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FAA Requests Public Input on Transition to Unleaded Aviation Fuel

FAA Requests Public Input on Transition to Unleaded Aviation Fuel
The Federal Aviation Administration (FAA) has opened a public consultation on its Draft Transition Plan to Unleaded Aviation Gasoline, unveiled on January 12. This plan proposes a phased strategy for aircraft owners and the broader aviation sector to gradually move away from 100LL, the leaded fuel predominantly used by piston-engine aircraft, over the coming years.
The FAA stresses that the draft plan is not a regulatory mandate but a guiding framework intended to facilitate a safe and orderly transition. Developed in partnership with the Eliminate Aviation Gasoline Lead Emissions (EAGLE) initiative—a collaborative effort between government and industry stakeholders, including the Aircraft Owners and Pilots Association (AOPA)—the plan seeks to address the long-term objective of eliminating leaded aviation fuel.
Stakeholder engagement is a critical component of this process. EAGLE has encouraged aircraft owners and pilots to review the draft and provide feedback, particularly concerning safety, operational feasibility, and practical considerations. The initiative emphasizes that transparency and safety remain paramount throughout the transition.
The Four-Phase Transition Framework
The draft outlines a four-phase approach aimed at eliminating low-lead aviation fuel by the end of 2030 across most of the United States, with Alaska scheduled to follow by 2032 due to its unique logistical and operational challenges.
The initial phase involves completing FAA approvals for candidate unleaded fuels and publishing comparative testing data to inform industry decisions. Following this, early adopters will begin using unleaded fuels as efforts intensify to expand fuel availability and develop the necessary infrastructure. The third phase envisions a national transition within the contiguous United States, where unleaded fuel will be widely accessible and most piston-engine aircraft will be authorized or modified to operate on it. The final phase addresses Alaska’s transition, reflecting its distinct fuel supply and operational environment.
Murray Huling, AOPA’s Vice President of Regulatory Affairs, highlighted the evolving nature of the plan, noting that while 2030 is often perceived as a firm deadline, it should be regarded as a target subject to change as the process unfolds. He emphasized the importance of understanding the transition’s trajectory in its early stages.
Challenges and Industry Implications
The shift to unleaded aviation fuel presents several significant challenges. Modifying existing aircraft engines to accommodate new fuel types, ensuring widespread distribution and availability, and addressing any potential safety or performance issues are critical concerns. The transition may also prompt increased scrutiny of fuel suppliers and could lead to fluctuations in aviation fuel prices.
In response, industry players may accelerate the development of new engine technologies compatible with unleaded fuels and invest in infrastructure upgrades to support the emerging standard. Currently, three unleaded fuels are at various stages of FAA authorization, including fleet authorizations that permit their use across groups of aircraft and engines.
The FAA’s solicitation of public input underscores the necessity of broad industry collaboration and consensus-building to navigate these complexities. This cooperative approach aims to ensure a smooth and safe transition for all stakeholders involved in piston-engine aviation.

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