MOSAIC (Modernization of Special Airworthiness Certification)

The Modernization of Special Airworthiness Certification rule — MOSAIC — is the most significant overhaul of the US light-sport regime since the light-sport aircraft (LSA) category was created in 2004. The FAA released the final rule in July 2025, announced at EAA AirVenture Oshkosh, and it takes effect in two distinct phases. The first phase, covering expanded sport-pilot privileges and the certification and maintenance of light-sport aircraft, became effective on October 22, 2025. The second phase, covering the new airworthiness standards for building and certificating LSA themselves, becomes effective on July 24, 2026. Operators should treat these as separate milestones, because the pilot-side changes are already in force while the aircraft-side changes arrive later.

The defining change is how a light-sport aircraft is bounded. The original rule capped LSA at a fixed maximum takeoff weight — 1,320 pounds for landplanes — which forced designers into a narrow, lightweight envelope. MOSAIC removes that weight cap entirely and instead limits the category by a maximum clean stall speed. For sport-pilot eligibility, the airplane's stalling speed in the clean configuration (VS1) rises from 45 knots to 59 knots calibrated airspeed. Because heavier, more capable four-seat trainers and touring aircraft can meet a 59-knot stall speed, aircraft that were previously well outside the LSA definition can now qualify, dramatically widening the fleet available to sport pilots and to light-sport-based flying clubs.

Sport-pilot privileges expand accordingly. Seating limits rise from two seats to four, although a sport pilot may still carry no more than one passenger regardless of how many seats the aircraft has. With appropriate training and instructor endorsements, sport pilots gain the ability to fly at night, to operate aircraft with retractable landing gear and controllable-pitch (constant-speed) propellers, and to fly higher-powered airplanes than the previous rules allowed. MOSAIC also opens sport-pilot operation of helicopters and other rotorcraft under defined conditions. Crucially, these new privileges are gated by demonstrated competency and logbook endorsements rather than granted automatically, which keeps the safety framework aligned with how the FAA already handles endorsements under 14 CFR Part 61.

MOSAIC is distinct from — but interacts with — the existing light-sport-aircraft category and the sport-pilot-certificate. The sport-pilot certificate remains a certificate flown without an FAA medical, using a valid US driver's license as the medical basis (the same arrangement that predates BasicMed), and MOSAIC does not change that medical framework. What it changes is the size and capability of the aircraft a sport pilot may fly and the operations they may conduct. For anyone weighing a sport-pilot path against a private-pilot certificate, MOSAIC narrows the practical gap considerably.

MOSAIC reshapes the economics of entry-level and recreational training. A four-seat aircraft that qualifies as a light-sport aircraft can be flown by a sport pilot on a driver's license medical, which lowers the medical barrier that turns some prospective students away before their first lesson. Flight schools that historically steered every inquiry toward the private-pilot track now have a genuinely capable sport-pilot product to offer, and the wider eligible fleet means a school's existing aircraft may fall inside the category without buying anything new.

Flying clubs and equity groups stand to benefit particularly. The removal of the weight cap means clubs can consider aircraft that were previously off-limits to sport pilots, and the phased effective dates give operators a planning window: the pilot-privilege changes are already usable, while the aircraft-certification changes give manufacturers and clubs until mid-2026 to align. Schools should be precise with prospective students about what a sport pilot can and cannot do — the one-passenger limit and the endorsement gates on night, complex, and high-performance operations remain real constraints even as the overall envelope widens.

Because MOSAIC ties new sport-pilot privileges to specific training and logbook endorsements, Aviatize's Training Management module tracks which pilots have earned the night, retractable-gear, controllable-pitch-propeller, and high-performance sign-offs, so a school never books a student onto an operation their endorsements do not yet cover. Currency and endorsement records live in the same place as the rest of the training file, keeping the picture complete.

As the airworthiness phase takes effect in 2026, the Maintenance Control and Compliance & Auditing modules help schools and clubs keep the inspection and maintenance records that light-sport aircraft require, and give an accountable manager a clear audit trail across a mixed fleet of standard-category and light-sport aircraft.