MOSAIC, the FAA's Modernization of Special Airworthiness Certification reform, changes both aircraft certification and pilot privileges. The light-sport category is an aircraft certification category supported by industry standards accepted by the FAA. A sport pilot is a pilot with privileges intended for sport and recreational flying, subject to specific limits. A sales claim that an aircraft is “MOSAIC eligible” must therefore be unpacked: permission for a pilot to fly it does not establish its certification category.
For a buyer, begin with the aircraft's airworthiness certificate and operating limitations. Then establish which manufacturer documents and maintenance qualifications support the intended use. The sales description is a starting point for questions, not the evidence that answers them.
Why there are two dates
The FAA's final rule, published July 24, 2025, has two effective dates. The FAA implementation page identifies October 22, 2025 for sport pilot certification, light-sport repairman certification and maintenance provisions, and July 24, 2026 for light-sport aircraft certification provisions.
The final rule's preamble, section IV.Q, explains the longer lead time: provisions depending on new or revised industry standards needed time for those standards, FAA acceptance and manufacturers' compliance work. New light-sport aircraft delivered on or after July 24, 2026 use the new standards; the date is not merely a change to a sales description.
The reform also separates the aircraft limits for sport pilots from the light-sport certification framework. The former now have their own requirements in 14 CFR 61.316. Do not use the phrase “a sport pilot can fly it” as a substitute for reading the aircraft's certificate.
Read the aircraft's certification file
For an aircraft certificated on or after July 24, 2026, 14 CFR 21.190 requires the manufacturer's statement of compliance, a pilot's operating handbook and a maintenance and inspection program. The statement identifies the aircraft and the applicable consensus standards, among other information. Consensus standards are industry-developed technical standards; the specified standards must be accepted or approved by the FAA for the certification purpose.
The July 16, 2026 FAA acceptance notice, 91 FR 43524, identifies ASTM F3815-26a for airplanes, F3836-26 for gliders, F3840-26 for powered-lift and F3841-26 for gyroplanes, with the notice's qualifications. These are category-specific packages, not four standards every aircraft must meet. For a new aircraft delivered from July 24, ask the manufacturer to identify the applicable FAA-accepted standards and revisions in its compliance statement.
The statement is not a type certificate. The FAA's manufacturing and certification FAQ (June 2026 version) explains that the agency does not issue design or production approvals for these aircraft. It issues airworthiness certificates to individual aircraft, while the manufacturer must support the required compliance statement.
As a suggested purchase review, ask your adviser to compare the serial number across the certificate, manufacturer's statement and sale file. Then ask which operating instructions and maintenance program belong with that aircraft. If the seller supplies documents for another revision or configuration, resolve the mismatch before treating the file as complete.
Preserve the dates in an older aircraft's file
For an aircraft certificated before July 24, 2026, ask for the reference and date of the manufacturer's original statement under the earlier rules. The FAA acceptance notice preserves earlier standards for repairs and alterations of those aircraft and for specified older kit statements of compliance. An older statement is not automatically obsolete.
The FAA FAQ (June 2026 version) warns that modifying a legacy light-sport category aircraft beyond its original limits, such as weight or seating capacity, makes its airworthiness certificate ineffective. Using the new limits requires a new manufacturer statement and a new certificate under section 21.190. The FAQ treats experimental light-sport aircraft separately, so first read the actual certificate. A normal-category aircraft does not become light-sport category merely because a sport pilot may fly it: section 22.100(a)(6) excludes aircraft previously issued standard-category certificates.
There is also a specific route in section 21.190(e) for aircraft certificated in the light-sport category before July 24, 2026: the owner may submit an amended statement from the original manufacturer listing eligible aerial work operations, with supporting revisions. That process does not give every older aircraft blanket permission for aerial work, such as aerial photography, which the final rule treats as needing no extra structural assessment when the aircraft is unaltered and flown within its manual’s limits. The proposed operation must be supported by the aircraft's documents and operating limits, and the pilot must have the necessary privileges; sport pilot privileges do not authorize business flying.
In a fictional sale, an owner offers a pre-July aircraft with a new brochure listing aerial work capabilities. The buyer's next question is whether the particular aircraft has the supporting amended documents for the proposed use. Keeping the original statement alongside any amendment makes that question easier to answer.
Check the maintenance signer's privileges separately
An aircraft's broader capabilities do not by themselves expand every repairman's privileges. The FAA repairman guidance distinguishes an inspection rating from a maintenance rating and explains the category and other limitations. For example, the inspection rating is limited to condition inspections of qualifying experimental aircraft the holder owns. It is not a general authorization to maintain a customer's factory-built light-sport aircraft.
A light-sport repairman is not the only possible maintenance professional. Sections 43.3 and 43.7 also provide roles for appropriately rated mechanics, including airframe and powerplant mechanics, and certificated repair stations, within their respective privileges. Match both the work performed and the approval for return to service to the person's or organization's actual authority. Preserve the relevant inspection and maintenance entries rather than replacing them with a general claim that the aircraft is “MOSAIC compliant.” Our article on verifying the person signing an annual inspection explores the separate identity-check problem.
Before the purchase decision, request one coherent file: the aircraft's actual certification category, the documents supporting its proposed use and the records supporting its maintenance status. MOSAIC makes that distinction more useful, not less.