurations, all featuring turbocharging, common-rail direct injection, and double overhead camshafts for reliable performance in single- and twin-engine applications. The foundational models in the lineup are the TAE 125-02-99 (commercial designation CD-135 or Centurion 2.0) and its upgraded counterpart, the TAE 125-02-114 (CD-155). The TAE 125-02-99 is a 1.991-liter, inline four-cylinder delivering 99 kW (133 hp) at takeoff (5 minutes at 3,900 rpm) and 71 kW at maximum continuous cruise (3,400 rpm), certified under EASA CS-E for single- aircraft since August 14, 2006. The TAE 125-02-114 variant, certified in March 2007 with a power increase approved in January 2007, boosts output to 114 kW (153 hp) at takeoff while maintaining the same displacement and configuration, incorporating enhancements for improved reliability such as refined components to mitigate in-flight shutdown risks. Both models weigh approximately 145 kg dry and offer a time-between-overhaul (TBO) of up to 2,100 hours or 12 years, whichever comes first. A further variant, the TAE 125-02-125 (CD-170), is a 1.991-liter inline four-cylinder producing 125 kW (168 hp) at takeoff, certified under EASA.E.108 for enhanced performance in single-. Larger variants expand the lineup's applicability to higher-performance . The 3.0 (CD-300) is a 2.987-liter certified by EASA on June 20, 2017 (EASA.E.104), producing 221 kW (300 hp) at takeoff (5 minutes) with twin turbochargers and liquid cooling, and 200 kW (268 hp) maximum continuous, designed for multi-engine setups requiring greater power density. An even more powerful option, the 4.0, features an 8-cylinder, 3.996-liter configuration delivering up to 257 kW (345 hp), certified by EASA in 2007 (EASA.E.014) for demanding twin- and light-twin applications. These engines maintain the series' core attributes, including a of around 18:1 for . Post-acquisition enhancements under Continental Aerospace Technologies (which rebranded the operation as Technify Motors) included life extension programs for the TAE 125-02-99, extending the service life through rigorous data sampling and component upgrades, allowing operators to achieve the full 2,100-hour TBO with proper maintenance. As of April 2025, the Centurion series had accumulated over 12 million flight hours across thousands of aircraft, with production continuing into the 2020s. The engines provide 25-35% better fuel efficiency than comparable gasoline counterparts, attributed to higher compression and diesel cycle thermodynamics, reducing consumption to as low as 18-20 liters per hour in cruise for the 2.0-liter models.
ModelDisplacementCylindersPower Output (Takeoff)TBOCertification Date
TAE 125-02-99 (CD-135)1.991 LInline-499 kW (133 hp)2,100 hours / 12 yearsAug 14, 2006 (EASA)
TAE 125-02-114 (CD-155)1.991 LInline-4114 kW (153 hp)2,100 hours / 12 yearsMar 6, 2007 (EASA)
TAE 125-02-125 (CD-170)1.991 LInline-4125 kW (168 hp)2,100 hours / 12 years2010s (EASA)
Centurion 3.0 (CD-300)2.987 LV6221 kW (300 hp)2,000 hours / 12 yearsJun 20, 2017 (EASA)
Centurion 4.03.996 LV8257 kW (345 hp)2,000 hours / 12 years2007 (EASA)

Key innovations and certifications

Technify Motors' Centurion series engines incorporate several key technological advancements tailored for light aircraft applications. These include common-rail direct fuel injection systems, which enable precise control over fuel delivery for optimal combustion efficiency, and full authority digital engine control (FADEC) units that automate engine management, including throttle, ignition timing, and propeller pitch adjustment, reducing pilot workload and enhancing reliability. Additionally, the engines feature integrated vibration reduction mechanisms, such as rubber shock mounts and torsional vibration dampers with safety clutches, which isolate propeller and engine vibrations to ensure smoother operation and minimize structural stress in general aviation airframes. The engines' compatibility with Jet-A and other kerosene-based fuels provides significant operational and over traditional avgas-powered alternatives. By utilizing widely available Jet-A, which lacks lead additives, these diesel engines eliminate harmful lead emissions while achieving approximately 30% lower fuel consumption, translating to reduced operating costs and a smaller for operators in . Regulatory certifications underscore the engines' airworthiness and integration versatility. The (EASA) issued Type Certificate EASA.E.108 for the TAE 125 family ( 1.7 and 2.0 variants) in 2006, and EASA.E.104 for the 3.0 in 2017, both with common-rail injection and turbocharging. In 2013, the U.S. (FAA) transferred the from predecessor Thielert Aircraft Engines to Technify Motors, enabling broader North American adoption. Supplemental Type Certificates (STCs) further support retrofits, including EASA approvals for installation on the series (STC EASA.A.S.01527), Piper PA-28 series (STC EASA.10014364), and DA40/DA42 models (integrated as original equipment). In applications, the engines power a range of aircraft, notably serving as the propulsion for the , the first certified twin-engine diesel aircraft in 2004, which benefits from the engines' efficiency for extended range and lower noise profiles. They also find use in unmanned aerial vehicles (UAVs), where variants of the DA42 platform adapted for unmanned operations leverage the engines' fuel efficiency and reliability for long-endurance missions.

Operations and ownership

Facilities and production

Technify Motors' headquarters and primary manufacturing facility are situated at Platanenstrasse 14, 09356 Sankt Egidien, , encompassing , engine assembly, and testing operations. This location was established following the company's relocation in 2013 after its acquisition from proceedings. The facility supports production of diesel engines, reflecting the scale of operations in where demand remains niche compared to traditional engines. Critical components, including crankshafts and pistons, are machined in-house to ensure precision and in the assembly process. Technify Motors sources and select components from European suppliers to maintain compliance with standards, while leveraging its parent company AVIC International's for efficient distribution and exports to key markets in and . The CD-300 model was launched under the Continental Aerospace Technologies branding in 2020.

Corporate structure and affiliations

Technify Motors operates as a wholly owned of AVIC International Holding Corporation, a under the (AVIC), which has been controlled by the government since its acquisition of the company out of bankruptcy in 2013. Within the broader AVIC structure, Technify Motors is integrated into the Continental Motors Group, which encompasses key affiliates such as (formerly Continental Motors, Inc.), acquired by AVIC in 2011 through Technify Motor (USA) Inc. This affiliation facilitates shared engine development efforts, particularly for the CD-135 diesel series, leveraging combined expertise in piston and diesel technologies across the group's entities including Continental Motors Ltd. and Mattituck Services Inc. Technify Motors maintains strategic partnerships with major aircraft manufacturers for integrations, including collaborations with Diamond Aircraft for the DA42, Piper for the PA-28 series, and for the 172 Skyhawk, enabling supplemental type certificates (STCs) for retrofit installations. These partnerships are supported by authorized service centers in the United States and , operated through the Continental network to provide maintenance and overhaul services for Technify's Jet-A engines. In 2020, AVIC was added to the U.S. Department of Defense's list of Chinese military companies under Section 1237 of the for its role in activities, leading to an prohibiting U.S. persons from investing in AVIC and its subsidiaries. AVIC remains on the updated DoD Section 1260H list as of 2025, with ongoing reports noting heightened scrutiny of its subsidiaries for potential ties obfuscation. This blacklist restricted Technify Motors' access to U.S. capital markets and heightened scrutiny on its operations, though it did not halt ongoing business activities or partnerships in the aviation sector.

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