United Airlines Ventures has added eight new corporate partners to its Sustainable Flight Fund that aims to reduce emissions from the aviation sector through innovative technology and drive production of sustainable aviation fuel by providing startups with financial and strategic capital. The eight partners – Aircastle (a Marubeni & Mitzuho Leasing Company), Air New Zealand, Embraer, Google, HIS, Natixis Corporate & Investment Banking, Safran Corporate Ventures and Technip Energies – join 14 others in the fund that now exceeds $200 million. Described by United as a first-of-its-kind effort, the fund’s corporate partners make up all parts of the aviation supply chain, including airlines, aircraft and engine manufacturers, fuel producers, engineering and technology experts, financiers and travel management. United also offers its customers an opportunity to contribute to the fund when booking a flight, which has raised nearly $500,000 since the fund was launched in February 2023. SAF startups supported to date amongst others include Alder Renewables, Cemvita, OXCCU and Fulcrum BioEnergy, while aircraft technology startups include Archer Aviation, Eve Air Mobility, Heart Aerospace and ZeroAvia.

United has ambitions to be net zero by 2050 without relying on traditional carbon offsets and as the largest airline in the world measured by available seat miles, it is investing in companies and technologies, particularly sustainable aviation fuel, that can reduce its future emissions. In addition to the Sustainable Flight Fund, in 2021 it launched the Eco-Skies Alliance that has participation from leading global corporations to help find ways to reduce their environmental impact through the use of sustainable aviation fuels. United says it has already invested in future production of more than five billion gallons of SAF through forward purchase agreements, more than any other airline.

“SAF is the best tool we have to decarbonise airplanes, but we don’t have enough of it,” commented Andrew Chang, Managing Director of United Airlines Ventures. “To create the fuel supply we need for our fleet, United recognised that we would have to help build a brand-new industry from scratch – like wind and solar in previous decades. As part of our effort to build a new sustainable aviation ecosystem, we recruited a group of partners with the industry expertise to support our startups with both financial and strategic capital, to help them navigate the entire process from conception to commercialisation.”

United’s customers using the airline’s website or app, which now show an estimated carbon emissions for each flight, can help supplement the fund by contributing $1, $3.50 or $7 during the flight booking process before check-out. The airline reports 115,000 people have contributed since February 2023. If the 152 million people who flew on United in 2022 each contributed $3.50 to the fund, says the airline, that would be enough to build a SAF refinery capable of producing around 40 million gallons of alternative fuel annually, based on an illustrative capital expenditure benchmark of $200,000 per barrel per day to build such a facility.

One of the new partners in the fund is Brazilian aircraft manufacturer Embraer, which sees an increase in the availability of SAF as a “key driving factor” to achieve aviation sustainability and has already performed flight tests on 100% neat SAF. “In a joint collaborative effort with our partners, we can accelerate large-scale SAF production as the aviation industry progresses towards the goal of net zero emissions by 2050,” commented Embraer’s Head of Corporate Innovation, Leonardo Garnica.

Photo: United Airlines

Christopher Surgenor

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American Airlines will join an advisory panel established by aircraft manufacturer Embraer to help define its new Energia family of low-or-no-emission regional airliners. The Brazilian airframer is considering four aircraft concepts, ranging from 9- to 50-seat capacity, powered by a mix of electric, hydrogen and hybrid propulsion systems. Initially, the airframer is focused on 19-seat and 30-seat versions of two proposed aircraft, one powered by a hybrid-electric propulsion system, the other hydrogen-electric. Embraer is targeting technology readiness of the Energia Hybrid E19-HE and E30-HE aircraft by the early 2030s, and the Energia H2 Fuel Cell models E19-H2FC and E30-H2FC by 2035. American is a major operator of Embraer jets, as is another recent addition to the Energia advisory group, US contract carrier Republic Airways, which operates over 200 Embraer jets on behalf of American, Delta and United.

While most public discourse on sustainable aviation concentrates on reducing the carbon emissions of large, medium-to-long-range aircraft, predominantly by increasing the use of sustainable aviation fuels, it is the short-haul sector in which novel propulsion technologies are being developed, tested and certified, before being evolved for use in larger planes.

Currently, most focus is on retrofitting existing turboprop aircraft with new electric, hybrid-electric or hydrogen-electric powertrains, which are faster and far less expensive to certify and introduce than all-new aircraft models. But while providing low-emission propulsion for in-service aircraft, the new powertrains will also help pave the way for a new generation of ‘clean sheet’ aircraft such as Embraer’s Energia range.   

“American operates the youngest mainline fleet and the largest regional fleet among US network carriers,” explained Embraer, “and in 2022 consumed more than 2 million gallons of sustainable aviation fuel. It has also invested in the development of hydrogen-powered propulsion and infrastructure.”

Arjan Meijer, CEO of Embraer Commercial Aviation, said American had signed a MoU to help define the performance and design characteristics of the Energia aircraft concepts as part of a broader advisory group, with members including airlines, aircraft lessors, engine manufacturers and other suppliers. “It’s essential for Energia’s success that we involve a wide variety of air operators,” he said. “American joining our advisory group, with their huge presence and expertise, is a significant step for the Energia project. This group has developed into a core part of the programme because of the breadth and depth of the expertise the different members bring to the table. We’re excited to work together with a world-leading airline on the biggest challenge our industry faces.”

American’s participation in the Energia project closely followed an order for seven new Embraer E175 jets, to be operated by its wholly-owned subsidiary Envoy Air. Deliveries will begin in Q4 this year, increasing Envoy’s all-Embraer fleet to 141 jets by the end of 2024.

“As the operator of the largest US regional fleet, we believe industry collaborations aimed at advancing decarbonisation technologies are critical to helping aviation reach its goal of net-zero emissions by 2050,” said American’s VP of Sustainability, Jill Blickstein. “We look forward to working with Embraer and other members of the Energia Advisory Group to develop next-generation, zero-emission aircraft.”     

Although the Embraer Energia project initially is focused on two concepts, the airframer’s broader ambitions feature four.

The 19- and 30-seat Energia hybrid-electric concept aircraft are planned to operate up to 500 nautical miles (926 kilometres), and achieve CO2 emission reductions of 30% if operated with Jet A1 fuel, or up to 90% with SAF, while the Energia H2 Fuel Cell models are being designed to operate over 200 nautical miles (370 kilometres).

Embraer is also considering a 9-seat all-electric version, the E9-FE, again with a 200 nm range, while the largest concept under consideration, the Energia H2 Gas Turbine aircraft (E50-H2GT), will use either SAF or hydrogen to power a gas turbine. The dual fuel options for modified gas turbine engines would offer operational flexibility and lower aircraft weight, enabling a flight range of 350-500 nm (648-926 km) with 35-50 passengers, and technology readiness by 2040. 

To progress its zero-emission aircraft ambitions, Embraer has also joined forces with UK-headquartered GKN Aerospace to help accelerate the introduction of hydrogen-powered aircraft, exploring innovative hydrogen fuel cell technologies, optimised integration of these propulsion systems into airframes, and even the potential for a hydrogen flight demonstrator.

