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false ogive
false ogive Rounded fairing added to nose of vehicle to
improve streamlining. Also known as ballistic cap.
false ribs Auxiliary nose ribs between main ribs forward
of front spar to support fabric covering and improve
contour.
false spar Secondary spar not attached to fuselage, used
as mounting for movable surfaces.
false start Gas-turbine starting cycle which fails to
achieve stable light-up; ability to survive is certification
requirement.
FALW Family of air-launched weapons.
FAM 1 Fighter attack manoeuvring.
2 Federal Air Marshal [P adds program].
3 Final-approach mode.
Fame Full-sky astrometric mapping explorer.
Famet Fuerzas Aeromoviles del Ejercito de Tierra
[army aviation] (Spain).
FAMG Field artillery missile group (USA).
familiarisation Training to acquaint technical personnel
with specific system.
Famis Full-aircraft management and inertial system.
famished Air-intercept code: ‘Have you any instructions
for me’ (DoD).
Famos Floating-gate avalanche-injection MOS.
FAMS 1 Family of air missile systems.
2 Federal Air Marshal Service (US 2002–).
FAN 1 Forward air navigator.
2 False-alarm normalization [normally holds CFAR to
10 –6 ].
fan 1 Vaned rotary device for producing airflow.
2 Multi-bladed rotor, usually with single stage, serving
as first stage of blading in turbofan [last stage in aft-*
engine] and handling much greater airflow than core.
3 Propeller, when function is moving air rather than
providing thrust.
4 Assembly of three or more reconnaissance or
mapping cameras at such angles to each other as to
provide wide lateral coverage with overlapping images.
fan blade off Most severe turbofan certification requirement,
ability to contain and survive severance of one
entire fan rotor blade at redline speed without danger to
aircraft.
F&E Facilities and equipment.
F&F Fire and forget.
F&R Function and reliability.
F&U Fire and update.
fan duct Annular duct [in B-52H twin C-ducts] through
which air compressed by fan of turbofan engine is delivered.
Can be short, ending in annular propulsive nozzle
surrounding core casing, or extend to rear where there
may be a mixer. Almost always incorporates a reverser.
fan engine 1 See turbofan.
2 Three-cylinder engine with one cylinder vertical and
others at about 45° to it.
fan exit case Casing surrounding fan (2) carrying
reverser and often accessory gearbox.
fan-failure clutch When necessary, disconnects engine
fan from transmission of tilt-rotor.
Fang Federation of Anti-Noise Groups (charity, UK,
1973–, office East Molesey).
fanjet, fan jet Turbofan, or aircraft powered thereby
(colloq.).
fan lift Jet V/STOL system using large axial fans inside
faraday
wings and fuselage covered by shutters above and below
which are opened only in hovering mode.
fan mapping Aerial survey using fan of cameras.
fan marker Radio position-fix beacon radiating in
vertical, fan-shaped [ellipse or dumbell] pattern, keyed for
identification (see radio beacon, Z-marker, FM-marker).
fanned-beam antenna Unidirectional antenna so
designed that transverse cross-sections of major lobe are
approximately elliptical.
fanning beam Radiant-energy beam (eg radar) which
sweeps back and forth over a limited arc (see scan).
Fanpac Fan-noise prediction and control.
fan ramjet See augmented turbofan.
FANS, Fans Future air navigation system[s]; several
variants with suffix letter or number (ICAO).
fan straightener Radial vanes in front of and/or behind
fan in wind tunnel to introduce or remove flow rotation
usually counteracting that of fan.
fan stream burning Thrust boosting by burning fuel in
airflow downstream of fan; in some vectored engines same
as PCB, in ejector lift and RALS after travel along large
pipe.
FanWing Patented VTOL lift/propulsion system based
on powered ‘paddlewheels’ rotating on transverse axes.
FAO Fabrication assistée par ordinateur (F).
FAOR Fighter area of responsibility.
FAP 1 Fleet average performance.
2 Force Aérienne de Projection (F).
3 Fuel-adjusted profit.
4 Frangible armour-piercing; DS adds discardingsabot.
5 Forward, or flight, attendant panel.
6 Final approach, or final-approach point.
7 Federation of Australian Pilots.
8 Fluorinated aluminium powder.
9 Federación Argentina de Paracaidismo [sport parachuting]
(Argentina).
FAPA 1 Future Aviation Professionals of America.
2 First Air Pilots Association.
FAQ Frequently-asked question[s].
FAR 1 Federal Aviation Regulation[s]; eg FAR-23 [also
called Part 23] defines flight performance of private and
taxi a/c 12,500 lb [5670 kg] MTOW, FAR-25 covers a/c
above this limit, Pt 36 is concerned with noise and
FAR-103 with single-seat ultralights, for example.
2 False-alarm rate.
3 Fighter/attack/recon. (pilot grading, USAF).
4 Field assessment (or functional area) review (US).
5 Force d’Action Rapide (F).
6 Forward-area rearm [or rearm/refuel, P adds point].
7 Federal Acquisition Regulations.
8 Federatia Aeronautica Romana [office, R-70139
Bucharest] (Romania).
9 Fatal-accident rate.
FARA Formula Air Racing Association [office,
London W1X] (UK).
farad SI unit of electrical capacity, Symbol F; capacity
of condenser (capacitor), which has potential difference of
1V when charged with 1C. More commonly used: microfarad
and picofarad.
faraday Symbol F; non-SI unit of electric charge carried
by 1 mole of singly-charged carbon-12 ions =
9.6487×10 4 C.
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