The Federal Aviation Administration's Modernization of Special Airworthiness Certification rule, known as MOSAIC, reached full implementation on July 24, 2026, completing a two-phase rollout that reshapes how light-sport category aircraft are certified, maintained, and flown. Phase I took effect in October 2025 and expanded sport pilot and repairman privileges along with maintenance provisions; phase II closed out the rule by putting new light-sport category aircraft certification standards into force under 14 CFR Part 22.
Under the finalized framework, light-sport category certification no longer carries a maximum takeoff weight limit, a significant departure from the previous 1,320-pound cap. Aircraft in the category may now carry up to four seats and reach a maximum level-flight speed of 250 knots calibrated airspeed, provided they meet FAA-accepted consensus standards. Maintenance obligations remain anchored in 14 CFR Part 43 alongside manufacturer-developed inspection procedures, and the rule broadened eligibility for the light-sport repairman certificate, opening maintenance-rating privileges to more mechanics tied to the aircraft category and class of their training.
The rule also expanded what qualifying light-sport aircraft can do commercially. Beginning July 24, 2026, certain aircraft holding light-sport category airworthiness certificates may perform compensated aerial work such as aerial photography, pipeline and powerline patrol, and banner towing under 91.327, so long as the operation is backed by an FAA-accepted consensus standard and documented in the aircraft's operating limitations. The FAA is still finalizing a companion means-of-compliance standard, with public comments accepted through August 17, 2026.
Source: Gleim Aviation - https://aviation.gleim.com/2026/07/29/faa-mosaic-final-rule-explained/