Through its H2Gear programme, GKN is already exploring development of a fuel cell system which converts liquid hydrogen to electricity. Initially, it is targeting use in sub-regional aircraft, but with potential to upscale for larger planes. 

Image: Embraer’s Energia Family concept

Tony Harrington

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After a four-year absence due to the global pandemic, the aerospace industry returned in force to the Paris Air Show, which was marked not just by 1,260-plus orders and options for new aircraft, but also by a flood of product, procurement and partnership deals focused on reducing the sector’s impact on the environment. The event was also thick with news of zero-emission aircraft and propulsion systems, technology breakthroughs promising higher efficiency and lower emissions, and research and development programmes to refine or explore paths to more sustainable aviation. An order by India’s largest airline, IndiGo, for 500 Airbus A320 and 321 neo jets to accommodate huge growth plans beyond 2030, reinforced forecasts that the global commercial fleet will double in size over the next 20 years.

Multiple commitments and technology advances were announced for the evolving electric aviation sector, most with certification and entry-into-service targets between 2025 and 2030. Miami-based AeroLease announced it had signed a letter of intent (LOI) to acquire 50 Eviation Alice electric commuter planes, while Netherlands-based start-up Maeve Aerospace unveiled a revised version of its proposed 44-seat Maeve 01 all-electric aircraft, to be powered with four 1.2 Mw electric motors. Maeve is aiming for certification in 2028 and entry into commercial service in 2030.

French start-up Aura Aero confirmed commitments and collaborations in Europe, the US and Africa for its ERA electric thrust aircraft, which will be offered in passenger and freight configurations. Maltese executive fleet operator Elit’ Avia and French regional carrier Pan Europeene signed LOIs for a combined 12 planes. Additionally, Utah-based freight airline Alpine Air Express signed a memorandum of understanding (MoU) to assist Aura Aero in gaining US certification for the ERA and Gabon-based AfriJet signed a MoU, which, while not specifying details, the airline’s CEO, Marc Gaffajoli, described as “for us, the most plausible and mature solution.”

Marseille-based airframer Daher, together with Airbus and Safran, exhibited for the first time their EcoPulse aircraft, a hybrid-electric distributed propulsion testbed, which will rely on a single independent electrical source to power multiple engines. Based on Daher’s TBM aircraft platform, the EcoPulse has six wing-mounted e-propellers provided by Safran, and two power sources – a Safran gas turbine and a battery pack supplied by Airbus. The demonstrator will begin flight testing later this year as part of a programme to define, develop and deliver a hybrid-powered plane to market by 2027.

Another French start-up, Beyond Aero, unveiled its four-passenger BYA-1 hydrogen-electric jet, while the Volt Aero Cassio 330, a 4-5 seat hybrid-electric aircraft, was also displayed ahead of its first flight in the coming weeks.

US-based electric powertrain developer MagniX said it would soon start converting a De Havilland Dash 7 aircraft into a zero-emission testbed, replacing two of its four Pratt and Whitney Canada PT6A engines with new MagniX 650 electric motors, and a pair of 450kwH battery packs. Another electric propulsion developer, Wright Electric, announced that ground trials of its new aerospace motor-generator had delivered 1 Megawatt (1,300 horsepower) of energy, enabling it to be used as a turbogenerator or auxiliary power unit for high altitude commercial or defence applications.

Airbus announced a research and development partnership with Geneva-based STMicroelectronics to explore the development of lighter, more efficient power electronics required for future hybrid-powered aircraft and all-electric air taxis. They will focus on wide bandgap Silicon Carbide and Gallium Nitride semiconductor materials, which have better electrical properties than conventional conductors such as silicon.

Rolls–Royce revealed it was ready to test its first small gas turbine, developed as a turbogenerator system for novel propulsion aircraft including electric air taxis, and hybrid-electric commuter planes seating up to 19 passengers. Additionally, regional jet maker Embraer announced a joint venture with Japanese electric motor manufacturer NIDEC to develop propulsion systems for eVTOL aircraft, with Embraer’s air taxi division Eve Air Mobility the launch customer.

Hydrogen propulsion developer ZeroAvia announced multiple deals, the largest of them an agreement to deliver 250 hydrogen-electric ZA2000 engines for 40-80 seat turboprop conversions to California-based Flyshare, which will launch a new airline, Air Cahana, on the west coast. UK-based lessor Monte also firmed a previously-provisional order for 100 ZA 600 powertrains for 9-19 seat aircraft, while French lessor Green Aerolease signed an MoU to acquire an unspecified number of ZA 600 units.

ZeroAvia also revealed that in tests with MHIRJ, the type certificate holder for CRJ regional jets, “clear applications” had been identified to retrofit regional jet aircraft with hydrogen-electric propulsion systems. The initial aircraft suitable for conversion to ZeroAvia’s proposed ZA 2000RJ powertrain would be a CRJ 700 aircraft, though the technical study also validated conversions of other in-service CRJ-series jets, including the CRJ 500 and 990 models.

Another zero-emission start-up, Sydney-based Dovetail Electric Aviation, announced a partnership with HTWO, the hydrogen power division of Korea’s Hyundai Motor Company, to test a hydrogen-electric powertrain for regional aircraft, with a view to commencing test flights as early as next year.

Deutsche Aircraft revealed the first metal was being cut for the prototype of its 40-seat D328eco regional airliner, a 100% SAF-compatible turboprop, which is scheduled for its first flight in 2025 and targeting entry into service by 2026, while at the opposite end of the scale US-based Jet Zero revealed its Z4 blended wing concept, targeted as a replacement for mid-market aircraft including the Boeing 767 and 787-8, with fuel burn savings of up to 50%.

The Airbus research arm UpNext announced a new test programme to investigate the replacement of a fossil-fuelled auxiliary power unit with a hydrogen fuel cell system to power non-propulsive aircraft functions including air conditioning, cabin lighting and avionics. An A330-200 jet will be retrofitted for the programme, taking to the air by late 2025.

Airbus also signed a MoU with US-based SAF producer LanzaJet to advance the construction of facilities to produce sustainable aviation fuel using LanzaJet’s alcohol-to-jet technology, while global energy company Sasol and Topsoe, a specialist in carbon reduction technologies, agreed to form a 50-50 joint venture to develop, build, own and operate new SAF plants, and market renewable fuels. E-fuel producer Twelve also used the Paris show to announce plans for SAF production from CO2 and renewable energy at a new plant to be built in the US state of Washington.

United Airlines Ventures revealed that another seven to eight partners would join its Sustainable Flight Fund within the next two months, and foreshadowed investment in new SAF offtake deals as producers built renewable fuel capacity.

On the eve of the Paris Air Show, seven chief technology officers from major aviation manufacturers released a statement committing to “supporting policies that increase the supply of SAF while ensuring a consistent and predictable demand through harmonised global measures.”

The CTOs of Airbus, Boeing, Dassault Aviation, GE Aerospace, Pratt & Whitney, Rolls-Royce and Safran added: “We are unified in the proposition that our industry has a prosperous and more sustainable future, and that we can make it happen through the near-term implementation of lasting industry-wide and globalised harmonised policies.”

