Glossary

Look up acronyms, technical terms and phrases to find out what they mean.

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UHDT

Definition
Unable Higher Due Traffic
Glossary Communication

UHF

Definition
Ultra High Frequency (300 to 3,000 MHZ)
Glossary Communication Source: AIS

UIR

Definition
Upper Flight Information Region
Glossary Air traffic control Source: AIS

UL

Definition
Upper Limits
Glossary Flight planning Navigation Source: AIS

UNA

Definition
Unable
Glossary Communication

UNAP

Definition
Unable to Approve
Glossary Communication Source: AIS

UNICOM

Definition
Universal Communication
Glossary Communication Source: AIS

UNL

Definition
Unlimited
Glossary Measurement Source: AIS

UNLC

Definition
Unlicensed
Glossary Licensing

UNREL

Definition
Unreliable
Glossary Communication Source: AIS
Online version available at: https://www.casa.gov.au//resources-and-education/glossary
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