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fusion
main landing wheels; if temperature rises to dangerous
value (at which tyre could burst) after excessive braking,
** blows and releases pressure in controled manner.
fusion 1 So-called thermonuclear process whereby
nuclei of light elements combine to form nucleus of
heavier element, releasing very large amounts of energy;
can be controlled and sustained.
2 Collection and integration of outputs from all of a
range of sensors and warning systems, hence IDF.
3 Generally, data processing.
fusion bomb One using energy of thermonuclear fusion.
fusion power density Power generated per unit volume in
controlled thermonuclear plasma; using deuterium at 10 16
particles/ml and 60 kV, *** is about 1 kW, as kinetic
energy of reaction products.
fusion reactor Reactor in which thermonuclear fusion
takes place.
fusion welding Fusing edges of two base metals by using
a welding flame to melt edges of metals, and a welding rod,
which is similar in composition, to fuse or weld two metals
together.
FUSS Flaps-up safety speed.
future air-navigation systems Wide range of incoming
navaids including satnavs, Glonass, GNSS, FMS, FNC,
new R-navs and Mode-S.
future cycle accumulation Number of LCF or operating
(mission) cycles operator plans to accumulate on given
hardware.
FUV Far ultra-violet.
fuze Device or mechanism designed to start detonation
of high explosive under proper conditions of heat, impact,
sound, elapsed time, proximity, external command,
passage of electric current or other means, and usually
without danger of detonation before weapon is armed.
fuzzy logic Programming based on instructions not
precisely specified numerically but on best estimates
between 0 (false) and 1 (true).
FV 1 Flight visibility.
2 Prefix to three-figure designators of alloys [mainly
stainless steels] developed by Firth-Vickers (UK).
3 Finite volume [mesh code].
FVA Federación Venezolana de Aeroclubes
(Venezuela).
F VAC Vacuum thrust.
FVB Fleet Viability Board (USAF).
FVC Forebody vortex control [T adds technology].
FVD Fluorescent vacuum display.
FZP
FVLPR Hang-gliding federation (Puerto Rico).
FW 1 Fiscal week.
2 Fixed wheel (sailplane).
3 Failure warning.
4 Filament-wound, see filament winding.
5 Fighter Wing (USAAF, USAF).
6 Frequency-wild.
f.w. Full wave.
FWA Flight watch area.
FW&A Fraud, waste and abuse.
FWC 1 Filament-wound cylinder, or case.
2 Flight, or fault, warning computer.
3 Flight watch centre.
FWCS Flight-watch control station.
FWD Falling-weight deflectometer.
fwd Forward.
FWE 1 Foreign weapons evaluation (US).
2 Fighter Wing Equivalent.
FWETE Foreign weapons equipment technology evaluation
(US DoD).
FWF Firewall forward, the engine compartment of
single-engine tractor aeroplane.
FWHM Full wave, half modulation.
FWOC 1 Forward wing operations centre (RAF).
2 Fleet Weather & Oceanographics Centre (UK).
FWS 1 Fighter Weapons School (USAF).
2 Flight warning system.
3 Fire warning system.
4 Filter wedge spectrometer.
FWW Fighter Weapons Wing.
FWWS Food, water and waste subsystems.
FX Fuel type unspecified.
F X Helicopter aerodynamic force parallel to plane of
rotor disc [disk].
f(x) Function of x (math).
fXML Federated extensible markup language.
FY Fiscal year; US government runs 1 Oct. to 30 Sept.
F/Y First-class and economy or tourist.
FYDP 1 Five-year defence plan.
2 Future years defense program(US).
FYDS Flight director/yaw-damper system.
F/Y ratio Fission/yield ratio.
F Z Helicopter aerodynamic force normal to plane of
rotor disk [disc].
FZ, FZG Freezing; FZDZ freezing drizzle, FZFG fog,
FZRN rain.
fZ Transverse VSI (magnetic) component.
FZP Fresnel zone plate.
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