What Qualifies as an Ultralight Vehicle According to USUA?

Updated

According to USUA, a powered ultralight must meet all of these conditions at once: it carries a single occupant, is used only for recreation or sport, weighs less than 254 pounds empty (excluding floats and safety devices meant for catastrophic situations), holds no more than 5 U.S. gallons of fuel, and cannot exceed 55 knots calibrated airspeed at full power in level flight, with a power-off stall speed no higher than 24 knots. If any one condition fails, the aircraft does not qualify under this definition.

The Five Criteria in Detail

USUA lists the definition as a set of separate requirements. Treat them as cumulative, not as alternatives.

Criterion Requirement What to check
Occupancy Single occupant only Seating and intended operation
Purpose Recreation or sport only No commercial or other use
Empty weight Less than 254 lb, excluding floats and safety devices for catastrophic situations Weigh the aircraft as configured
Fuel capacity Not exceeding 5 U.S. gallons Tank and system capacity
Speed No more than 55 knots calibrated airspeed at full power in level flight; power-off stall speed no more than 24 knots Both limits apply

Occupancy and purpose

The vehicle must be used or intended for manned operation in the air by a single occupant, and it must be used or intended for recreation or sport purposes only. A two-seat aircraft, or one flown for purposes outside recreation and sport, falls outside this definition regardless of its weight or speed.

Weight

A powered ultralight weighs less than 254 pounds empty. The exclusion matters: floats and safety devices intended for deployment in a potentially catastrophic situation are not counted toward that empty weight. If you are evaluating a specific aircraft, confirm what is installed and whether it falls under that exclusion rather than assuming the scale number settles it.

Fuel capacity

Fuel capacity must not exceed 5 U.S. gallons. This is a capacity limit, not a range or endurance figure.

Speed

Two speed limits apply together: the aircraft must not be capable of more than 55 knots calibrated airspeed at full power in level flight, and its power-off stall speed must not exceed 24 knots calibrated airspeed. An aircraft that is slow enough in level flight but stalls above 24 knots still does not meet the definition.

Why the Definition Matters Beyond the Checklist

USUA describes itself as the organization the FAA, the media, and other groups turn to on ultralight issues, and it works with LAMA and others on updating Sport Pilot regulations and policy. That context explains why the definition is written as a fixed rule set: it is the line between an ultralight and other sport aircraft, and it is the basis for how the category is treated in regulation and public discussion.

USUA also notes that ultralights come in many forms — airplanes, powered parachutes, trikes, and more — and that it now supports gyroplanes as sport aircraft. The five criteria above are what those different shapes have in common; the airframe type itself is not the test.

A Practical Way to Evaluate an Aircraft

  1. Confirm the aircraft is intended for one occupant and for recreation or sport only.
  2. Establish empty weight, setting aside floats and qualifying safety devices, and compare it to 254 pounds.
  3. Check fuel capacity against 5 U.S. gallons.
  4. Verify both speed figures: level-flight maximum at full power (55 knots calibrated) and power-off stall (24 knots calibrated).
  5. If any single item fails, treat the aircraft as outside USUA's ultralight definition and look at the applicable sport aircraft rules instead.

For pilots moving from interest to participation, USUA's membership page offers join and renewal options, and its site identifies Curtis Hughes's The Ultralight Pilot's Flight Training Manual, published by USUA and used by most ultralight flight instructors, as a training resource for fixed-wing ultralight pilots.