Glossary | Civil Aviation Safety Authority

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Keyword

Source

Category

Aggregated field Glossary

A to Z navigation

Keyword

Source

Category

Aggregated field Glossary

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

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

UOC

Definition:

Unmanned operating certificate

Glossary Certification

US FAR

Definition:

Federal Aviation Regulations (of the USA)

Glossary Regulations Source: AIS

UTA

Definition:

Upper Control Area

Glossary Air traffic control

UTC

Definition:

Coordinated Universal Time

Glossary Measurement

UTM

Definition:

Uncrewed Aircraft Systems Traffic Management

Glossary

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