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FTIR
3 Fast tactical imagery.
4 Flight test instrumentation.
5 Fictional threat image.
6 Flight-training instructor.
7 Association of aeronautical engineers (G).
8 Flight-time integration.
9 Federal Telecommunications Infrastructure (FAA).
FTIR Fourier transform of IR [S adds spectroscopy].
FTIT Fan-turbine inlet temperature.
FTK Freight tonne-kilometre(s).
FtL Foot-lambert (non-SI unit of luminance or brightness).
ftL, FTL Flight-time limitation.
FTLB Flight-Time Limitation Board (UK).
FTLO 1 Fast-tuned local oscillator.
2 False-target lock-on.
FTM 1 Frequency/time modulation.
2 Flight-test mission objective(s).
3 Fleet technical management.
ft/min Feet [climb or descent] per minute.
FTNW Future tactical nuclear weapon.
FTO 1 Flexible take-off.
2 Flying training organization.
3 Federation of Tour Operators (UK).
FTP 1 Functional test, procedure.
FTPP Fault-tolerant power panel.
2 File transfer protocol.
FTR 1 Failed to return.
2 Flat-tyre radius.
3 False-target rejection.
4 Future transport rotorcraft.
Ftr Fighter.
FTRG Fleet Tactical Readiness Group (USN).
FTS 1 Flying Training School.
2 Fatigue-test specimen.
3 Federal Telecommunications System.
4 Flexibe turret, or track, system.
5 Flight termination system (UAV).
ft/s Feet per second, which see for conversions.
FTSA 1 Fault-tolerant system architecture.
2 Fédération Tunisienne des Sports Aériens [office,
Tunis 1001] (Tunisia).
FTSC Fault-tolerant spacecraft (or spaceborne)
computer.
FTTU Fliegender Technologie-trager unbemannt =
unmanned technology testbed (ETAP).
FTU 1 Forward transmitter unit.
2 Ferry Training Unit (RAF).
3 Formal Training Unit (USAF).
F tu , F TU Ultimate tensile strength; F often italic.
FTV Flight test vehicle.
FTW Follow-through warhead.
FTX Field training exercise.
F ty Yield strength in tension.
FTZ Foreign trade zone, secure duty-free area at airport
legally outside territory administered by local customs
authority.
FU 1 Fuel uplifted.
2 Fire unit.
3 Forecast upper wind.
FU, Fu Smoke (ICAO).
fu Fuel used.
FUA Flexible use of airspace (UK, 2004–).
FUCE Far-ultraviolet camera experiment.
fuel dipper
fudge factor Multiplying factor to allow for unknowns
(colloq.).
FUE Full unit equipped.
fuel Substance used to produce heat by chemical or
nuclear reaction; usual chemical reaction is combustion
with oxygen from atmosphere or from rocket oxidant (see
kerosene, petrol, propellent).
fuel accumulator Container for storing fuel expelled
during starting cycle to augment flow momentarily at
predetermined fuel pressure.
fuel additive Any material or substance added to a fuel
to give it some desired quality; eg tetraethyl lead added as
an anti-detonation (‘knocking’) agent.
fuel advisory departure Procedure to save fuel by holding
aircraft prior to engine start, rather than at destination
stack.
fuel-air explosive Selected liquid fuels which on warhead
impact are scattered in fine cloud of large volume alongside
target; this is then detonated (combining with
atmospheric oxygen) less than 1 s after impact with blast
effects generally greater than that of same mass of conventional
explosives.
fuel-air mixture analyser Measures piston engine air-tofuel
ratio. Chemical *** measures absorption of CO 2 by
substance such as sodium or potassium hydroxide;
physical (electro-chemical ***) measures difference in
electrical resistance between two sampling cells, one open
to air and other to exhaust.
fuel blending facility One having authority to mix hydrocarbon
fractions to produce piston or turbine fuels to
specification, with correct addititives.
fuel burn Fuel consumption.
fuel bypass Maintains fuel pressure in carburettor float
chamber of supercharged piston engine at fixed level
above carburettor air pressure.
fuel capacity Unless otherwise stated means actual
volume of tank(s), not of system, and has no relevance to
usable capacity.
fuel cell Device which converts chemical energy directly
into electricity; differs from storage battery in that
reactants are supplied at rate determined by electrical
load.
fuel chop Sudden cutoff of supply, for whatever reason.
fuel consumption Measured on volume and mass basis;
1 mpg = 0.354 km/1 (UK), 0.425 km/1 (US); 1 gal/mile =
2.825 1/km (UK), 2.353 1/km (US); including payload, 1
tonne-km l –1 = 2.868 UK ton-miles/UK gal; reciprocal is
0.348.
fuel control and monitoring computer Measures and indicates
fuel volume and mass, controls refuelling to selected
levels whilst monitoring pumps and valves, monitors and
controls tank temperatures, and controls tank utilization
sequence to minimize wing bending moment and control
c.g.
fuel control unit Governs engine fuel supply in accordance
with pilot demand, ambient conditions and engine
limitations.
fuel-cooled Cooled by fuel, either en route to engine or
recirculated back to tank (see regenerative cooling).
fuel cost Cost of fuel as proportion of total DOC, typically
[all gas-turbine aircraft] 20 to 25 per cent.
fuel cut-off Device for cutting off the supply of metered
fuel to cylinders or a combustion chamber.
fuel dipper Automatic adjustment of fuel flow to turbine
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