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Flight information service. A service provided for the purpose of giving advice and information useful for the safe and efficient conduct of flights.
Flight level. A surface of constant atmospheric pressure which is related to a specific pressure datum, 1 013.2 hecto-pascals (hPa), and is separated from other such surfaces by specific pressure intervals.
Note 1.— A pressure type altimeter calibrated in accordance with the Standard Atmosphere:
a)  when set to a QNH altimeter setting, will indicate altitude;
b)  when set to QFE altimeter setting, will indicate height above the QFE reference datum;
c)  when set to a pressure of 1 013.2 hPa, may be used to indicate flight levels.
Note 2.— The terms “height” and “altitude”, used in Note 1 above, indicate altimetric rather than geometric heights and altitudes.

Flight plan. Specified information provided to air traffic services units, relative to an intended flight or portion of a flight of an aircraft.
Note.— Specifications for flight plans are contained in Annex 2. A Model Flight Plan Form is contained in Appendix 2 to this document.

Flight status. An indication of whether a given aircraft requires special handling by air traffic services units or not.
Flight visibility. The visibility forward from the cockpit of an aircraft in flight.
Flow control. Measures designed to adjust the flow of traffic into a given airspace, along a given route, or bound for a given aerodrome, so as to ensure the most effective utilization of the airspace.
Forecast. A statement of expected meteorological conditions for a specified time or period, and for a specified area or portion of airspace.
Glide path. A descent profile determined for vertical guidance during a final approach.
Ground effect. A condition of improved performance (lift) due to the interference of the surface with the airflow pattern of the rotor system when a helicopter or other VTOL aircraft is operating near the ground.
Note.— Rotor efficiency is increased by ground effect to a height of about one rotor diameter for most helicopters.
Ground-to-air communication. One-way communication from stations or locations on the surface of the earth to aircraft.
Ground visibility. The visibility at an aerodrome, as reported by an accredited observer.
Heading. The direction in which the longitudinal axis of an aircraft is pointed, usually expressed in degrees from North (true, magnetic, compass or grid).
Height. The vertical distance of a level, a point or an object considered as a point, measured from a specified datum.
Holding point. A specified location, identified by visual or other means, in the vicinity of which the position of an aircraft in flight is maintained in accordance with air traffic control clearances.
Holding procedure. A predetermined manoeuvre which keeps an aircraft within a specified airspace while awaiting further clearance.
IFR. The symbol used to designate the instrument flight rules.
IFR flight. A flight conducted in accordance with the instrument flight rules.
IMC. The symbol used to designate instrument meteorological conditions.
INCERFA. The code word used to designate an uncertainty phase.
Independent parallel approaches. Simultaneous approaches to parallel or near-parallel instrument runways where radar separation minima between aircraft on adjacent extended runway centre lines are not prescribed.
Independent parallel departures. Simultaneous departures from parallel or near-parallel instrument runways.

Initial approach segment. That segment of an instrument approach procedure between the initial approach fix and the intermediate approach fix or, where applicable, the final approach fix or point.
Instrument approach procedure. A series of predetermined manoeuvres by reference to flight instruments with specified protection from obstacles from the initial approach fix, or where applicable, from the beginning of a defined arrival route to a point from which a landing can be completed and thereafter, if a landing is not completed, to a position at which holding or en-route obstacle clearance criteria apply.
　
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