Photo: French President Emmanuel Macron visits Aura Aero display at the Paris Air Show

Air New Zealand has named Heart Aerospace, Embraer and Universal Hydrogen as new partners in its Mission Next Generation Aircraft accelerator research programme to help identify low-or-no emission technology to replace or upgrade its fleet of 23 Q300 turboprop aircraft. The companies will join Airbus and turboprop manufacturer ATR as long-term partners for the airline as it seeks not only a sustainably-powered regional aircraft from 2030 but also clean energy and infrastructure. Also joining the programme is the Robinson Research Institute of New Zealand’s Victoria University, a specialist in superconducting technologies, which will help Air New Zealand to evaluate and validate new propulsion technologies. More than 30 aircraft developers responded to a call by the airline in late 2021 for ideas and insights to guide the transition of its short-haul fleet to more sustainable aircraft, with an aim to fly its first commercial demonstrator flight by 2026.

“This isn’t about selecting a new aircraft,” said the airline’s Chief Sustainability Officer, Kiri Hannifin. “It’s about growing our collective understanding to advance a new era of travel.

“Through our partnerships with Airbus and ATR, we’ve been able to deepen our understanding of the impact green hydrogen and battery-hybrid aircraft may have on our network, operations and infrastructure, as well as the opportunities and challenges of flying low and zero-emissions aircraft in New Zealand. Adding Universal Hydrogen, Embraer and Heart Aerospace will broaden our knowledge of the technologies being developed for potential future aircraft.”

The latest partners are developing or considering a range of zero-emission alternatives to current fossil-fuelled regional aircraft. Heart Aerospace is targeting 2028 to introduce into service the ES-30, a battery-electric regional plane, while Embraer is assessing hybrid-electric, fully electric and hydrogen fuel cell concepts for introduction between 2030 and 2035. Universal Hydrogen is developing a dual programme, in which existing aircraft are modified to use capsules of hydrogen fuel, which are transported to airports and loaded directly onto the planes they will power, instead of using fixed refuelling infrastructure.    

The Heart Aerospace ES-30 is designed to deliver flexible range and capacity to meet various regional airline requirements while producing zero emissions. With a standard seating capacity of 30 passengers, Heart says the aircraft will have a fully-electric flight range of 200 kilometres or an extended range of 400 kilometres using a reserve hybrid engine powered by sustainable aviation fuel, and will even stretch to 800 kilometres with 25 passengers. As well as major customers including United Airlines, Mesa Air Group and Air Canada, New Zealand regional operator Sounds Air also plans to introduce the ES-30. “We firmly believe that the collaborative approach is the only way to ensure that we have a sustainable future for aviation,” said Heart’s CCO Simon Newitt.

Arjan Meijer, CEO of Embraer Commercial Aviation, welcomed his company’s selection by Air New Zealand as a long-term partner in the Mission Next Gen Aircraft programme and said the airline had also agreed to join Embraer’s Energia Advisory Group, a collective of airlines, aircraft lessors, manufacturers and other aviation stakeholders consulting on the development of a new sustainable aircraft model. As well as smaller regional fleets, the Energia project is examining future sustainable aircraft seating up to 50 passengers.

“As the global leader in regional aircraft, Embraer is ideally positioned to bring disruptive technologies to smaller aircraft first,” said Meijer. “Air New Zealand, operator of a large, complex and diverse regional network, is the perfect collaborator, and we’re proud to be part of this initiative. Smaller regional aircraft are going to be the first platforms on which new fuel and propulsion systems can be introduced effectively. Embraer looks forward to contributing to Air New Zealand’s initiative and adding their expertise and requirements to Embraer’s Energia project.”

Universal Hydrogen said its modular strategy sidestepped the need for new refuelling infrastructure at airports, enabled faster fuelling of aircraft and reduced transfer losses throughout the hydrogen delivery chain. “We are pleased that Air New Zealand, one of the largest turboprop fleet operators in the world, has endorsed our hydrogen retrofit solution and infrastructure-light modular fuel delivery system,” said Paul Eremenko, CEO and co-founder of Universal Hydrogen. “We look forward to a fruitful collaboration that will help launch a new golden age of aviation.”

Its selection as a partner in the Air New Zealand programme coincided with Universal’s approval by the US Federal Aviation Administration to operate the first flight of its hydrogen-powered testbed aircraft – a converted Q300, the same type that the airline wants to replace or re-power.  The FAA has granted Universal a special airworthiness certificate in the ‘Experimental’ category, clearing the way for the prototype, dubbed ‘Lightning McClean’, to commence test flights at Grant County International Airport in Moses Lakes, Washington.  

The prototype aircraft has just completed its first taxi tests to assess ground handling qualities and the performance of the megawatt-class hydrogen fuel cell powertrain fitted in one of its engine nacelles. This powertrain is in a similar configuration to Universal’s first product, a conversion kit for ATR 72-600 turboprops, a type which Air New Zealand also operates. The Universal Hydrogen powertrain does not use a hybrid-battery system, instead transmitting power directly from hydrogen fuel cells to the electric motor, reducing the weight and lifecycle cost of the powerplant, which the company expects to be certified and in commercial service by 2025.

“We are simultaneously providing a pragmatic, near-term solution for hydrogen infrastructure and delivery, as well as for converting existing passenger aircraft to use this lightweight, safe and true zero-emissions fuel,” said Eremenko.

In December, Air New Zealand announced an initial list of partners for the programme, featuring new regional aircraft concepts representing electric, green hydrogen and hybrid propulsion options. The four partners are electric aircraft manufacturers Eviation and Beta Technologies, hybrid-electric developer VoltAero and Cranfield Aerospace, which is developing hydrogen-hybrid concepts.

With a fleet of 29 ATR 72-600 aircraft, Air New Zealand is the world’s third-largest ATR operator and the two companies say they are “deepening their existing partnership to accelerate aviation decarbonisation”. The aircraft manufacturer has launched a feasibility study on its next-generation ATR ‘EVO’ family concept, a two-engine turboprop that can be powered by 100% SAF and incorporating new propellers and enhanced cabin and systems. ATR aims to launch the programme this year and anticipates entry into service by 2030.

“ATR fully shares Air New Zealand’s ambition to accelerate the transition towards net-zero carbon emissions. Having worked together since 2018 to explore new propulsion technologies and their impact on operations and infrastructure, we are now taking this partnership to the next level,” said Nathalie Tarnaud Laude, ATR’s CEO. “With Mission Next Gen Aircraft, we will be supporting the airline in every step of this challenging adventure in investigating disruptive innovations to turn our commitments into tangible reality.”

Responded Hannifin: “Through our partnerships with Airbus and ATR, we’ve been able to deepen our understanding of the impact green hydrogen and battery hybrid aircraft may have on our network, operations and infrastructure, as well as the opportunities and challenges of flying low and zero emissions aircraft in New Zealand. Working with the world’s leading innovators is critical to addressing the climate crisis.

“These partners were selected because they are taking action now to progress decarbonising the aviation industry.”

