FAR 103.1 — Ultralight Vehicle Applicability
FAR 103.1 defines what qualifies as an ultralight vehicle, including weight, fuel, speed, and stall limits. Key facts for pilot students and checkride prep.
In Plain English
FAR 103.1 sets the rules of the road for ultralight vehicles in the U.S. and, just as importantly, defines what counts as one. If your aircraft fits the definition, Part 103 applies — and you don't need a pilot certificate or aircraft airworthiness certificate to fly it. If it doesn't fit, you're operating under a different part of the FARs entirely.
To qualify as an ultralight vehicle, the aircraft must:
- Be used (or intended) for manned operation by a single occupant
- Be flown for recreation or sport only
- Have no U.S. or foreign airworthiness certificate
- If unpowered, weigh less than 155 pounds
- If powered:
- Weigh less than 254 pounds empty (excluding floats and emergency safety devices like a ballistic parachute)
- Have a fuel capacity of 5 U.S. gallons or less
- Be incapable of more than 55 knots CAS at full power in level flight
- Have a power-off stall speed of 24 knots CAS or less
Why it matters: exceeding any single limit — even by a pound or a knot — pushes the vehicle out of Part 103 and into the world of certificated aircraft and pilot certificates.
Regulation Text
14 CFR § 103.1§ 103.1 Applicability.
This part prescribes rules governing the operation of ultralight vehicles in the United States. For the purposes of this part, an ultralight vehicle is a vehicle that:
(a) Is used or intended to be used for manned operation in the air by a single occupant;
(b) Is used or intended to be used for recreation or sport purposes only;
(c) Does not have any U.S. or foreign airworthiness certificate; and
(d) If unpowered, weighs less than 155 pounds; or
(e) If powered:
(1) Weighs less than 254 pounds empty weight, excluding floats and safety devices which are intended for deployment in a potentially catastrophic situation;
(2) Has a fuel capacity not exceeding 5 U.S. gallons;
(3) Is not capable of more than 55 knots calibrated airspeed at full power in level flight; and
(4) Has a power-off stall speed which does not exceed 24 knots calibrated airspeed.
Oral Exam Questions a DPE Might Ask
Q1What is an ultralight vehicle, and where is it defined?
Per FAR 103.1, an ultralight is a single-occupant vehicle used only for recreation or sport, with no airworthiness certificate, weighing under 155 lbs unpowered or under 254 lbs empty if powered, with limited fuel, speed, and stall speed.
Q2What are the performance and fuel limits for a powered ultralight?
Under FAR 103.1, a powered ultralight must have no more than 5 U.S. gallons of fuel capacity, a top level-flight speed of 55 knots CAS or less at full power, and a power-off stall speed not exceeding 24 knots CAS.
Q3Can you carry a passenger or use an ultralight for business under Part 103?
No. FAR 103.1 limits ultralight operations to a single occupant and to recreation or sport purposes only, so passengers and any business or commercial use are prohibited.
Studying for a checkride?
Related Sections in Part 103