MOSAIC Broadens the Light-Sport Horizon, but Buyers Must Separate Plans From Approvals

The light-sport aircraft market is looking beyond its familiar two-seat boundaries. An October 13 report summarizing AvBrief commentary identifies four-seat airplanes and twin-engine designs that could pursue special light-sport aircraft certification under the FAA’s Modernization of Special Airworthiness Certification, or MOSAIC, rules.

The development matters to prospective owners because it could broaden the selection of aircraft available through the S-LSA certification pathway. But the current picture is a mixture of overseas approvals, flying aircraft and proposed designs—not a roster of newly approved airplanes ready for U.S. delivery.

A wider certification pathway

The AvBrief commentary, written by Bernardo Malfitano and summarized by Avi-Go, examines how MOSAIC allows larger aircraft, including designs with up to four seats and twin engines, to be certified through compliance with ASTM standards.

Separately, an October 9 FLYING article carried by NewsBreak describes the elimination of the 1,320-pound LSA weight limit as an opening for larger, more capable training aircraft, citing the Tecnam P-Mentor as an example. Together, the reports point toward a broader role for light-sport certification in training and personal aviation.

For pilots, however, the certification pathway and operating privileges are different questions. The AvBrief summary explicitly notes that twins can qualify for S-LSA certification under MOSAIC but cannot be flown by sport pilots. A light-sport designation therefore should not be treated as blanket permission to operate an aircraft—or as proof that its capabilities fit a particular pilot’s qualifications.

Brazil provides an example, not a U.S. approval

Brazil offers a useful indication of what broader light-sport certification can produce. According to the AvBrief summary, the country adopted its own version of MOSAIC in 2022. Its first certified four-seat S-LSA was the Van’s RV-10, certified by Flyer Indústria Aeronáutica together with Van’s.

Since 2023, the report says, buyers in Brazil have been able to purchase a factory-built, certified RV-10 for commercial instruction or rental. That is a concrete example of the pathway supporting uses beyond private recreational flying. It does not, by itself, establish U.S. certification or availability.

The commentary also includes the four-seat Sling TSi and identifies the Veloce ANG and Bushliner 1850 Cyclone as candidates whose manufacturers are working toward certification. The Bushliner is currently offered as a factory-assisted amateur-built aircraft in Washington state. For a buyer comparing those options, the distinction between an existing amateur-built offering and a proposed S-LSA version is fundamental.

Twin-engine projects are at different stages

The twin-engine candidates illustrate how widely development maturity can vary within a single market discussion. The report identifies four designs using Rotax 916 iS engines: the Aero AT AT-6, Alpi Aviation Alpi 800 Pioneer, Sling Twin and Skytron.

The AT-6 had recently made its first flight. The Alpi 800 Pioneer was unveiled at Aero Friedrichshafen 2026, with a European kit offering and U.S. MOSAIC certification planned. By contrast, only computer-generated images of the Sling Twin had been released, with a prototype hoped for at EAA AirVenture 2027.

Those milestones are not interchangeable. A first flight, a certification plan and a hoped-for prototype appearance each indicate a different level of progress. None should be read as a confirmed delivery commitment.

Two-seat development continues

Expansion at the upper end does not mean the traditional two-seat segment has stopped attracting entrants. Japan’s Sankei reported October 12 that Tokyo-based Land, a company involved in music and other businesses, established wholly owned Land Aeronautics in Sanjo, Niigata Prefecture, in August and began accepting reservations.

The planned offering is limited to 100 aircraft, priced at ¥25 million each. Sankei describes a two-seat aircraft with an anticipated range of approximately 800 kilometers. The supplied report does not establish U.S. certification or a U.S. delivery program.

For prospective owners, this week’s news supports cautious optimism about future choice. The practical task remains aircraft-specific: verify certification status, pilot eligibility, demonstrated performance and delivery commitments before treating an expanding regulatory opportunity as an available ownership solution.