Image: Heart Aerospace ES-30

The unprecedented heatwave sweeping the UK during the 2022 Farnborough International Airshow was a timely, if unwelcome, prod to the aviation sector that it must continue raising its game in the collective fight to mitigate the growing impact of global warming. Established and emerging aerospace players, from Airbus to ZeroAvia, used the biggest air show since the start of the pandemic to promote and progress deals, partnerships and initiatives designed to help deliver net zero emissions by 2050. In addition to more than 300 orders for new-technology aircraft, Farnborough showcased a range of developments on new propulsion systems and fuels, the growing trend to convert fossil-fuelled aircraft to zero emission power and continued strong growth in the urban air mobility sector, reports Tony Harrington. As countries met in Montreal to discuss a long-term target to reduce emissions from international aviation, the UK government released at the air show its eagerly-awaited Jet Zero Strategy to decarbonise the British aviation sector.

Having recently unveiled plans to use an A380 superjumbo as a testbed for its ZEROe hydrogen propulsion programme, Airbus announced it would convert a second A380, this time to be used in a collaboration with engine manufacturer CFM International to test new open-architecture powerplants. This engine technology, known as RISE (Revolutionary Innovation for Sustainable Engines), features large external fans which are expected to drive significant operating efficiencies and cut emissions by 20%.

Airbus UpNext, a subsidiary of the airframer, also announced a partnership with the German Aerospace Center (DLR) to study contrails created by hydrogen-powered engines. Through a new project called Blue Condor, two modified Arcus gliders will be deployed, one powered by a conventional kerosene combustion engine, the other hydrogen combustion. A chase aircraft will follow each of these craft to assess and compare their contrails at high altitude, in what will be the first in-flight tests by Airbus using a hydrogen engine.

To further support its hydrogen ambitions, Airbus has invested an undisclosed amount in Hy24, described as the world’s largest clean hydrogen infrastructure investment fund, focused on supporting large-scale green hydrogen infrastructure projects. “Since 2020, Airbus has partnered with numerous airlines, airports, energy providers and industry partners to develop a stepped approach to global hydrogen availability,” said Karine Guenan, VP ZEROe Ecosystem, Airbus. “Joining a fund of this magnitude demonstrates Airbus’ continuously active role in infrastructure investments for the production, storage and distribution of clean hydrogen worldwide.” 

Rolls-Royce and European low-cost airline easyJet also announced a hydrogen propulsion programme, the H2Zero Partnership, to jointly pioneer the development of hydrogen combustion engine technology suitable for a range of aircraft, including narrowbody airliners, from the mid-2030s. This collaboration, which combines Rolls-Royce’s engine expertise and easyJet’s operational experience, will start later this year with engine tests on the ground and ambitions by both companies to also progress to flight tests.

“In order to achieve net zero by 2050, we have always said that radical action is needed to address aviation’s climate impact,” said Johan Lundgren, CEO of easyJet. “The technology that emerges from this programme has the potential to power easyJet-size aircraft, which is why we will also be making a multi-million-pound investment into this programme. In order to achieve decarbonisation at scale, progress on the development of zero-emission technology for narrowbody aircraft is crucial. Together with Rolls-Royce, we look forward to leading the industry to tackle this challenge head-on.”

Boeing, which announced more than 200 aircraft orders at the show, has become a founding member of the University of Sheffield Energy Innovation Centre to explore various methods of producing sustainable aviation fuel, and bringing it to market. During the air show, the aircraft OEM revealed it was advancing its partnership with the University of Cambridge on the Aviation Impact Accelerator (AIA), an international group of practitioners and academics convened by the university. AIA develops interactive evidence-based models, simulations and visualisation tools for decision-makers and the wider engaged public to understand the pathways to net zero flight. The outcomes and key learnings will eventually be integrated into Boeing’s Cascade data modelling tool, which provides real-time visualisation of carbon emission reductions in aviation, and also announced during the show. The model assesses the full lifecycle impacts of renewable energy by accounting for the emissions required to produce, distribute and use alternative energy carriers such as hydrogen, electricity and SAF. Boeing said it plans to utilise the tool with airline operators, industry partners and policymakers to inform when, where and how different fuel sources intersect with new airplane designs.

The company also expanded a long-standing collaboration with Japan’s Mitsubishi Heavy industries to study electric and hydrogen propulsion, development of green hydrogen, new feedstocks and technologies for development of SAF, carbon capture and conversion, sustainable materials and new aircraft design concepts. As well, Boeing announced a $50 million investment in AEI HorizonX, a partnership it established with private equity group AE Industrial Partners to support transformative aerospace technologies.

“In order for the aviation industry to meet its net zero carbon emissions commitment by 2050 it will take all of us collaborating and investing in scientific research and testing,” said Boeing’s VP of Global Sustainability Policy, Brian Moran.

Boeing also announced a new partnership with Alder Fuels to expand production of SAF around the world. Using Boeing aircraft, the companies will test and qualify Alder-derived SAF, advance policies to expedite aviation’s energy transition.

Meanwhile, Virgin Atlantic, Corendon Dutch Airlines and Albawings have selected Boeing’s Jeppesen FliteDeck Advisor to optimise operational efficiency and reduce fuel consumption across their fleets of Boeing aircraft. During a three-month trial on its 787 Dreamliners, Virgin Atlantic found the digital solution delivered cruise fuel savings of 1.7%, saving around 1,900kg of CO2 per flight.

Hydrogen propulsion pioneer ZeroAvia secured an additional $30 million from new investors including Barclays Sustainable Impact Capital, NEOM, a sustainable regional development in Saudi Arabia, and the impact technology fund AENU, as well as additional capital from International Airlines Group, an existing investor and parent of airlines including British Airways, Iberia, Aer Lingus, Vueling and LEVEL. “Our new investors are each looking at our journey through a different lens,” said Val Miftakhov, founder and CEO of ZeroAvia, “but all energised by our mission to enable zero-emission flight using hydrogen-electric engines.”

ZeroAvia, Universal Hydrogen and Ampaire announced during the air show a total of 55 firm orders for kits to convert commuter or turboprop aircraft from fossil fuels to zero-emission electric or hydrogen propulsion, while Swiss aero-battery manufacturer H55 launched a partnership with Canadian training group CAE and Piper Aircraft to convert to battery-electric power two-thirds of CAE’s fleet of Piper Archer training aircraft. Ampaire also flagged in excess of 200 orders on the horizon for its Eco Caravan and Eco Otter aircraft, re-engined variants of the Cessna Caravan and De Havilland Twin Otter regional aircraft.

GKN Aerospace revealed during the show that advances in fuel cell technology could enable hydrogen-electric propulsion to be scaled up more quickly than previously thought. The company had assumed that hydrogen propulsion was easiest to introduce for aircraft seating around 19 passengers, but now believes the use of cryogenic cooling technology can expedite deployment of the technology to power aircraft seating 96 or even more passengers, and reducing both CO2 and non-CO2 emissions.

Norway’s Widerøe Zero, the sustainability arm of regional airline Widerøe, signed a MoU with Embraer to help develop the airframer’s new Energia family of zero emission aircraft, with four variants ranging from 19 to 50 seats, while Collins Aerospace has completed the preliminary design of a 1-megawatt motor and controller to power a hybrid-electric demonstrator aircraft for the engine manufacturer Pratt & Whitney Canada.

