Episode
Turbulence in the Tank: The FAA’s 2030 Unleaded Transition Plan vs. Real-World Physics
- Published
- Feb 11, 2026
- Duration seconds
- 2369
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Summary
The clock is ticking on 100LL. In this deep dive, we unpack the FAA’s newly released "Draft Transition Plan," which sets a hard target to eliminate leaded aviation fuel by 2030 (2032 for Alaska). We move beyond the press releases to analyze the friction between regulatory timelines and mechanical reality. Join us as we break down the FAA's four-phase roadmap, the fierce competition between fuel contenders (G100UL, 100R, and UL100E), and the massive supply chain hurdles facing every airport and FBO in the country. Show Notes & Key Takeaways• The FAA’s 4-Phase Roadmap: ◦ Phase 1: Finalizing fuel authorizations and completing comparative testing. ◦ Phase 2: Gaining market experience with early adopters and managing supply chains. ◦ Phase 3: A nationwide rollout for the contiguous U.S. by 2030. ◦ Phase 4: A specialized transition for Alaska extending to 2032 due to unique infrastructure challenges.• The Technical Risks (What Pilots Need to Know): ◦ Valve Recession: A UND study found a statistically significant correlation between UL94 usage and exhaust valve seat recession, leading to cylinder failures. ◦ Material Compatibility: AOPA’s Baron demo with G100UL highlighted that the fuel does not evaporate like 100LL, causing paint staining, and may be incompatible with certain older fuel bladders. ◦ Microwelding: The lack of lead results in "microwelding" between valves and seats, a protective function lead oxides previously provided.• The Contenders: ◦ G100UL (GAMI): Approved via STC for nearly all engines but facing material compatibility questions. ◦ 100R (Swift Fuels): Approved via STC for specific airframes (e.g., Cessna 172) and expanding; recently achieved ASTM production specification. ◦ UL100E (LyondellBasell/VP Racing): Currently in the FAA’s PAFI testing pipeli…