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Acronyms and abbreviations

Term Interpretation
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</span 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
STS Standard Scenario
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
TAF Terminal Area Forecast
TOLZ Take-off and landing zone
UA Unmanned Aircraft
UAS Unmanned Aircraft Systems
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