available capacity of a battery compared to its fully charged condition   NOTE 1 SOC is typically expressed as a percentage value (0%–100%). NOTE 2 For rechargeable lithium batteries, SOC is typically determined from one of two methods – voltage measurement or current integration.   [SOURCE: RTCA, RTCA DO-311A, Minimum operational performance standards for rechargeable lithium batteries and battery systems] [9]

indication of the capability to provide accessible energy for safe flight and landing before the corresponding end point condition of an energy storage system (ESS) (3.1.69) is met   NOTE 1 Provides a comparison of continuously observed measurements from battery sensors to the expected values during the flight. NOTE 2 Utilizes multiple inputs; examples include battery cell (3.1.26) state of charge (SOC) (3.1.126) cell temperature and cell current. NOTE 3 SOF is one of the me

indication of the degradation of capability of an energy storage system to provide accessible energy for safe flight and landing SOURCE: EUROCAE, ED-289, Guidance on determination of accessible energy in battery systems for eVTOL applications.[25]   NOTE 1 SOH considerations include, but are not limited to, the capability to store accessible energy and the capability to provide power with a certain internal efficiency. NOTE 2 SOH is one of the measures used to provide an indi

VTOL-capable aircraft (VCA) (3.1.143) which depends, principally, on engine-driven rotors mounted on tiltable nacelles for lift during take-off, landing and low-speed flight regimes, and on non-rotating aerofoil(s) for lift during high-speed flight

VTOL-capable aircraft (VCA) (3.1.143) which depends, principally, on engine-driven rotors mounted on a tiltable wing(s) for lift during take-off, landing and low-speed flight regimes, and on non-rotating aerofoil(s) for lift during high-speed flight

document issued by a Contracting State to define the design of an aircraft, remote pilot station, engine or propeller type and to certify that this design meets the appropriate airworthiness requirements of that state   NOTE 1 “Remote pilot station” is synonymous with the term “command unit”, more commonly used in the UK and EU. NOTE 2 In the context of the International Civil Aviation Organization (ICAO), a “Contracting State” refers to a sovereign state that has ratified or othe

person, in communication with the remote pilot (3.1.118), who, by unaided visual observation of the uncrewed aircraft, assists the remote pilot in keeping the uncrewed aircraft in visual line of sight (VLOS) operation (3.1.145) and safely conducting the flight [SOURCE: UK CAA, CAP 722D, Unmanned aircraft system operations in UK airspace: Abbreviations and master glossary, modified – “unmanned aircraft” replaced by “uncrewed aircraft”; “positioned alongside the remote pilot” replaced by “in

beyond visual line of sight (BVLOS) (3.1.35) operation where the primary means of achieving safe separation from crewed aircraft is with an uncrewed aircraft observer (UAO) (3.1.135), or observers, to provide detection of potential hazards and communicate this information to the remote pilot   NOTE For these operations, the observer is required to maintain visual contact with the uncrewed aircraft (UA) (3.1.134), whereas in airspace observer beyond visual line of sight (AO-BVLOS) opera

lowest airspeed at which a VTOL-capable aircraft (VCA) (3.1.143) is able to support its current mass primarily using horizontal non-rotating aerofoils   NOTE Applicable to lift-cruise aircraft (3.1.97), tilt-rotor aircraft (3.1.131), tilt-wing aircraft (3.1.132) and vectored-thrust aircraft (3.1.142) types of VCA.

VTOL-capable aircraft (VCA) (3.1.143) which depends, principally, on vectored thrust for lift during take-off, landing and low-speed flight regimes, and on non-rotating aerofoil(s) for lift during high-speed flight

power-driven, heavier-than-air aircraft, other than aeroplane or rotorcraft, capable of performing vertical take-off and landing by means of lift and thrust units used to provide lift during take-off and landing   NOTE Subcategories of VCA include, but are not limited to, lift-cruise aircraft (3.1.97), multirotor aircraft (3.1.103), tilt-rotor aircraft (3.1.131), tilt-wing aircraft (3.1.132) and vectored-thrust aircraft (3.1.142).   [SOURCE: EASA, Opinion No 03/2023] 31]