UAS stands for Unmanned Aircraft System. It is the complete system used to conduct unmanned aerial operations, encompassing not just the aircraft itself but every element required for its safe and effective operation.
What Is a UAS? #
An Unmanned Aircraft System is made up of three core elements:
- The unmanned aircraft — the airframe, whether a multirotor, fixed-wing, or hybrid platform.
- The ground control station (GCS) — the hardware and software used by the remote pilot to command and monitor the aircraft.
- The communication link — the data link (typically radio frequency) that connects the aircraft to the GCS and enables command and control.
In some definitions, the UAS also includes any payload systems, launch and recovery equipment, and the personnel involved in the operation.
UAS vs UAV vs RPA — What’s the Difference? #
These terms are often used interchangeably, but they have distinct meanings in the Australian regulatory context:
- UAV (Unmanned Aerial Vehicle) — refers to the aircraft only. It is an older term still commonly used in media and general conversation.
- RPA (Remotely Piloted Aircraft) — the preferred term used by CASA and the International Civil Aviation Organization (ICAO). It emphasises that a human pilot is actively in control of the aircraft at all times.
- RPAS (Remotely Piloted Aircraft System) — the ICAO/CASA equivalent of UAS. It encompasses the RPA, the remote pilot station, and the command and control links.
- UAS (Unmanned Aircraft System) — a broader term used internationally, particularly in the United States (FAA) and in defence and academic contexts. It includes fully autonomous aircraft that may not have a human pilot actively controlling them.
In Australian civil aviation, CASA uses RPA and RPAS as the standard terminology. You will still encounter “UAS” and “UAV” frequently in industry literature, manufacturer documentation, and defence contexts.
How UAS Is Used in Australia #
The term UAS is widely used across several Australian sectors:
- Defence — The Australian Defence Force (ADF) uses UAS to refer to military drone systems, including surveillance platforms and tactical systems.
- Research and academia — Universities and research institutions commonly use UAS in publications and grant applications.
- Commercial industry — Many manufacturers and software providers use UAS in product documentation.
- International standards — Documents referencing FAA (USA), EASA (Europe), or ISO standards will typically use UAS.
Regulatory Implications #
Regardless of the term used — UAS, UAV, RPA, or RPAS — the same CASA regulations apply to civil drone operations in Australia. The regulatory framework under Civil Aviation Safety Regulations Part 101 (CASR Part 101) and the associated Manual of Standards (MOS) governs all remotely piloted aircraft operations.
Operators should be aware that “unmanned” does not mean “unregulated.” Every UAS operation in Australian airspace must comply with CASA rules, regardless of the size, purpose, or terminology used to describe the system.
Practical Notes for Operators #
- When reading international manuals or academic papers, UAS and RPAS refer to the same concept.
- When communicating with CASA or completing Australian regulatory paperwork, use the terms RPA, RPAS, and remote pilot — these are the preferred Australian civil aviation terms.
- Defence and government contracts may specifically use UAS — always check the terminology requirements of each context.
Always verify current regulations and terminology requirements with CASA directly. Regulations and standards may be updated.