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field training detachment
field training detachment Established to provide maintenance-orientated
technical training, at operational
location, on new systems and their aerospace ground
equipment (USAF).
FIES Factor of initial engine spares.
FIF Fluorescent inspection fluid.
f IF Intermediate frequency (superhet. receiver).
FIFO 1 Fail-isolated/fail-operative.
2 First in, first out.
FIFOR, Fifor Flight forecast (Int.).
15-m class Most restrictive of the Ostiv/FAI classes for
competitive gliding, including span not greater than 15m
(49 ft 2 in).
15-3-3-3 Alloy 76 Ti, 15 Va, 3 each Al, Cr, Sn.
fifth-freedom traffic Picked up by airline of country A
from country B and flown to country C (see freedoms).
fifth wheel Vehicle [e.g., baggage trolley] steering by
pivoted full-width axle.
FIG 1 Fighter interceptor group.
2 Flight-idle gate.
fighter Aircraft designed primarily to intercept and
destroy other aircraft.
fighter affiliation Training exercise carried out by
bombers, other heavy aircraft, ground or naval forces, in
co-operation with fighters.
fighter-bomber Fighter able to carry air-to-surface
weapons for ground attack and interdiction.
fighter controller Officer on staff of tactical air
controller charged with co-ordination and evaluation of
air warning reports and operational control of aircraft
allocated to him. Also known as fighter director (see also
air controller, tactical air controller, tactical air director).
fighter cover Patrol of fighter aircraft over specified area
or force for purpose of repelling hostile aircraft.
fighter-direction aircraft Equipped and manned for
directing fighter operations.
fighter escort Force of fighters detailed to protect other
aircraft from attack by enemy aircraft.
fighter sweep Offensive mission by fighter aircraft to
seek out and destroy enemy aircraft or targets of opportunity
in allotted area.
Fighting Area A nominated area including south-east
England (1925–36). Became part of RAF Fighter
Command.
fighting harness Seat harness [fighter and similar a/c
1920s].
fighting kite Used in sport [originally China] in which
objective is to cut rival’s control cords.
fighting top Cockpit box for gunner(s) on upper wing of
large early bombers, accessed by ladder from fuselage.
fighting wing Combat formation which allows wingman
to provide optimum coverage and maintain manoeuvrability
during max-performance manoeuvres.
FIGS, Figs Formation integrated gateway subsystem.
Integrates radars, com. and airport systems gateways with
VME-bus and LAN connections.
figure 8 fuselage See double-bubble.
Figure-9 loop Self-explanatory, aircraft progressively
reducing [vertical-plane] turn radius to describe a 9.
Figure of 8 Self-explanatory manoeuvre in the horizontal
plane, in many countries required for A-licence.
figure of merit 1 Single numerical value describing
quality of real system as percentage or decimal fraction of
ideal or theoretical ideal.
filter centre
2 In particular, helicopter ideal hover power divided by
actual.
FIH Flight information handbook.
FIJPAé Fédération Internationale des Journalistes
Professionels de l’Aéronautique.
FIKI Flight into known icing.
FIL Fountain-induced lift.
FILA, Fila Fighting intruder[s] at low altitude.
Filac Federazione Italiana Lavoratori Aviazione Civile.
filament winding Manufacture of pressure vessel (eg
rocket-motor case) by winding continous high-strength
filament on mandrel, bonded by adhesive.
File Feature identification and location element
(OSTA).
filed flightplan That filed by pilot or his designated
representative, without any subsequent changes.
FILG Filling.
fill, filling Threads in fabric which run perpendicular to
selvage; weft.
fillers 1 Paste or liquid used for filling pores of wood
prior to applyng paint or varnish.
2 Pulse pairs generated by random noise in unsaturated
DME beacon to maintain 2,700/s.
fillet 1 Aerodynamic fairing giving radius at junction of
two surfaces, especially wing trailing edge and fuselage or
hull.
2 Fill which traditional weld makes at intersection of
two parts.
3 Increased area of pavement at junctions of taxiways
and runways to facilitate high-speed turn-offs and other
manoeuvres.
filling Increase in pressure in centre of low (meteorological);
opposite of deepening.
filling sleeve See inflation sleeve.
film chip One incorporating thin or thick-film technology.
film cooling Cooling of body by maintaining thin fluid
(liquid, vapour or gas) layer over surface.
filmed IIT coated with ion-barrier film to prevent feedback
damaging delicate photocathode.
film-return satellite Reconnaissance satellite which
[possibly in a constellation of sensors] includes a camera
using physical film, returned to Earth.
Filour Flying innovative low-observable unmanned
research.
FILS, Fils Fault-isolation and location system,
integrates Bite with other systems.
FILT Federazione Italiana Lavoratori Trasporti [trade
union; office, I-00161 Rome] (Italy).
filter 1 See centrifuge *, momentum separation *,
dynamic particle *.
2 Capacitance and/or inductance and resistance
designed to pass given band of RF only. High-pass, lowpass,
band-pass and band-stop * pass frequencies
respectively above, below, between and outside desired
frequencies. Frequencies at which attentuation falls by
more than 3 dB are termed cut-off frequencies.
3 To study air warning information and eliminate any
not of interest.
filter centre Location in aircraft control and warning
system at which information from observation posts is
filtered (3) for further dissemination to air-defence
control and direction centres (DoD).
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