Lockheed Martin Begins Testing Fighter Jet With Sustainable Fuel Blends

Lockheed Martin’s F-35 Lightning II has taken a significant step toward sustainability with its first test flight using synthetic aviation turbine fuels (SATFs). A Royal Norwegian Air Force (RNoAF) F-35A, based at Ørland Air Station in Norway, became the first fifth-generation stealth fighter to fly with a 40% biofuel blend.

The test flight was conducted January 14, 2025 with a 60/40 ratio of traditional jet fuel and SATF. However, the aerospace giant has approved the aircraft for up to a 50/50 blend in the future.

“Lockheed Martin is committed to ensuring the F-35 is always ready for any customer mission,” stated Chauncey McIntosh, VP of Lockheed Martin’s F-35 program. “Adding new fuel sources helps make this happen by diversifying the supply chain while maintaining operational excellence. As the cornerstone of the joint fleet, the F-35 will continue to lead the U.S. and allied air dominance mission for decades to come.”

The transition to alternative fuels supports Norway’s efforts to reduce the environmental footprint of its military forces. Currently, the nation’s fighter jets account for nearly a third of the carbon emissions in its entire defense sector.

SATFs are also beneficial for energy dependence and security. According to the F-35 program’s official statement, using synthetic fuel provides flexibility in regions with limited fuel access. Despite the relatively low production rates of sustainable fuel alternatives, the US Department of Defense sees the initiative as a way to mitigate supply chain disruptions while meeting long-term climate goals.

Synthetic fuels have been in development for over a century, originally derived from coal liquefaction. Modern SATFs, however, can be produced from renewable sources like waste oils, agricultural byproducts, and fossil-based materials such as natural gas.

Lockheed Martin conducted rigorous testing to ensure SATFs meet the performance and reliability standards required for the high-performance Pratt & Whitney F135 engine. This powerplant is capable of burning up to 1,200 gallons per hour with the afterburner on.

“We have presented an ambitious long-term defence plan, significantly increasing the activity level of the Armed Forces,” explained Norway Minister of Defense Bjørn Arild Gram. “This requires us to take responsibility for reducing our climate and environmental impact, while maintaining preparedness and operational capability. This is not just about climate; it is also about technological development and preparedness.”

FMI: www.lockheedmartin.com