Collins and Pratt & Whitney also launched a new electric propulsion concept, the Scaleable Turboelectric Powertrain Technology demonstrator (STEP-tech), to power novel aircraft including high-speed electric vertical take-off or landing craft (eVTOL), unmanned aerial vehicles (UAV) and small-to-medium commercial aircraft, while new deals, developments and partnerships were announced in the eVTOL segment by companies including Germany’s Lilium, Embraer’s Eve, UK-based Vertical Aerospace, French start-up Ascendance Flight Technologies and a tie up between Rolls Royce and Hyundai Motor Group’s air taxi division, Supernal.

GE Aviation announced a milestone for its own electric engine programme, conducting the world’s first test of a hybrid-electric propulsion system in simulated high-altitude conditions. Using NASA’s Electric Aircraft Testbed (NEAT) in Sandusky, Ohio, GE assessed a pair of hybrid electric systems, one to simulate an aircraft’s left engine, the other its right engine, in conditions expected when flying at 45,000 feet. The test simulated the electrical loads needed to optimise engine performance, while propelling and powering an aircraft at that altitude.   

Mohamed Ali, VP and GM of Engineering for GE Aerospace, said: “We’re making aviation history by developing the technology to help make hybrid electric flight possible for everyday commercial air travel. We just passed a key milestone by successfully concluding the world’s first test of a high power, high voltage electric system at altitude conditions. This is one of many milestones in our journey with NASA towards demonstrating a hybrid electric aircraft engine system for a more sustainable future of flight.”

A small Spanish airline, AlbaStar, was identified at Farnborough as the European launch customer for the US-made WheelTug electric taxiing system, which enables aircraft to be manoeuvred around airports without using external tractors or their own engines. Using a small electric motor installed within the nosewheel, pilots can control all ground movements by their aircraft, including reversing from airport aerobridges. AlbaStar, which operates six Boeing 737 jets, estimates that in a year the WheelTug system could eliminate 1 million kilograms of CO2 and nitrogen oxide emissions from the airline’s operations. The WheelTug system is due to be introduced into service in mid-2023.

Image (Embraer): Norwegian airline Widerøe has signed a MoU with Embraer to help develop the airframer’s new Energia family of zero emission aircraft

Last week’s Singapore Airshow reflected a growing focus of the air transport sector on decarbonisation across the Asia-Pacific (APAC) region. Impacted by the recent eruption of Covid’s Omicron variant and onerously imposed government restrictions, the show attracted just 13,000 registered visitors, less than half the 30,000 who attended in 2019, while the number of exhibitors fell by over a third. Although there was a handful of orders for narrowbody passenger aircraft and widebody freighters, many announcements focused on sustainability partnerships and initiatives by airlines, aerospace manufacturers and fuel companies. A significant number of the declarations made at the show underscored the commitment of host nation Singapore to become a sustainable aviation hub and an APAC decarbonisation leader through measures including sustainable aviation fuels, hydrogen propulsion and the use of renewable energy on the ground, reports Tony Harrington.

To guide the strategy, the Civil Aviation Authority of Singapore (CAAS) said it will produce a Singapore Sustainable Air Hub Blueprint by early 2023 and has established a 20-member International advisory panel of industry and technology leaders to develop and progress the plan. Their first meeting was held on the sidelines of the show.

“While the immediate focus of the Singapore air hub is to revive air travel, we cannot lose sight of the longer-term challenge of climate change,” said Singapore’s Minister for Transport and Minister-in-charge of Trade Relations, S. Iswaran. “This is a challenging endeavour, especially at a time when aviation companies are still dealing with the effects of the pandemic,” he said. “It will require strong public-private partnership and cross-sectoral collaboration to innovate and reinvent the aviation ecosystem.”

In the days before the air show, a 12-month pilot programme was announced by CAAS, Singapore Airlines (SIA), Exxon Mobil, waste-to-fuel producer Neste and state investment company Temasek to assess the supply, distribution and use of sustainable aviation fuels at Singapore’s Changi Airport.

During the event, SIA – together with aerospace companies Airbus, Rolls-Royce and Safran, plus the support of aerospace sustainability consultancy Roland Berger – signed the Global Sustainable Aviation Fuel Declaration, an initiative urging airlines, aerospace suppliers and fuel partners to support accelerated development, production and use of SAF. SIA was the first airline to sign, underscoring its commitment to decarbonisation, said Lee Wen Fen, the airline’s SVP Corporate Planning. “Beyond SAF, we also use multiple levers to achieve our goals, including achieving higher operational efficiency and investing in new-generation aircraft.” 

The declaration notes that to achieve a net zero target for global aviation by 2050, it is likely a production capacity in the order of 500 million tonnes of SAF would be required. “Recognising that aviation operates within a complex framework of international regulatory and safety requirements, a large-scale uptake of SAFs will require a collaborative effort from a broad range of organisations, with each playing a different role, from research, to production and logistics, to utilisation,” it says. “We will need to work progressively towards the expansion of SAF globally and regionally, with the intention of maintaining a level playing field.”

Grazia Vittadini, Chief Technology and Strategy Officer, Rolls-Royce, added: “It is important that we combine our efforts and focus into building the momentum required to drive this forward. We are all big advocates for the development of alternative propulsion solutions including hydrogen, hybrid-electric and electric, and we also recognise that SAFs are a key building block to set us on our path towards achieving our long-term decarbonisation goals.” Airbus Chief Technical Officer Sabine Klauke urged other key aviation stakeholders to also sign the declaration. “The challenge is to further increase and encourage the uptake of SAF globally, as well as incentives and long-term policies that encourage SAF use,” she said.

Oil company Shell announced at the show that it would become the first supplier of SAF to operators in Singapore, following the upgrading of its local facility to enable blending of sustainable product with conventional aviation fuel, sourced by Shell Aviation from Neste. The first batch will be blended in Europe, before the task is transferred to Singapore. “Alongside investing in our capabilities to produce SAF, we are also focused on developing the regional infrastructure needed to get the fuel to our customers at their key locations,” said Jan Toschka, Global President, Shell Aviation. To support its aim of globally producing some two million tonnes of SAF per year by 2025, and subject to a final investment decision, Shell has proposed a biofuels facility within its Energy and Chemicals Park in Singapore, with annual capacity to produce 550,000 tonnes of low carbon fuels including SAF.

At its Singapore facility, SIA Engineering Company (SIAEC) has just completed a trial of SAF in a Rolls-Royce Trent 900 engine, which is used to power Airbus A380 aircraft. Conducted with Singapore Aero Engine Services (SAESL), a joint venture of SIAEC and Rolls-Royce, the trial used a 38% blend of SAF, producing 32% lower carbon emissions than conventional fossil jet fuel. “As SIAEC grows its engine services business, we recognise the importance of mitigating potential impact to the environment,” said the company’s CEO, Ng Chin Hwee. “The successful trial using blended SAF at our engine test facility marks SIAEC’s capability and readiness to support the aviation industry towards the net zero carbon emissions goal.”

Dominic Horwood, Services Director of Civil Aerospace, Rolls-Royce, said the SAF engine test was “an important milestone in accelerating the adoption of SAF in MRO services across the Asia-Pacific region, enabling our partners and customers in the transition to low carbon aviation.”

