The Federal Aviation Administration has finalized its Modernization of Special Airworthiness Certification (MOSAIC) rule, and it could reshape how rural communities access electric aviation.
Announced at EAA AirVenture Oshkosh on July 22, 2025, by U.S. Transportation Secretary Sean Duffy and FAA Deputy Administrator Chris Rocheleau, the rule replaces outdated weight-based limits on Light-Sport Aircraft (LSA) with performance-based standards – a shift that opens the door to entirely new aircraft types, including electric vertical takeoff and landing (eVTOL) vehicles and powered-lift designs.
What Changed
Under the old framework, Light-Sport Aircraft were defined by maximum weight. That effectively excluded most electric and hybrid-electric designs, which tend to be heavier due to battery systems. MOSAIC flips this by defining aircraft based on performance characteristics – primarily stall speed and maximum cruise speed – rather than weight.
Key provisions:
- Weight limits eliminated. LSA eligibility is now based on a maximum stall speed of 61 knots (airplanes) or 45 knots (gliders, weight-shift-control aircraft)
- Maximum cruise speed: 250 knots in level flight at sea level
- Powered-lift aircraft included. eVTOLs, multicopters, and electric helicopters can now be certified within the LSA category – up to two seats for powered-lift, up to four seats for fixed-wing
- Sport pilot privileges expanded. Updated training and operational allowances for sport pilots
- Manufacturer-led quality assurance. Consensus standards replace some direct FAA oversight for design, production, and testing
- Noise compliance simplified. Self-certification against FAA-accepted consensus standards
Pilot privilege and operational changes took effect October 22, 2025. New aircraft certification provisions for manufacturers go into effect on July 24, 2026.
Why This Matters for Rural Communities
MOSAIC’s biggest impact may be felt outside major metros. Here’s why:
Lower certification barriers mean faster aircraft development. Manufacturers no longer need to pursue the expensive, years-long Part 23 type certification process for lighter electric aircraft. The LSA pathway is faster and cheaper, which means more aircraft reaching the market sooner.
Personal eVTOL ownership becomes viable. A two-seat electric vertical takeoff aircraft certified as LSA and operated by a sport pilot from a private field – that’s now a regulatory possibility, not science fiction. For rural property owners with acreage, this opens a direct personal air mobility option.
Rural airstrips become relevant again. Thousands of small, underused grass strips and private airfields across rural America meet the operational requirements for LSA-class eVTOL and eSTOL aircraft. These facilities don’t need million-dollar upgrades to participate in the electric aviation era.
The industry consensus standards model favors innovation. By relying on industry-developed standards rather than prescriptive FAA rules, MOSAIC creates a faster pathway for novel designs – exactly the kind of flexible approach needed for the diverse terrain and use cases rural communities present.
What to Watch
- July 24, 2026: Manufacturer certification provisions take effect. Expect a wave of new LSA-class electric aircraft applications.
- Personal eVTOL testing is already accelerating under the MOSAIC framework, with multiple manufacturers pursuing Special-LSA certification for powered-lift designs.
- The FAA also issued Advisory Circular 21.17-4, providing specific certification criteria for powered-lift aircraft – a companion document that gives manufacturers a clear roadmap.
The Bottom Line
MOSAIC doesn’t build vertiports or deploy air taxis. But it removes one of the biggest regulatory barriers to electric aviation at the lighter end of the spectrum – the exact category most likely to serve rural communities first. Rural leaders, airfield owners, and property owners should be paying attention. The regulatory door just opened.
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The MOSAIC final rule was published in the Federal Register on July 24, 2025. Full text: Federal Register, 14 CFR Parts 1, 21, 36, 43, 61, 91.