Paragraph 1 InterpretationI1

In these Rules—

• “ACAS” means an aircraft system based on secondary surveillance radar (“SSR”) transponder signals which operates independently of ground based equipment to provide advice to the pilot on potential conflicting aircraft that are equipped with SSR transponders;

• “air-taxiing” means flight by a helicopter, or other type of aircraft capable of vertical take-off and landing, above the surface of an aerodrome at a ground speed of less than 20 knots for the purpose of taxiing in accordance with normal aviation practice;

• “air traffic control clearance” means an authorisation by an air traffic control unit for an aircraft to proceed under conditions specified by that unit;

• “anti-collision light” means—

  1. (a)

     in relation to rotorcraft, a flashing red light;

  2. (b)

     in relation to any other aircraft, a flashing red or flashing white light;

  in either case showing in all directions;

• “Class C ATS route” means a route notified as such;

• “day” means the time from half an hour before sunrise until half an hour after sunset (both times exclusive), sunset and sunrise being determined at surface level;

• “flight plan” means a plan containing such information as may be notified in respect of an air traffic control service unit, being information provided or to be provided to that unit which relates to an intended flight, or part of a flight, of an aircraft;

• “ground visibility” means the horizontal visibility at ground level;

• “IFR flight” means a flight conducted in accordance with the Instrument Flight Rules in Section 6 of these Rules;

• “runway” means an area, whether or not paved, which is provided for the take-off or landing of aircraft;

• “simulated instrument flight conditions” means a flight during which mechanical or optical devices are used in order to reduce the field of vision or the range of visibility from the cockpit of the aircraft;

• “special VFR flight” means a flight—

  1. (a)

     made at any time in a control zone which is Class A airspace; or

  2. (b)

     made in any other control zone in either Instrument Meteorological Conditions or at night;

  3. (c)

     in respect of which the appropriate air traffic control unit has given permission for the flight to be made in accordance with special instructions given by that unit instead of in accordance with the Instrument Flight Rules; and

  4. (d)

     in the course of which the aircraft complies with any instructions given by that unit and the aircraft remains clear of cloud and with the surface in sight;

• “VFR flight” means a flight conducted in accordance with the Visual Flight Rules in Section 5 of these Rules;