Neste and Japanese industrial partner Itochu Corporation announced plans to increase the availability of SAF in Japan by expanding a partnership they formed in 2020, through which Neste delivered its first SAF into Asia. Under the expanded agreement, Itochu will distribute Neste SAF in Japan, initially at the nation’s two largest international airports, Narita and Haneda in Tokyo. Neste is expanding its Singapore refinery, which it expects to increase SAF production from 100,000 tonnes to up to 1 million tonnes a year by the end of Q1 2023. 

Hydrogen propulsion also featured at the Singapore show. Beyond the SAF developments, CAAS, Changi Airport Group (CAG), Airbus and the energy engineering company Linde, announced a joint two-year study into developing an aviation hydrogen hub in Singapore. The partners will explore the transportation and storage of hydrogen, and its delivery to aircraft at existing and future airports. “While our immediate focus is on sustainable aviation fuel, we also need to explore longer-term alternatives such as hydrogen to better understand the potential and seize opportunities,” explained CAAS Director General Han Kok Juan.

In the lead up to the air show, Airbus partnered with Korean Air, Seoul’s Incheon international airport, and French industrial gases corporation Air Liquide to explore opportunities and infrastructure requirements for hydrogen powered regional flights in South Korea. “The Asia-Pacific region will play a key role as we work towards making climate-neutral aviation a reality,” said Sabine Klauke of Airbus. “By partnering with Changi Airport and with Incheon Airport, Airbus will leverage the operational and technical expertise of two of the world’s leading hubs. The studies we will carry out together reflect the need for a cross-sectoral approach, including manufacturers, airlines, regulators, airports, energy providers and academia. We need bold and coordinated action to achieve our goals.”   

For the first time in Asia, Boeing demonstrated its new 777X widebody jet, for which Singapore Airlines is an early customer. The airline announced at the show orders valued at $2.8 billion for 22 GE9X engines to power the 777X, which Boeing claims will deliver 10% lower fuel use and emissions than its competitors.

Embraer, Rolls Royce, and Norwegian regional operator Widerøe announced a 12-month partnership to study “a conceptual zero emission aircraft”, examining new propulsion technologies including all-electric, hydrogen fuel cell, and hydrogen-fuelled gas turbine powerplants.

“Technological innovations can potentially enable clean and renewable energy to power a new era of regional aviation,” said Arjan Meijer, CEO of Embraer Commercial Aviation. “The aim of our collaboration is to create new flight solutions that serve expanded market segments in a sustainable manner. I strongly believe this could lead to full sustainable connectivity, including very short haul intercity operations.”

Added Andreas Aks, CEO of Widerøe Zero, the air mobility incubator subsidiary of Widerøe: “Working with the world’s leading aerospace technology firms, our aim is to understand how a viable business can be built around zero emissions regional concepts, and to advise the manufacturers on operational requirements and customer expectations to design the best possible and sustainable air mobility service.”

Photo (Airbus): Static display at Singapore Airshow

Boeing will source two million gallons (7.5 million litres) of sustainable aviation fuel from Texas-based Epic Fuels in what the companies have described as “the largest announced SAF procurement by an airframer”. Throughout 2022, Boeing will use the SAF in its commercial operations in both Washington state and South Carolina to help fuel the test, ferry and customer flights of new aircraft, as well as operations by its giant Dreamlifter freighters that are used to transport major aircraft components and other large shipments, reports Tony Harrington. Use of the fuels will progress Boeing’s commitment that by 2030 it will offer commercial aircraft which are both able and certified to fly using 100% SAF, and also support broader initiatives by the aerospace industry to grow SAF use. In other OEM developments, European turboprop manufacturer ATR has test flown an ATR 72-600 aircraft with one of its two engines fuelled by 100% SAF, while regional jet maker Embraer is planning a similar trial in partnership with engine manufacturer Pratt & Whitney.

The latest purchase agreement between long-term partners Boeing and Epic Fuels will include supplies developed from inedible agricultural waste, which will then be used to produce a blend of 30% SAF and 70% conventional jet fuel. Epic will also continue to provide customised blends graduating from 50 to 100% SAF for use in the Boeing ecoDemonstrator programme, in which new technologies are assessed on flights by testbed aircraft. Although the maximum SAF-fossil fuel blend approved by regulators is 50/50 for commercial flights, Boeing, alongside other airframe and engine manufacturers, is working to achieve universal approval for 100% SAF use to power everyday flights.

“SAF is a safe, proven, immediate solution that will help achieve our industry’s long-term commitment to net zero carbon emissions by 2050,” said Sheila Remes, Boeing VP Environmental Sustainability. “Boeing has been a pioneer in making sustainable aviation fuels a reality. Through this agreement we will reduce our carbon footprint and have SAF available for customer deliveries as well as our own operations.” 

The company began test flights with SAF in 2008, and in 2011 helped achieve regulatory approval to use the fuels on commercial flights. In 2018, through its ecoDemonstrator programme, Boeing used a FedEx B777 freighter to perform the first test flight of a commercial aircraft using 100% SAF, and in 2019 started offering airlines the option to use SAF on delivery flights of new aircraft. The latest fuel purchase will support Boeing’s commercial operations in Everett, Renton and Seattle, in Washington state, and in North Charleston, South Carolina.

“Epic and Boeing have been partners for decades. Working together, we are making sustainability more attainable for our customers,” said Kyle O’Leary, Vice President and COO of Epic Fuels, an independent supplier with primary operations in the US and Canada. Epic has partnered with Boeing to test alternative fuels on Boeing 757 and 787 testbed aircraft, and with Alaska Airlines, first in a trial of biofuel produced from non-edible, sustainable corn, and later the first commercial flight using renewable alternative jet fuel produced from residual forest waste.  

In Europe, ATR Regional Aircraft has just achieved seven hours of ground and flight testing of an ATR 72-600 prototype aircraft, on which one of the two engines was powered by 100% sustainable aviation fuel produced from renewable waste and residues raw material such as used cooking oil. The tests were conducted with Finnish waste-to-SAF producer Neste and Swedish ATR operator Braathens Regional Airlines, as part of a collaboration to achieve certification of ATR aircraft to use 100% SAF by 2025.  The three companies are planning to operate a SAF demonstration flight with a Braathens aircraft later this year.

“The achievement of this great milestone shows that we are fully committed to making the use of 100% SAF possible and helping our customers meet their objectives to provide even more sustainable air links, not in 2035 or 2050, but in the coming years,” said Stefan Bortoli, ATR’s CEO. The company has estimated that with 100% SAF in both engines, CO2 emissions from an ATR aircraft flying on a typical regional route would be reduced by 82%.

Regional jet manufacturer Embraer and engine manufacturer Pratt & Whitney have also announced plans to operate a demonstration flight this year using 100% SAF. The flight will be operated with an Embraer E195-E2 aircraft powered by Pratt and Whitney GTF engines. “Collaboration is an essential pre-requisite for our industry to achieve our environmental goals,” said Arjan Meijer, CEO of Embraer Commercial Aviation.

GE Aviation and Emirates have also signed a Memorandum of Understanding to conduct a 100% SAF test flight by the end of this year, using an Emirates Boeing 777-300ER powered by GE90 engines.  

