Glossary

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

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TYPH

Definition
Typhoon
Glossary Meteorology Source: AIS

U/S

Definition
Unserviceable
Glossary Airworthiness Source: AIS

UAB

Definition
Until Advised By
Glossary Communication Source: AIS

UAM

Definition
Urban air mobility
Glossary

UAS

Definition
Unmanned aerial system (UAV/RPAS)
Glossary RPAS

UAV

Definition
Unmanned aerial vehicles
Glossary RPAS Source: AIS

UDF

Definition
UHF Direction Finding Stations
Glossary Navigation Source: AIS

UFIT

Definition
Uncontrolled Flight Into Terrain
Glossary Safety Source: CASR Part 101

UFN

Definition
Until Further Notice
Glossary Communication Source: AIS

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
Online version available at: https://www.casa.gov.au//resources-and-education/glossary
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