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FIRST TIER CENTER- The ARTCC immediately
adjacent to the impacted center.
FIX- A geographical position determined by visual
reference to the surface, by reference to one or more
radio NAVAIDs, by celestial plotting, or by another
navigational device.
FIX BALANCING- A process whereby aircraft are
evenly distributed over several available arrival fixes
reducing delays and controller workload.
FLAG- A warning device incorporated in certain
airborne navigation and flight instruments indicating
that:
a. Instruments are inoperative or otherwise not
operating satisfactorily, or
b. Signal strength or quality of the received signal
falls below acceptable values.
FLAG ALARM-
(See FLAG.)
FLAMEOUT- An emergency condition caused by a
loss of engine power.
FLAMEOUT PATTERN- An approach normally
conducted by a single‐engine military aircraft
experiencing loss or anticipating loss of engine
2/14/08 Pilot/Controller Glossary
PCG F-3
power or control. The standard overhead approach
starts at a relatively high altitude over a runway
(“high key”) followed by a continuous 180 degree
turn to a high, wide position (“low key”) followed by
a continuous 180 degree turn final. The standard
straight‐in pattern starts at a point that results in a
straight‐in approach with a high rate of descent to the
runway. Flameout approaches terminate in the type
approach requested by the pilot (normally fullstop).
FLIGHT CHECK- A call‐sign prefix used by FAA
aircraft engaged in flight inspection/certification of
navigational aids and flight procedures. The word
“recorded” may be added as a suffix; e.g., “Flight
Check 320 recorded” to indicate that an automated
flight inspection is in progress in terminal areas.
(See FLIGHT INSPECTION.)
(Refer to AIM.)
FLIGHT FOLLOWING-
(See TRAFFIC ADVISORIES.)
FLIGHT INFORMATION REGION- 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 INFORMATION SERVICE- A service
provided for the purpose of giving advice and
information useful for the safe and efficient conduct
of flights.
FLIGHT INSPECTION- Inflight investigation and
evaluation of a navigational aid to determine whether
it meets established tolerances.
(See FLIGHT CHECK.)
(See NAVIGATIONAL AID.)
FLIGHT LEVEL- A level of constant atmospheric
pressure related to a reference datum of 29.92 inches
of mercury. Each is stated in three digits that represent
hundreds of feet. For example, flight level (FL) 250
represents a barometric altimeter indication of
25,000 feet; FL 255, an indication of 25,500 feet.
(See ICAO term FLIGHT LEVEL.)
FLIGHT LEVEL [ICAO]- A surface of constant
atmospheric pressure which is related to a specific
pressure datum, 1013.2 hPa (1013.2 mb), 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;
and
c. When set to a pressure of 1013.2 hPa
(1013.2 mb), 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 LINE- A term used to describe the precise
movement of a civil photogrammetric aircraft along
a predetermined course(s) at a predetermined altitude
during the actual photographic run.
FLIGHT MANAGEMENT SYSTEMS- A computer
system that uses a large data base to allow routes
to be preprogrammed and fed into the system by
means of a data loader. The system is constantly
updated with respect to position accuracy by
reference to conventional navigation aids. The
sophisticated program and its associated data base
insures that the most appropriate aids are automatically
selected during the information update cycle.
FLIGHT MANAGEMENT SYSTEM PROCEDURE-
An arrival, departure, or approach procedure
developed for use by aircraft with a slant (/) E or slant
　
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