MOSAIC just moved from promise to certification framework

Since its final ruling in July 2025, MOSAIC has been waiting for its framework to support it. The FAA has now accepted new ASTM consensus standards for light-sport airplanes, gliders, powered-lift aircraft, and gyroplanes, giving manufacturers a defined method of demonstrating compliance under Part 22.What happened The Modernization of Special Airworthiness Certification (MOSAIC) rule expands how Light Sport Aircraft (LSA) are designed, certified and operated. It is the broader modernization effort for general aviation, with a major focus on light-sport aircraft. It replaces weight limits with performance-based metrics, such as stall speed. The ruling also expands the criteria for sport aircraft, provided those aircraft meet the new limitations.In general, LSAs undergo a simpler certification process focused on safety performance rather than rigid design constraints. The previous maximum takeoff weight limit of 1,320 lbs is by a stall speed standard of 61 knots. Manufacturers may design LSAs with retractable landing gear and controllable pitch propellers. Additionally, these aircraft can have a maximum speed of 250 knots in level flight at maximum continuous power under standard atmospheric conditions. MOSAIC was implemented in phases, with sport pilot privileges taking effect on Oct. 22, 2025, and the new aircraft-certification provisions taking effect on July 24, 2026.Part 22 is the new regulatory framework that governs the expanded light-sport category under MOSAIC. The acceptance took affect on July 16, ahead of Part 22’s July 24 full implementation date, giving manufacturers an established compliance pathway under MOSAIC.What this means for aircraft buyers Some manufacturers of these types of aircraft delayed programs to wait for full MOSAIC implementation. Now with the necessary guidance and expectations, development in the light-sport, electric, powered-lift and kit-built segments can move forward. While there will not be a flood of new aircraft overnight, companies that were discussing MOSAIC certification will be encouraged to move their certification programs forward.The long-term effects of MOSAIC and its regulatory framework remain to be seen. Ultimately, MOSAIC’s success may be judged less by the rules themselves than by the number of aircraft and manufacturers that choose to use the new certification pathway.