Glossary
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ULD: See
Aircraft unit load devices.
UN: United
Nations.
UN number:
Four-digit number assigned to dangerous substances by
the UN. Assists safe handling of such items. See also
Dangerous goods.
Unit load:
A number of items of cargo in a single box or container
or loaded on a pallet.
Unit load device:
See Aircraft unit load device.
Useable fuel:
Total mass of fuel consumable in flight; usually some
95% - 98% of total capacity.
Useful load:
Payload plus useable fuel.
Utility tug:
A vehicle used for towing baggage carts or trailers
between cargo terminals and the aircraft.
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