- air traffic advisory service
means a service provided within advisory airspace to ensure separation, in so far as practical, between aircraft which are operating on instrument flight rules (IFR) flight plans;
- air traffic control (ATC) clearance
means authorisation for an aircraft to proceed under conditions specified by an air traffic control unit;’;
- air traffic services (ATS) reporting office (ARO)
means a unit established for the purpose of receiving reports concerning air traffic services and flight plans submitted before departure;
- air traffic services (ATS) surveillance service
means a service provided directly by means of an ATS surveillance system;’;
- air traffic services (ATS) unit
means a generic term meaning, variously, air traffic control unit, flight information centre, aerodrome flight information service unit or air traffic services reporting office;’;
- air-taxiing
means movement of a helicopter/vertical take-off and landing (VTOL) above the surface of an aerodrome, normally in ground effect and at a ground speed normally less than 37 km/h (20 kts);’;
- alternate aerodrome
means an aerodrome to which an aircraft may proceed when it becomes either impossible or inadvisable to proceed to or to land at the aerodrome of intended landing, where the necessary services and facilities are available, where aircraft performance requirements can be met and which is operational at the expected time of use.
- automatic dependent surveillance — contract (ADS-C) agreement
means a reporting plan which establishes the conditions of ADS-C data reporting (i.e. data required by the air traffic services unit and frequency of ADS-C reports which have to be agreed to, prior to using ADS-C in the provision of air traffic services);’;
- estimated time of arrival (ETA)
means for IFR flights, the time at which it is estimated that the aircraft will arrive over that designated point, defined by reference to navigation aids, from which it is intended that an instrument approach procedure will be commenced, or, if no navigation aid is associated with the aerodrome, the time at which the aircraft will arrive over the aerodrome.
- instrument approach operation
means an approach and landing using instruments for navigation guidance based on an instrument approach procedure.
- minimum fuel
means a term used to describe a situation in which an aircraft's fuel supply has reached a state where the flight is committed to land at a specific aerodrome and no additional delay can be accepted;’;
- model aircraft
means an unmanned aircraft, other than toy aircraft, having an operating mass not exceeding limits prescribed by the competent authority, that is capable of sustained flight in the atmosphere and that is used exclusively for display or recreational activities;
- mountainous area
means an area of changing terrain profile where the changes of terrain elevation exceed 900 m (3000 ft) within a distance of 18,5 km (10,0 NM);’;
- runway-holding position
means a designated position intended to protect a runway, an obstacle limitation surface, or an instrument landing system (ILS)/microwave landing system (MLS) critical/sensitive area at which taxiing aircraft and vehicles are to stop and hold, unless otherwise authorised by the aerodrome control tower;’;
- safety-sensitive personnel
means persons who might endanger aviation safety if they perform their duties and functions improperly, including crew members, aircraft maintenance personnel, aerodrome operations personnel, rescue, fire-fighting and maintenance personnel, personnel allowed unescorted access to the movement area and air traffic controllers;’;
- toy aircraft
means an unmanned aircraft designed or intended for use, whether or not exclusively, in play by children under 14 years of age;’.