Photo: Boeing

Regional and business aircraft maker Embraer has released details and images of four concept aircraft as starting points for all-new sustainably-powered passenger planes, reports Tony Harrington. Simultaneously, a new partnership has been formed in the UK to progress the conversion of existing Britten-Norman commuter planes from fossil fuels to zero-emission hydrogen propulsion. Embraer said its new Energia aircraft family would range from nine to 50 seats, fly between 200 and 500 nautical miles, or 370-926 kilometres, and be powered by four different, rear-mounted propulsion systems. The intention is to offer them progressively between 2030 and 2040, as technology becomes available. In contrast, Project Fresson, a collaboration between Britten-Norman and Cranfield Aerospace Solutions to retrofit existing regional aircraft with hydrogen fuel cell technology, has been broadened through a new partnership with Isles of Scilly Steamship Group, which owns UK regional airline Skybus, and wants to transition to zero-emission flights. Meanwhile, hydrogen-electric aviation pioneer ZeroAvia has announced a slew of new collaborations, including with Alaska Air Group.

“With 50 years’ experience in developing, certifying and supporting regional aircraft, Embraer is in a unique position to make viable the introduction of new, disruptive green technologies,” said Arjan Meijer, CEO of Embraer Commercial Aviation.

Luis Carlos Affonso, Embraer’s SVP Technology and Corporate Strategy, reported the Energia family of aircraft would provide an important platform for defining future low or no emission models. “We see our role as a developer of novel technologies to help the industry achieve its sustainability targets,” he said. “There’s no easy or single solution in getting to net zero. New technologies and their supporting infrastructure will come online over time. We’re working right now to refine the first airplane concepts, the ones that can start reducing emissions sooner rather than later. Small aircraft are ideal on which to test and prove new propulsion technologies so that they can be scaled up to larger aircraft.”

The first of the new concept craft, the nine-seat Energia Hybrid (E9-HE), would be offered from 2030. Embraer said this hybrid-electric aircraft, powered by two rear-mounted engines with front propellers, would emit 50% less CO2 when used with Jet A1 fuel, and 90% less when operated with sustainable aviation fuel. It would also produce 60% less external noise and have a flight range of 500nm, or 925km, and provide a sustainable option for short haul, low-capacity scheduled flights, corporate or charter operations, emergency services such as medivac, or parcel freight. 

Next, from 2035, would be the nine-seat Energia Electric (E9-FE), a fully-electric powered aircraft for short range flights of up to 200 nm, or 370 km. This model, the only high-wing aircraft of the Energia family, would produce no emissions and 80% less noise from its single, tail mounted engine, featuring dual contra-rotating propellers.

Also from 2035 would be Embraer’s 19-seat, hydrogen-electric Energia H2 Fuel Cell aircraft (E19-H2FC), designed to operate with hydrogen fuel cells as a single power source, or as a hybrid-powered plane with batteries or gas turbines.  Again, this aircraft, with two rear-mounted electric engines and front propellers, would have a range of 200nm/370 km, suitable for higher capacity short range flights. It would produce no carbon emissions, and 70% less external noise.

The fourth, final and largest model in the Energia family would be the zero emission Energia H2 gas turbine, dual-fuel airliner (E50-H2GT), powered by either hydrogen or sustainable aviation fuel, and with 2040 “technology readiness”. It would seat 35-50 passengers, have a range of 350-500nm, or 650-925km, and be 60% quieter than similar-size conventional aircraft.

Embraer is already well-advanced in its sustainability programmes, having tested drop-in sustainable aviation fuels including sugarcane and camelina plant-derived sources on the E-Jet family of regional airliners, and is aiming to make all of its new aircraft compatible with SAF by 2030. It has also test-flown an electric demonstrator aircraft, a single-engine EMB-203 Ipanema, 100% powered by electricity, and is planning to introduce a hydrogen fuel cell demonstrator by 2025. As well, the company is progressing an all-new turboprop aircraft, which would be both 100% SAF-compatible and designed to accommodate the integration of future hydrogen propulsion technologies. It is also developing a fully-electric vertical take-off or landing vehicle, or ‘air taxi’, to enter service in 2026.

The Energia family would be competing with all-new aircraft programmes, including the yet-to-fly 19-seat ES-19 of Swedish start-up Heart Aerospace. The ES-19 has attracted customers ranging from New Zealand regional airline Sounds Air to United Airlines, which, with regional partner Mesa, has announced plans to acquire up to 200 units. Last year, Airbus revealed its own family of concept aircraft through its ZEROe hydrogen power programme. Additionally, the Energia aircraft would be competing with a growing number of electric and hydrogen retrofit programmes for existing types, such as Britten-Norman aircraft.

Britten-Norman and Cranfield Aerospace Solutions are already collaborating on Project Fresson, a programme to integrate hydrogen fuel cell technology into an eight-seat Britten-Norman Islander aircraft, with a view to reinventing the type as a zero-emission commuter plane with higher passenger payload, lower maintenance costs and a faster path to market than an all-new aircraft. The two organisations have now entered a partnership with Isles of Scilly Steamship Group to progress the introduction of zero-emission flights, possibly by 2025, to the Isles, a popular UK tourist destination.

The Group’s fleet includes the eight-aircraft local airline, Skybus, which operates both eight-seat Britten-Norman Islander and 17-seat DH6 Twin Otters on three short-range routes. Chief Executive Stuart Reid said the company had signed a letter of intent for hydrogen-powered aircraft as part of a dual commitment to support both the destination’s environment and the UK government’s plans to decarbonise air transport.

William Hynett, Chief Executive of Britten-Norman, said: “We wish to bring hydrogen-electric aircraft to the market at the earliest possible opportunity so that we can help drive our customers’ success in the new age of air transport. In striving for a zero-carbon future, it is essential that solutions are practical, affordable and sustainable, and we believe that we are well-placed to help achieve these vital goals in a way that will resonate with our global customers, many of whom seek to protect the outstandingly beautiful places in which they operate.”

Last month, ZeroAvia and Alaska Air Group announced they were to collaborate on developing a hydrogen powertrain for a 76-seat, zero-emission regional aircraft. The partner’s engineers will work together to scale ZeroAvia’s existing powertrain platform to produce the ZA2000, an engine family capable of producing between 2,000 and 5,000 kilowatts of power with a 500-mile range. Initially, the technology will be deployed into a full-size De Havilland Q400 aircraft, previously operated by Alaska subsidiary Horizon Air Industries.

UK and US based ZeroAvia will also set up a location in the Seattle area to support the initiative and Alaska has secured options for up to 50 kits to begin converting its regional aircraft to hydrogen-electric power, starting with the Q400. Alaska has joined Seattle-based Amazon Climate Pledge Fund and Bill Gates’s Breakthrough Energy Ventures as investors in ZeroAvia.

US asset investment platform Rose Cay has also announced its support for the ZeroAvia technology and intends to fund the acquisition of existing aircraft, convert them using ZeroAvia’s hydrogen-electric powertrain system and then lease them to operators worldwide. The deal includes a conditional purchase order for up to 250 engines with deliveries beginning as early as 2024. The two partners said they also intend to develop airport infrastructure projects, with committed offtake agreements, to ensure hydrogen availability.

