AEC

airspace encounter category

AEH

airborne electronic hardware

AGL

above ground level

AIP

aeronautical information publication

AMC

acceptable means of compliance

ANSP

air navigation service provider

AO

airspace observer

ARC

air risk class

ATC

air traffic control

BVLOS

beyond visual line of sight

C2

command and control

C3

command, control and communication

ConOps

concept of operations

CRM

crew resource management

DAA

detect and avoid

DSSS

direct-sequence spread spectrum

DVR

Design verification report

EASA

European Union Aviation Safety Agency

ERM

emergency response manager

ERP

emergency response plan

ERT

emergency response team

EU

European Union

EVLOS

extended visual line of sight

FHSS

frequency-hopping spread spectrum

FTD

flight training device

GDOP

geometric dilution of precision

GM

guidance material

GNSS

Global Navigation Satellite System

GRC

ground risk class

HMI

human machine interface

ICAO

International Civil Aviation Organization

ISM

industrial, scientific and medical

JARUS

Joint Authorities for Rulemaking on Unmanned Systems

LACA

low-altitude controlled airspace (below 150 m (500 ft))

MCC

multi-crew cooperation

METAR

aviation routine weather report (in (aeronautical) meteorological code)

MS

Member State

MTOM

maximum take-off mass

NAA

national aviation authority

OFDM

orthogonal frequency-division multiplexing

OM

operations manual

OSO

operational safety objective

PDOP

position dilution of precision

PDRA

predefined risk assessment

RBO

risk-based oversight

RCP

required communication performance

RF

radio frequency

RLP

required C2 link performance

RP

remote pilot

RPS

remote pilot station

SAIL

specific assurance and integrity level

SDS

safety data sheets

SMM

safety management manual

SORA

specific operations risk assessment

SPECI

aviation selected special weather code in (aeronautical) meteorological code

STS

standard scenario

SW

software

TAF

terminal area forecast

TCAS

traffic collision avoidance system

TMPR

tactical mitigation performance requirement

TOM

take-off mass

UA

unmanned aircraft

UAS

unmanned aircraft system

UAS Regulation

Commission Implementing Regulation (EU) 2019/947 of 24 May 2019 on the rules and procedures for the operation of unmanned aircraft

USSP

U-space service provider

VLL

very low level

VLOS

visual line of sight

VO

visual observer