# Commission Regulation (EU) No 255/2010 of 25 March 2010 laying down common rules on air traffic flow management (Text with EEA relevance), Article 2: Definitions

Extent: E+W+S+N.I.

For the purposes of this Regulation the definitions provided for in Article 2 of Regulation (EC) No 549/2004 and Article 2 of Council Regulation (EEC) No 95/93 shall apply.
The following definitions shall also apply:
1..‘air traffic flow management (ATFM) measure’ means the actions taken to perform air traffic flow management and capacity management;
2..‘operator’ means a person, organisation or enterprise engaged in or offering to engage in an aircraft operation;
3..‘IFR’ means the symbol used to designate instrument flight rules;
4..‘air traffic services (ATS) reporting office’ means an ATS unit established for the purpose of receiving reports concerning ATS and flight plans submitted before the first delivery of an air traffic control clearance;
5..‘local air traffic flow management (ATFM) unit’ means a flow management entity operating on behalf of one or more other flow management entities as the interface between the central unit for ATFM and an ATS unit or a group of such units;
6..‘critical event’ means an unusual situation or crisis involving a major loss of UK ATMS capacity, or a major imbalance between UK ATMS capacity and demand, or a major failure in the information flow in one or several parts of the UK ATMS;
7..‘air traffic flow management (ATFM) departure slot’ means a calculated take-off time attributed by the central unit for ATFM with a time tolerance managed by the local ATS unit;
8..‘route and traffic orientation’ means policies and procedures for the use of routes by aircraft;
9..‘multiple flight plan’ means more than one flight plan for the same intended flight between two airports;
10..‘air traffic service (ATS) unit sector configuration’ means the four dimensional description of an ATS unit airspace sector, or group of sectors, which may be operated on a permanent or temporary basis;
11..‘aerodrome taxi time’ means the pre-determined time value from off-block to take-off, expressed in minutes and valid during normal airport operations;
12..‘updated flight position’ means aircraft position, updated by surveillance data, flight plan data or position reports;
13..‘air traffic control clearance’ means the authorisation for an aircraft to proceed under conditions specified by an air traffic control unit;
14..‘flight plan suspension’ means the process initiated by an entity performing ATFM to ensure that a change is made to the flight plan by the operator before the execution of the flight;
15..‘air service’ means a flight or a series of flights carrying passengers, cargo or mail for remuneration or hire;
16..‘operational log’ means a log of the ATFM system, converted into a database to allow quick search of ATFM data.

---
Source: https://www.legislation.gov.uk/eur/2010/255/article/2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2010-255/article-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.