Earlier this month, ZeroAvia entered into a collaboration with Indian state-owned aerospace and defence company Hindustan Aeronautics (HAL) to develop a Supplemental Type Certificate (STC) to incorporate a 600kW hydrogen-electric powertrain system, the ZA600, into a 19-seat Dornier 228 aircraft. Around 270 Dornier 228 aircraft have been manufactured globally, with 242 currently in service, and the STC would allow retrofit of existing airframes for both Indian military and worldwide operators. HAL also intends to build new aircraft with additional FAA approval, designated Hindustan-228, creating the opportunity to incorporate ZA600 zero-emission engines.

A Dornier 228 based at ZeroAvia’s facility at Cotswold Airport in the UK is being used as the dedicated development platform for the HyFlyer II project, which is progressing the R&D required for the ZA600 powertrain for 19-seat aircraft. The company said it had recently successfully ground-tested the powertrain and reported flight testing using the Dornier 228 would begin “in the coming months to achieve certification and entry into commercial service in 2024”.

ZeroAvia recently held its two-day 2021 Hydrogen Aviation Summit, which can be viewed here.

Top image: Embraer’s Energia family of four concept aircraft

Bottom image: The Project Fresson Britten-Norman Islander aircraft

Two prominent themes emerged at the 2021 Dubai Airshow: recalibration and decarbonisation. With recovery now underway in the air transport industry, confidence was in abundance, with major orders for passenger and freighter aircraft accompanied by the ubiquitous deployment of the word ‘sustainable’, as the air transport industry zeroed in on net zero, while simultaneously increasing operations post-pandemic, reports Tony Harrington. For the first time outside the United States, Boeing displayed and demonstrated its super-efficient but delayed 777-9 widebody, ordered by major customers including all three big Gulf carriers, Emirates, Qatar Airways and Etihad. The latter announced it was renewing and expanding its Greenliner sustainability programme – currently focused on the airline’s GEnX-powered Boeing 787 aircraft – to include its Rolls-Royce XWB-powered Airbus A350 fleet. Building on its 2020 commitment to achieve net zero by 2050, UAE national airline Etihad revealed during the air show interim targets to reducing emissions intensity and volumes, and signed a number of sustainability-focused agreements.

It announced that by 2025, the carrier would reduce its fleet emissions intensity by 20% and by 2035 it would halve its 2019-equivalent emission volumes, en-route to the net zero 2050 target.

Etihad’s first of five Airbus A350-1000s, which rolled off the production line and into storage prior to the Covid outbreak as the airline restructured its operations, was unveiled at the show in a ‘UAE50’ livery in recognition of the 50th anniversary of the federation of the UAE and Etihad’s net zero by 2050 commitment. Last month, the UAE announced the UAE Net Zero by 2050 Strategic Initiative, making it the first nation in the Middle East to commit to the emissions goal.

Tony Douglas, CEO of Etihad Aviation Group, said “there was no silver bullet, no obvious, single act” that would decarbonise aviation. “It’s going to require the combination and the sum of many different organisations and governments working together for small, incremental improvements,” he said. “Governments and regulators must help the industry to drive innovation for long-term solutions to decarbonising aviation. Support is needed for development of affordable and sufficient supply of sustainable fuels. Optimising flight paths on the busiest routes in the world would prevent untold amounts of CO2 from being pumped into the atmosphere. There is a big opportunity here that doesn’t require any new technology to implement and could be implemented today if there was a will.”

The renewal of the agreement with Boeing and GE will see them exploring opportunities to test new propulsion technologies that lower emissions. The partnership with Airbus establishes a formal framework to collaborate across a number of core areas on Etihad’s A350 fleet to improve environmental performance, specifically the promotion and commercialisation of sustainable aviation fuel, waste and weight management, and the development of data driven analysis. The agreement with Rolls-Royce will look to maximise the potential of the XWB engine as well as targeting the application of electrification technologies and hybrid systems, together with the use of electric motors for commuter aircraft and the emerging urban air mobility sector.

Additionally, Etihad signed MoUs in Dubai to collaborate with UK-based Satavia, which uses data to optimise flight plans and reduce aircraft-generated contrails and CO2, with Tadweer, the Abu Dhabi Waste Management Centre, to jointly explore opportunities to convert commercial, industrial and municipal solid waste into sustainable aviation fuel, and also with The Story Group, to plant mangrove trees in Abu Dhabi’s Jubail Mangrove Park as part of the airline’s carbon offsetting strategy.

Meanwhile, Emirates and GE Aviation also signed a MoU to test fly a GE90-powered 777-300ER with 100% sustainable aviation fuel (SAF) by the end of 2022. John Slattery, CEO of GE Aviation, said the engine manufacturer was committed to developing emission reduction technologies for both in-service and new aircraft, while Emirates COO Adel Al Redha said the partnership was “an important step” towards securing certification of 100% SAF flights.

The airline received its first A380 powered by SAF in December 2020 and, with the support of Swedavia’s Biofuel Incentive Programme, also uplifted 32 tonnes of SAF for its flights from Stockholm earlier that year. Flights from Oslo have also begun operating on SAF under the Norwegian government’s SAF blending mandate policy.

New technologies to improve the sustainable performance of existing aircraft also featured at the Dubai show.

Among them, US-based Universal Hydrogen, which is developing kits to convert conventionally-powered turboprop aircraft to hydrogen-electric propulsion systems, has secured a letter of intent from Acia Aero Leasing for kits to convert 10 ATR-72 aircraft, and options for 20 additional kits for various turboprop types. Universal has developed hydrogen capsules, which can be transported via existing freight networks from hydrogen production facilities direct to airports and loaded into the aircraft they will power.

Lufthansa Technik (LHT) and BASF showcased their Aeroshark surface film, designed to reduce aircraft aerodynamic drag. The product features micro-riblets to replicate the skin of a shark, and initially will be applied to 10 Lufthansa Cargo Boeing 777s from early 2022, reducing carbon emissions by an estimated 11,700 tonnes per year. LHT also signed a MoU with Etihad that will explore digital solutions to further optimise the airline’s technical fleet and operations management, and boost fuel efficiency.

Boeing displayed the latest aircraft in its ecoDemonstrator programme, a Boeing 737-9 on loan from Alaska Airlines, which is being used to evaluate 20 safety and sustainability projects. 

As backdrops to the show, Airbus, Boeing and Embraer all released 20-year forecasts of air travel growth – globally, by region and by segment – with significant but varied predictions of requirements for new aircraft. Airbus estimates that by 2040, 39,000 new-build planes will be needed, 29,700 of them ‘small’ jets such as the narrowbody A220 and A320; 5,300 ‘medium’ A321XLR (extra-long range) narrowbodies or twin-aisle A330neos; and 4,000 large, long-range twins. Boeing goes higher with around 43,000, including 32,660 single-aisle jets, 2,390 regional jets and 7,670 widebodies. Regional specialist Embraer forecasts the need for 10,900 new sub-150 seat aircraft, 8,640 of them jets and 2,260 turboprops. In addition to opportunities to cut operating costs, all cited the need for airlines to decarbonise their operations as one of the key drivers of fleet renewal.

Photo: Dubai Airshow 2021 (© Mark Pilling)

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