Ultralight aircraft exist outside of the United States. In most countries, ultralights are a class of aircraft. A completely different legal concept is valid within the USA. The FAA makes explicitly clear that ultralight vehicles are not aircraft, are not regulated as aircraft, and are exempt from aircraft rules. Instead, they are treated as powersport items and have to follow their own ruleset, FAR-103, which is the most compact aviation regulation in existence. It can be printed on the front- and backside of a single piece of paper. (In addition, a few explanatory pages have been published by the FAA.)
While ultralights in other countries might have airworthiness certificates, an airworthiness certificate is not allowed for an ultralight vehicle in the USA. (Any existing airworthiness certificate has to be surrendered to the issueing agency, including foreign agencies, before usage as an ultralight vehicle becomes legal.)
The FAA emphasizes that airworthiness and compliance with FAR-103 is the responsibility of the user during every flight.
In the United States, ultralights are not registered, nor is the pilot required to have a pilot's certificate. [1] [2]
Regulation of ultralight aircraft in the United States is covered by the Code of Federal Regulations, Title 14 (Federal Aviation Regulations), Part 103, or 14 CFR Part 103, which defines an "ultralight" as a vehicle that:
In daytime, flights may not take place in Class A, B, C, D airspace, plus a special type of E airspace directly surrounding an airport, unless the pilot has prior authorization from the ATC facility with jurisdiction over that airspace. [3]
Ultralight vehicles cannot be flown over any congested area of a city, town, or settlement, or over any open air assembly of persons. [1]
Weight allowances can be made for amphibious landing gear, and devices deployed in an emergency, which includes ballistic parachute systems. [1]
In the United States, while no certification or training is required by law for ultralights, training is strongly advised. [2]
FAR-103 applies to three-axis planes, weightshift planes, very light rotorcraft, balloons, hang gliders, PPGs, or whatever contraption people use to take flight. A lawnchair like that of the Lawnchair Larry flight is lighter than 155 pounds and thus qualifies as an unpowered FAR-103 Ultralight, if the user finds reliable means to stay away from the path of aircraft, outside airport airspace, and abides by the rules for cloud clearance.
As soon as a second or extra-wide seat is fitted, the applicability of FAR-103 ends.
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