F
Feeder route - Routs depicted on the instrument approach procedure charts to designate routs for aircraft to proceed from the en-route structure to the initial approach fix - IAF.
Final approach - That part of an instrument approach procedure which commences at the specified final approach fix or point, or where such a fix or point is not specified.
a. At the end of the last procedure turn, base turn or inbound turn of a racetrack procedure, if specified; or
b. At the point of interception of the last track specified in the approach procedure, and ends at a point in the vicinity of an aerodrome from which:
1. A landing can be made, or
2. A missed approach procedure is initiated.
Final approach course - A straight line extension of a localizer, a final approach radial/bearing, or a runway centerline all without regard to distance.
Final approach fix - FAF - The fix from which the final approach (IFR) to an airport is executed and which identifies the beginning of the final approach segment.
Final approach point - FAP - The point, applicable only to a nonprecision approach with no depicted FAF (such as an on airport VOR), where the aircraft is established inbound on the final approach course from the procedure turn and where the final approach descent may be commenced. The FAP serves as the FAF and identifies the beginning of the final approach segment.
Flight information centre - FIC - A unit established to provide flight information service and alerting service.
Flight information region - FIR - An airspace of defined dimensions within which Flight Information Service and Alerting Service are provided.
a. Flight Information Service. A service provided for the purpose of giving advice and information useful for the safe and efficient conduct of flights.
b. Alerting Service. A service provided to notify appropriate organizations regarding aircraft in need of search and rescue aid and to assist such organizations as required.
Flight level - A surface of constant atmospheric pressure which is related to a specific pressure datum, 1 013.2 hectopascals (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 a 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.
Flight visibility - The visibility forward from the cockpit of an aircraft in flight.