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Fodcom
Fodcom Flight Operations Department communication,
issued as necessary (CAA).
FODCS Fibre-optic[s] digital control system.
FODMS Fibre-optic[s] data multiplex system.
FOD plod Duty of removing from taxiways and
runways anything that might cause FOD.
F/ODS, Fods Fire/overheat detection system.
FODT Fibre-optic[s] data transmission.
FOES Fibre-optic engine sensor.
FOFA Follow-on forces attack.
FO/FO Flame-on/flame-out.
FOF3 Flag Officer 3rd Flotilla, responsible for all naval
aviation (UK, RN).
FOG 1 Fibre-optic[s] guidance.
2 Fibre-optic[s] gyro.
3 Flight-operations group (RAeS).
fog 1 Form of cloud in surface layers of atmosphere
caused by suspended particles of condensed moisture or
smoke, reducing visibility to less than 1 km. Advection *
results from arrival of warm humid air over cold surface;
radiation * from cooling of water vapour created by evaporation
during day by cold ground on clear night; sea * by
condensation of moisture in warm air over cold sea
(essentially advection).
2 See cabin *.
Foglite Finding obscured ground targets using laser
imaging of the target environment (USAF + industry).
FOG-M, Fog-M Fibre-optic[s], guided missile (USA).
fog of war Notional idea invented to explain ‘own goals’
in recent conflicts (US).
FOHE Fuel/oil heat exchanger.
Föhn, foehn Dry wind with strong downward component,
warm for season, characteristic of mountainous
regions.
FOI 1 Follow-on interceptor (USAF).
2 Totalförsvarets Forskningsinstitut [defence/
aerospace research, Sweden].
3 Flight Operations Inspectorate (CAA).
FOIA Freedom of Information Act (US).
foil 1 Lifting surface of hydrofoil landing gear.
2 Spanwise trailing-edge members, one upper and one
lower, forming integral part of compound wing.
FoIP Fax over Internet Protocol.
FOL 1 Forward operating location.
2 First-order logic.
fold Joint in wing of carrier aircraft enabling it to be
folded. Incorporates one or more horizontal, skewed or
vertical hinges.
folded combustor Gas-turbine annular combustion
chamber in which, to reduce engine overall length, the
flow makes two 180° turns, leaving at a reduced chamber
diameter to match high-speed turbine.
folded dipole Two parallel, closely spaced dipole
antennas connected at ends, with one fed at centre.
folded fell seam Fabric seam which has both edges
folded and located in same place between fabric layers.
folding fin 1 Aircraft or missile fin hinged axially at base
to lie flat prior to launch.
2 Rocket or missile fin hinged transversely to emerge
from housing slot, as in FFAR.
folding wing One hinged outboard of root to enable
overall dimensions to be reduced when aircraft must enter
hangar, esp. on carrier.
foliage penetration Fopen, challenging objective of wide
Foracs
range of EM-radiating systems, especially with MTI;
other acronyms Lobstar, TUT.
follow-on Anything considered to be second or subsequent
generation in development, esp. within same
manufacturing team.
follow-on contract One whose terms repeat those for
earlier stage of same programme.
follow-on development tests Tests during acquisition
phase after completion of formal Cat II tests; consist of
updating changes or additions not available previously
(USAF).
follow-on production Serial production immediately
subsequent to completion of development or previous
production batch.
Folta Forward operating location training area.
FOM 1 Figure of merit.
2 Federation object model [simulation].
FOMA Flag Officer Maritime Aviation (UK).
FOMC Fibre-optic micro-cable.
FONA Flag Officer, Naval Aviation (UK).
Fonda Future optical network distribution for aerospace
(AgWestland).
fone Telephone (FAA).
Foo fighters UFOs (US, 1946–60).
FOO Forward observation officer (FAC2).
3 Area covered by airline route network [generally relevant
to hub/spoke and smiliar regional carriers].
FOOS Fail-operational, fail-operational, fail-safe.
foot Non-SI unit of length, = 0.3048 m by definition.
foot-candle Non-SI unit of luminance = 1 lm/sq ft =
10.76 lux.
foot-lambert See lambert.
foot-launched Micro or powered parachute strapped to
pilot’s back.
foot motor Foot-operated hydraulic motor used to
energise wheel brakes.
foot-pound Unit of work or energy, = 1.35582 J.
foot-poundal Unit of work or energy, = 0.042140 J.
foot-pound-second system Non-SI system of units still
used in US; also called Imperial.
footprint 1 Area around airport enclosed by selected
contour for LPN, EPNL, NNI or other noise measure.
2 Possible recovery area for spacecraft plotted from reentry
point.
3 Area covered by airline route network [generally relevant
to hub/spoke and similar regional carriers].
foot-thumper Stall-warning device that triggers
oscillating plunger in rudder pedal when stall imminent.
foot-to-head acceleration Ambiguous, means accelerating
force acting on body from head to feet, negative g.
footwell Recess in outer skin of [usually combat]
aircraft, often covered by spring-loaded flap, to enable
crew to board without ladder.
FOP 1 Forward operating paid.
2 Fired outside parameters.
Fopen Foliage penetration, or penetrating (SAR, TUT).
FOQA Fleet [airline] or flight-operations, or operational,
quality assurance (FAA).
FOQNH Forecast regional QNH.
FOR 1 Fail-operative redundant.
2 Field of regard.
Foracs Fleet operational readiness and calibration
system.
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