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Abbreviations

Search or browse commonly used abbreviations in drone and aviation regulations.

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A1 Open category A1 Lowest-risk subcategory for lightweight drones.
A2 Open category A2 Subcategory with increased separation requirements from people.
A3 Open category A3 Operations conducted far from people and buildings.
AGL Above Ground Level Height above ground level.
AIP Aeronautical Information Publication Official publication containing aeronautical information.
AMSL Above Mean Sea Level Height above mean sea level.
ARC Air Risk Class Risk classification within SORA that determines the airspace risk of a drone operation.
ATTI Attitude mode Flight mode without GPS position hold.
ATZ Aerodrome Traffic Zone Traffic zone around an aerodrome.
BVLOS — No explanation available yet.
BVLOS BVLOS Operations conducted beyond the pilot’s visual range.
C2 C2 Command and control link between drone and pilot.
CAA — No explanation available yet.
CE Conformité Européenne EU conformity marking.
CTR Control Zone Controlled airspace around an aerodrome.
Detect & Avoid Detect & Avoid System that detects and avoids obstacles.
EASA European Union Aviation Safety Agency European authority responsible for aviation safety.
EASA — No explanation available yet.
ESC Electronic Speed Controller Controls motor speed.
EVLOS Extended Visual Line of Sight Operation supported by visual observers.
Failsafe Failsafe Automatic safety procedure during system failure.
FPV First Person View Flying using live onboard camera feed.
FRIA FRIA Area where drone operations are restricted or prohibited.
Geo-fencing Geo-fencing Technology preventing entry into restricted areas.
GL Ground Level Height measured from the ground.
GNSS Global Navigation Satellite System Satellite system used for positioning.
ICAO International Civil Aviation Organization UN agency for international aviation.
IFR Instrument Flight Rules Flight conducted using instruments.
IMU Inertial Measurement Unit Sensor measuring motion and orientation.
ISO International Organization for Standardization International standards organization.
LiPo Lithium Polymer battery High-energy rechargeable battery.
LOS Line of Sight Direct visual contact between pilot and drone.
LUC Light UAS Operator Certificate Certificate granting extended operational privileges.
METAR METAR Current aerodrome weather report.
MTOM MTOM Maximum permitted weight including payload.
MTOM — No explanation available yet.
NOTAM Notice to Airmen Temporary aviation notice.
Payload Payload Additional equipment or weight carried by the drone.
PDRA Predefined Risk Assessment Standardised risk assessment for specific drone operations.
QFE QFE Altimeter setting based on airfield pressure.
QNH QNH Altimeter setting based on mean sea level.
RID RID System allowing remote identification of drones.
RTK Real Time Kinematic High-precision positioning technique.
STS Standard Scenario Pre-approved operational scenario.
TAF TAF Aerodrome weather forecast.
TMA Terminal Manoeuvring Area Airspace surrounding major airports.
U-SPACE U-SPACE Airspace designed for high-density drone traffic.
UAS — No explanation available yet.
UAS UAS Complete system including aircraft and control station.
UAV UAV The aircraft itself without a human pilot.
VFR Visual Flight Rules Flight conducted using visual references.
VLOS — No explanation available yet.
VLOS VLOS The drone remains visible to the remote pilot at all times.