Definitions
Article 3
For the purpose of this Regulation, the definitions in Article 2 of Regulation (EC) No 549/2004 shall apply.
The following definitions shall also apply:
1. ‘surveillance data’ means any data item, time stamped or not, within the surveillance system that pertains to:
  1. aircraft 2D position;
  2. aircraft vertical position;
  3. aircraft attitude;
  4. aircraft identity;
  5. 24-bit ICAO aircraft address;
  6. aircraft intent;
  7. aircraft velocity;
  8. aircraft acceleration;
2. ‘operator’ means a person, organisation or enterprise engaged in or offering to engage in an aircraft operation;
3. ‘ADS-B’ means automatic dependent surveillance — broadcast, a surveillance technique in which aircraft automatically provide, via a data link, data derived from on-board navigation and position-fixing systems;
4. ‘ADS-B Out’ means the provision of ADS-B surveillance data from an aircraft transmit perspective;
5. ‘harmful interference’ means interference that prevents the achievement of the performance requirements;
6. ‘surveillance chain’ means a system composed of the aggregation of airborne and ground-based constituents used to determine the respective surveillance data items of aircraft, including the surveillance data processing system, if deployed;
7. ‘cooperative surveillance chain’ means a surveillance chain requiring both ground and airborne components to determine surveillance data items;
8. ‘surveillance data processing system’ means a system that processes all surveillance inputs received to form a best estimate of the current aircraft surveillance data;
9. ‘aircraft identification’ means a group of letters, figures or a combination thereof which is either identical to, or the coded equivalent of, the aircraft call sign to be used in air-to-ground communications, and which is used to identify the aircraft in ground-to-ground air traffic services communications;
10. ‘State aircraft’ means any aircraft used for military, customs and police purposes;
11. ‘transport type State aircraft’ means fixed wing State aircraft that are designed for the purpose of transporting persons and/or cargo;
12. ‘extrapolate’ means to project, predict or extend known data based upon values within an already observed time interval;
13. ‘coasted’ means extrapolated for a period longer than the ground surveillance systems update period;
14. ‘time of applicability’ means the time at which the data item has been measured by the surveillance chain or the time for which it has been calculated by the surveillance chain;
15. ‘accuracy’ means the degree of conformity of the provided value of a data item with its actual value at the time when the data item is output from the surveillance chain;
16. ‘availability’ means the degree to which a system or component is operational and accessible when required for use;
17. ‘integrity’ means the degree of undetected (at system level) non-conformity of the input value of the data item with its output value;
18. ‘continuity’ means the probability that a system will perform its required function without unscheduled interruption, assuming that the system is available at the initiation of the intended operation;
19. ‘timeliness’ means the difference between the time of output of a data item and the time of applicability of that data item.