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frontolysis
atmosphere or increases intensity of existing front, generally
caused by horizontal convergence of air currents
possessing widely different properties.
frontolysis Process which tends to weaken or destroy a
front.
front stagnation point See forward stagnation point.
Fropa Frontal passage.
Frost Fast read-out optical storage technology.
frost Small drops of dew which freeze upon contact with
object colder than 0°C such as aircraft passing from cold
air into warmer humid air. Glazed * (rain ice) is layer of
smooth ice formed by rain falling on object at below 0°C.
Hoar * is white semi-crystalline coating.
frost point Temperature of air at which frost forms on
solid surface at same temperature.
Froude efficiency Basic element of propulsive efficiency:
–––––
2U
where U is TAS and V is velocity of propulsive jet
V+U
or propeller slipstream relative to the aircraft.
Froude number Non-dimensional ratio of inertial force
to force of gravity for fluid flow; reciprocal of Reech
number; Nfr
= v 2 /lg, where v is characteristic velocity and
1 characteristic length (may be given as square root of this
ratio).
frozen No further design changes permitted.
frozen smoke Acoustic/thermal insulation [colloq.
airogel said to be lowest-density semi-rigid material, able
to support 10 3 × own mass].
frozen stick Terrifying situation in which pilot cannot
overcome stick force needed to recover from steep dive.
FRP 1 Fibre-reinforced plastic[s] or plywood.
2 Flight-refuelling probe.
3 Fuselage replacement programme.
4 Federal radio navigational plan.
5 Fares and Rates Panel.
6 Full-rate production.
7 Fleet response plan.
FRPA Fixed reception pattern antenna.
FRPC Federal Research and Production Centre,
[English rendition] (R).
FRQ Frequent, frequency.
FRR 1 Flight-readiness review.
2 Final readiness review.
FRS 1 Fan rotation speed (N 1 ).
2 Fighter, reconnaissance, strike (role prefix, UK).
3 Fleet Replacement Squadron (USN, USMC).
4 Flying Refresher School (RAF).
5 Field Repair Squadron (RAF).
6 Flammability reduction system.
7 Flight reconstruction system (FOQA).
FRSI Flexible reusable silica, or surface, insulation.
FRST Frost.
FRTO Flight radio-telephony operator.
FRTOL 1 Flight radio temporary operating license.
2 Flight R/T operator licence (UK).
FRTV Forward repair and test vehicle.
FRU 1 Forward Repair Unit (RAF).
2 Fleet Requirements Unit (RN).
fruiting SSR responses of aircraft to interrogation by
other stations or responses of different aircraft to interrogation
by other stations, in either case not synchronized
with desired response by aircraft interrogated by own
station; hence defruiting usually simple.
FSDG
fruit salad Impressive rows of medal ribbons (UK,
colloq.).
FRUSA Flexible rolled-up solar array.
FrW Friction welding.
FRWD Fast-reaction weapons demonstration.
FRZ 1 Freeze (information or display).
2 Flight Restricted Zone [e.g. within 15 n.m. of
Washington Reagan] (FAA).
FS 1 Fuselage station.
2 Frame station.
3 Fail-safe.
4 Fighter Squadron.
5 Front spar [often F.S.].
6 Flight simulator.
7 Feasibility study.
8 Full-supercharge gear.
9 Factor[s] of safety.
10 French standard [approach lighting].
Fs Fractostratus.
f s 1 Signal frequency.
2 Shear stress [up to near u.t.s.].
f/s Not acceptable for ft/s.
FSA 1 Final squint angle.
2 Force-structure aircraft (US).
3 Fuel-savings advisory; S adds system and see
FSA/CAS.
4 Frequency-spectrum availability.
5 Future strike aircraft (USAF).
6 Flight-spoiler assembly.
FSAA Flight simulator for advanced aircraft (NASA).
FSA/CAS FSA (3) cockpit avionics system.
FSAF Future surface-to-air family (title often in
French) (Int.).
FSAGA First sortie after ground alert.
FSAS 1 Fuel-savings advisory system.
2 Flight-service automation system.
FSAT 1 Full-scale aerial target.
2 Federal service of air transport (R).
FSB 1 Fan-stream burning.
2 Fasten seat-belts.
3 Flight Standardization Board (US).
4 Federal security service (R).
FSC 1 Force-sensing control[ler].
2 Fuel-saving[s] computer.
3 Forward shaped-charge warhead.
4 Flight Safety Committee (UK).
5 Flight-safety critical.
FSCC Flap/slat control computer[s].
FSCL Fire-support co-ordinating line.
FSCM Federal supplier [or supply] code of manufacturer,
or for manufacturers (US).
FSCP Flap/slat control processor.
FSCRS Flight-safety confidential reporting system [not
same as Chirp].
FSCTE Fire Service Central Training Establishment
(UK).
FSD 1 Full-scale deflection.
2 Full-scale development.
3 Federal Security Director (TSA).
4 Full-spectrum dominance.
5 Flying scholarships for the disabled.
6 Specification prefix for aero gas turbine fuels and
lubricants (Sweden).
FSDG Fan-shaft-driven generator.
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