| AAIB |
Air Accidents Investigation Branch |
| AIRPROX |
A situation in which, in the opinion of a pilot or air traffic services personnel, the distance between aircraft, as well as their relative positions and speed, have been such that the safety of the aircraft involved may have been compromised. |
| ATC |
Air Traffic Controller |
| ATTI mode |
Attitude mode: UAS operational mode where GPS positioning is not used/available |
| ATZ |
Aerodrome Traffic Zone |
| CAA |
UK Civil Aviation Authority |
| CAP722 |
Civil Aviation Publication 722 |
| CTR |
Controlled Traffic Region |
| DMARES |
Drone and Model Aircraft Registration and Education Scheme |
| ECCAIRS |
European Co-ordination Center for Accident and Incident Reporting Systems |
| FRZ |
Flight restriction zone (around a protected aerodrome) |
| MOR |
Mandatory Occurrence Reporting |
| MTOM |
Maximum take-off mass |
| METAR |
METeorological Aerodrome Report |
| NSF |
Non-standard flight: An aerial task that is wholly contained within Controlled Airspace and does not follow published routes or notified procedures |
| OP-AUTH |
Operational Authorisation |
| PDRA |
Pre-Determined Risk Assessment |
| RPZ |
Runway protection zone |
| Remote Pilot |
An individual responsible for safely conducting the flight of an unmanned aircraft by operating its flight controls, either manually or, when the unmanned aircraft flies automatically, by monitoring its course and remaining able to intervene and change the course at any time |
| RPA |
Remotely piloted aircraft |
| STS |
Standard Scenario |
| TAF |
Terminal Area Forecast |
| TOLZ |
Take-off and landing zone |
| UA |
Unmanned Aircraft |
| UAS |
Unmanned Aircraft System |
| Unmanned Aircraft Delegated Regulation |
Commission Delegated Regulation (EU) 2019/945 of 12 March 2019 on unmanned aircraft systems and on third-country operators of unmanned aircraft systems |
| Unmanned Aircraft Implementing Regulation |
Commission Implementing Regulation (EU) 2019/947 of 24 May 2019 on the rules and procedures for the operation of unmanned aircraft |
| VLOS |
Visual Line of Sight |