| HONEYWELL |
| USAF |  United States Air Force
|
| USNOF | United States NOTAM Office
|
| UTC | Coordinated Universal Time
|
| SAS DATALING SYSTEMS |
| Uplink | Message sent to an aircraft
|
| AVIONICS GLOSSARY |
| Unitless | No units, such as ratios, a quantity with standard units of 1, a quantity with primary units of 1, Synonyms: dimensionless,
|
| Units | A standard quantity, such as ft or mi, Synonyms: dimension,
|
| Update | A process by which position is reset with a known better position, updates occur at the data source level or at the physical device level, depending upon specific implementation of the device and the data source (choice of implementation is transparent above the data source), all updates are operator initiated, but the new position may be derived from other sources such as FLIR, MMR, or radio navigation, a basic control to a data source from controls and displays for updating a device Compare: aiding,
|
| UTM | Universal Transverse Mercator
|
| GLOSSARTIST AVIATION GLOSSARY |
| Unitless. | No units, such as ratios a quantity with standard units of 1 a quantity with primary units of 1 Synonyms: dimensionless
|
| Units. | A standard quantity, such as ft or mi Synonyms: dimension
|
| Update. | A process by which position is reset with a known better position updates occur at the data source level or at the physical device level, depending upon specific implementation of the device and the data source (choice of implementation is transparent above the data source) all updates are operator initiated, but the new position may be derived from other sources such as FLIR, MMR, or radio navigation a basic control to a data source from controls and displays for updating a device Compare: aiding
|
| UTM. | Universal Transverse Mercator
|
| APS AERO CHART |
| U | Upper (spoken ICAO ATS route designator
|
| UAB | until advised by
|
| UACC | Upper Air Control Center (used outside US)
|
| UAR | Upper Air Route
|
| UC | under construction (for chart use only)
|
| UCN | Urgent Change Notice
|
| UDA | Upper Advisory Area
|
| UDF | Ultra High Frequency Direction Finder
|
| UFA | until further advised
|
| UFN | unitil further notice
|
| UG | Uganda (east central Africa nation - bordered by Sudan, Kenya, Lake Victoria, TanzaniaRwanda and Zaire)
|
| UHF | Ultra High Frequency (300 to 3000 mHz)
|
| UIC | Upper Information Center
|
| UIR | Upper Flight Information Region
|
| UK | United Kingdom (island nation between the North Sea and Atlantic Ocean - comprised of England, Scotland, Wales and Northern Ireland plus a host of nearby smaller islands)
|
| unauthd | unauthorized
|
| unavbl | unavailable
|
| unctl | uncontrolled
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| uni | municipal
|
| unk | unknown
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| unlcig | unlimited ceiling
|
| unlgtd | unlighted
|
| unltd | unlimited
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| unmnto | unmonitored
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| unmrk | unmarked
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| unrel | unreliable
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| unrstd | unrestricted
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| unsatfy | unsatisfactory
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| unsked | unscheduled
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| unsvc | unserviceable
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| unuse | unuseable
|
| UP | Ukraine (CIS nation in eastern Europe N of the Black Sea - bordered by Belarus, Russia, Romamia, Moldova, Hundaria, Slovakia, Poland and Belarus)
|
| US | United States (nation in N America of ConUS and Alaska with territories in E Caribbean, and a state, Hawaii, in central Pacific plus many island territories and trust territories in the Central, N and W Pacific Ocean)
|
| USA | United States of America - limited to its 50 states, also, same as US above.
|
| USAF | United States Air Force
|
| USAFE | United States Air Force in Europe
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| USAFIB | US Army Flight Information Bulletin
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| USAP | US Antarctic Program
|
aero glossary
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