A light-sport aircraft must have no more than one piston-powered engine. This engine may drive a fixed-angle or ground-adjustable propeller -- as opposed to "in-cabin adjustable" or "variable pitch." The maximum attainable speed in level flight must be 120 knots per hour or less. The cabin must be unpressurized. The total useful load of passengers, fuel and cargo may not exceed 660 pounds.
In addition to the previously listed restrictions, a fully loaded and fueled light-sport aircraft may not weigh more than 1,320 pounds. The landing gear for a land-based aircraft must not be retractable.
The total weight of a seaplane may not exceed 1,430 pounds. However, a seaplane may have retractable landing gear.
