Glossary of Terms
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Ultimate load. The limit load multiplied by the appropriate factor of safety.
UN number. The four-digit number assigned by the United Nations Committee of Experts on the Transport of Dangerous
Unaccompanied baggage. Baggage that is transported as cargo and may or may not be carried on the same aircraft with the
Unburned hydrocarbons. The total of hydrocarbon compounds of all classes and molecular weights contained in a gas sample,
Unclaimed baggage. Baggage that arrives at an airport and is not picked up or claimed by a passenger.
Unidentified baggage. Baggage at an airport, with or without a baggage tag, which is not picked up by or identified with a
Unit load device
Unit load device (ULD). Any type of freight container, aircraft container, aircraft pallet with a net, or aircraft pallet with a net over an
Upper-air chart. A meteorological chart relating to a specified upper-air surface or layer of the atmosphere.