For the first time in aviation history, a helicopter has completed a flight with both its engines running entirely on sustainable aviation fuel. The Airbus H225, powered by two Safran Makila 2 engines burning 100% SAF, marked a significant step in the company’s push to decarbonize rotary-wing flight — without sacrificing a single metric of performance.
At a glance
- Sustainable aviation fuel: SAF can reduce carbon dioxide emissions by up to 90% compared to conventional jet fuel when used at full concentration, according to Airbus Helicopters’ Chief Technical Officer Stefan Thome.
- Twin-engine milestone: Previous Airbus tests ran SAF in only one engine at a time — this flight marked the first dual-engine, 100% SAF operation ever recorded for a helicopter.
- Net-zero certification target: Airbus aims to certify 100% SAF use across all its commercial aircraft and helicopters by 2030, as part of a broader industry goal of net-zero aviation by 2050 C.E.
What sustainable aviation fuel actually is
SAF is not a single substance — it is a category of fuels produced from biological and waste-based sources rather than fossil fuels. The dominant production method is called the Hydrotreated Esters and Fatty Acids (HEFA) process, which converts waste fats, cooking oils, and grease into fuel that behaves chemically very close to conventional jet fuel.
Other feedstocks include municipal solid waste, agricultural residue, forestry waste, captured carbon, and waste gases. The result is a drop-in fuel — one that requires no engine modifications and can move through existing fueling infrastructure. Today, aviation regulations allow blends of up to 50% SAF mixed with conventional fuel without any engine changes. Over a full life cycle, those blended fuels can cut emissions by as much as 85%.
At 100% concentration, the numbers get more dramatic. Airbus and its partners project reductions of up to 90% in CO₂ emissions from SAF alone — not counting additional efficiency gains from new aircraft designs or operations.
Building toward 2030 certification
This test flight did not appear out of nowhere. Airbus has been running a methodical series of SAF validation flights, each one expanding the scope of what’s been proven. In November 2021 C.E., an H225 flew with 100% SAF in one engine. In March 2022 C.E., a single engine on an A380 jumbo jet ran on 100% SAF. Each step tests not just whether engines can run on the fuel, but how aircraft systems respond — fuel pumps, seals, sensors, temperature behavior across different operating conditions.
The dual-engine H225 flight extends that record to the rotary-wing world. Helicopters operate differently from fixed-wing aircraft, with engines under more variable load and subject to different vibration profiles. Proving that SAF performs equivalently under those conditions matters both for certification and for operator confidence.
Further tests are planned across different helicopter types with different engine configurations and fuel blends.
Why helicopter emissions matter
Helicopters are a relatively small slice of global aviation emissions, but they serve functions that are hard to electrify: offshore oil and gas transport, search and rescue, emergency medical services, remote infrastructure support. Many of these missions require range and payload capacity that current battery technology cannot match. SAF offers a realistic near-term path to cutting the carbon footprint of these operations without grounding them.
“This flight with SAF powering the twin engines of the H225 is an important milestone for the helicopter industry,” said Stefan Thome, Executive Vice President and Chief Technical Officer of Airbus Helicopters. “It marks a new stage in our journey to certify the use of 100 percent SAF in our helicopters, a fact that would mean a reduction of up to 90 percent in CO₂ emissions alone.”
The honest constraints
SAF is not a complete solution on its own. Current global production of sustainable aviation fuel meets only a tiny fraction of aviation’s total demand, and scaling up supply chains fast enough to hit 2030 and 2050 targets remains a serious industrial and economic challenge. Some feedstocks, if poorly managed, carry their own environmental trade-offs. The technology works — but deployment at scale is still an open question that the industry has not resolved.
Still, the H225’s dual-engine flight moves the answer closer. Each successful test narrows the gap between what aviation can do today and what it will need to do by the middle of the century. That is exactly the kind of incremental, evidence-based progress that makes ambitious targets feel, for the first time, achievable.
Read more
For more on this story, see: New Atlas
For more from Good News for Humankind, see:
- U.K. cancer death rates fall to their lowest level on record
- Marie-Louise Eta becomes the first female head coach in men’s top-flight European football
- The Good News for Humankind archive on climate change
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