ULTRALIGHT AIRCRAFT - An aircraft operated for sport or recreational purposes which does not require FAA registration, an airworthiness certificate, nor pilot certification. They are primarily single occupant vehicles, although some two place vehicles are authorized for training purposes. Operation of an ultra light vehicle in certain airspace requires authorization from ATC.
UNDERCARRIAGE - The landing-gear of a land based aircraft, including struts, frames and wheels.
UNICOM - Universal Communication. A common radio frequency used at uncontrolled (non-tower) airports for local pilot communication.
UPWASH - The slight, upward flow of air just prior to its reaching the leading edge of a rapidly moving airfoil.
USEFUL LOAD - The weight of the crew, passengers, fuel, baggage and ballast, generally excluding emergency or portable equipment and ordnance.
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