The question of whether a Private Pilot certificate holder with an Airplane Multi-Engine Land (AMEL) rating — but no Single-Engine Land (SEL) rating — can exercise sport pilot privileges to fly single-engine piston trainers under the FAA's MOSAIC rule represents one of the more consequential regulatory gray areas to emerge from the sweeping 2024 overhaul of the Light Sport Aircraft framework. MOSAIC (Modernization of Special Airworthiness Certificates) significantly restructured the LSA category, raising the maximum takeoff weight from 1,320 lbs to 3,600 lbs, increasing cruise speed allowances, and expanding eligible configurations in ways that would bring aircraft like the Cessna 172 and Piper Cherokee into potential LSA eligibility for the first time. This expansion fundamentally changed the landscape of what a pilot holding only a sport pilot certificate — or a higher certificate exercising sport pilot privileges — could legally operate.
The regulatory crux of the question lies in 14 CFR §61.303, which governs who may act as pilot in command of a light-sport aircraft. The provision allows a pilot holding a certificate other than sport pilot to operate an LSA without holding a sport pilot certificate, provided they hold "the applicable category and class ratings" for the aircraft being flown. A PPL-AMEL holder holds airplane category and multi-engine land class — but not single-engine land class. Under a strict reading of the "applicable category and class" requirement, the AMEL certificate does not confer privileges in the SEL class, regardless of whether the target aircraft qualifies as an LSA under MOSAIC. This interpretation aligns with how the FAA has historically treated category and class ratings as distinct operational authorizations. The poster's reading — that the AMEL rating's airplane category satisfies the category requirement and that LSA status of the aircraft bridges the class gap — is creative but almost certainly does not withstand regulatory scrutiny without a formal FAA legal interpretation to support it.
For working pilots and aviation operators, this matters practically because MOSAIC created a scenario where sophisticated, commonly-used training aircraft now potentially qualify as LSA, making them theoretically accessible to sport pilot certificate holders and to higher-certificate pilots exercising reduced-privilege operations. A commercial pilot or airline transport pilot exercising sport pilot privileges — for example, to fly without a medical certificate using only a valid driver's license — would face the same class rating limitation. An ATP with only AMEL and no SEL endorsement on their certificate cannot simply invoke MOSAIC to log time or conduct flights in a Cherokee or 172. The privilege structure under Part 61 was not rewritten by MOSAIC in ways that collapse the SEL/AMEL distinction for certificate holders exercising downward privileges.
The broader trend here is that MOSAIC, while enormously expansive in its redefinition of aircraft eligibility, created a new layer of operational complexity precisely because it brought familiar certificated aircraft into a category previously associated with ultralight-adjacent platforms. Operators running Part 91 training environments, fractional programs, or club operations need to audit which aircraft in their fleet now meet MOSAIC LSA criteria and how that interacts with the certificate mix of their pilot population. Pilots holding unusual certificate configurations — including AMEL-only PPL holders, a profile sometimes seen among pilots who trained internationally or received military ratings conversions — should seek a formal flight instructor endorsement or FAA legal interpretation before assuming MOSAIC opens SEL aircraft to them. Until the FAA issues definitive guidance on this specific privilege intersection, the conservative and operationally sound answer is that category and class ratings remain the controlling authority, and MOSAIC's expanded aircraft eligibility does not substitute for the missing SEL rating.