MOSAIC Broadens Light-Sport Aircraft Plans, but Pilot Privileges Remain a Separate Question

Light-sport aviation’s expanding design possibilities came into sharper focus this past week, with reports describing a proposed four-seat twin-turboprop and several aircraft candidates for certification under the FAA’s MOSAIC framework. Together, they point toward a broader market spanning recreational flying, personal transportation and professional training—but not an equivalent expansion of sport-pilot privileges.

The most concrete new development is Wasatch Aero’s outline for a twin-engine trainer. Reported by AviNews on October 15, the project illustrates how manufacturers are exploring the revised framework’s allowance for four seats, multiple engines and turbine propulsion. It also demonstrates why prospective owners must distinguish development ambitions from aircraft available for purchase.

A turbine trainer family takes shape

Utah-based Wasatch Aero places the proposed twin later in a development roadmap that starts with its two-seat SD3 and turbine-powered SD3T trainers. The twin would use two Turbo Tech turbine engines producing 148 horsepower each—the same powerplant planned for the single-engine SD3T.

Wasatch lists preliminary targets of a 200-knot cruise, fuel consumption of 12 to 14 gallons per hour and a 23,000-foot service ceiling. Those figures are design objectives, not demonstrated operating results. The aircraft remains in the design phase, with neither pricing nor a delivery schedule announced.

The nearer-term milestones concern the single-engine trainers. Wasatch is targeting initial SD3 and SD3T prototype flights in late 2026 and anticipates deliveries in 2027. The twin has no comparable timetable.

For flight schools, the potential attraction is commonality: one engine type across single- and multiengine trainers could simplify parts planning and maintenance practices while supporting a progression within one aircraft family. Whether that translates into competitive training costs remains unresolved; the reported specifications and schedule do not yet establish the economics of an operating fleet.

Certification does not confer pilot privileges

The central regulatory distinction is straightforward. As described in the reporting, MOSAIC broadens the aircraft that manufacturers can certify in the light-sport category. It does not give sport pilots multiengine privileges.

FAA aviation safety inspector Marcel Bernard, cited in the Wasatch report, explicitly separates those two issues: multiengine aircraft may qualify for light-sport certification, but sport pilots cannot fly them using sport-pilot privileges. Operating the proposed Wasatch twin would require an appropriate higher-level pilot certificate and multiengine rating.

For buyers, the practical consequence is that a light-sport designation alone is not enough to establish whether an aircraft matches their qualifications. Certification eligibility, pilot privileges and the aircraft’s actual development status need separate examination.

Four-seat candidates illustrate the broader shift

An October 13 AviNews account of Bernardo Malfitano’s AvBrief commentary identifies additional four-seat and twin-engine candidates for special light-sport aircraft certification through ASTM standards.

Brazil provides an existing example rather than merely a proposal. According to the account, Flyer Indústria Aeronáutica and Van’s certified the RV-10 there, and a factory-built certified version has been available since 2023 for uses including commercial instruction and rental. That Brazilian experience is relevant to the discussion, but it should not be read as confirmation of U.S. certification or availability.

The same commentary identifies twin-engine projects at markedly different stages. The Aero AT AT-6 had recently made its first flight, while the Sling Twin had only computer-generated images released, with a prototype hoped for at EAA AirVenture 2027. Such differences matter more to a near-term purchase decision than inclusion on a list of possible MOSAIC aircraft.

New propulsion, measured expectations

Electric aviation is another development to watch. An October 17 AviNews market report places trainers and light-sport aircraft at 34% of its 2026 zero-emission aircraft market estimate. However, that estimate includes propulsion systems and airport hydrogen and charging infrastructure, not just aircraft sales. Its growth projections therefore are not evidence of equivalent growth in delivered light-sport airframes.

For pilots and prospective owners, this week’s news supports an optimistic but disciplined view: the range of potential light-sport designs is widening. Purchase decisions still depend on verified performance, certification status, delivery readiness, support arrangements and the qualifications needed to fly the aircraft.