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forming
three baseline factors determing whether a new hardware
item can immediately replace its predecessor in a functioning
system.
forming Forcing flat material to assume desired
contours and curves, esp. compound curvatures, by such
means as drop hammer, flanging machine, hydraulic
press, stretch press, hand forming etc.
forming roll Bends sheet metal into cylinders of various
diameters and other single-curvature shapes.
Form 700 In many English-speaking air forces, document
signed by captain on taking over aircraft to signify
that he is satisfied that every pre-flight maintenance
inspection has been completed.
formula costs Direct operating costs for transport
aircraft as calculated to ATA formula, which assumes
indirect costs as 100 per cent of direct and standardized
values for passenger, freight and mail revenues.
Formula 1 Air-racing rules, laid down by FARA, for
uniform class of racers (includes engine not over 200 cubic
inches, wing not less than 66 square feet, empty weight not
less than 500 lb, fixed landing gear and carefully defined
cockpit/windshield geometry).
Formula V Lightweight FARA class with VW-derived
engines.
FORS 1 Foreign airlines representatives (Sweden).
2 Fibre-optic rate sensor.
Forte Fast on-orbit recording of transient events.
Fortran Formula translator; computer language.
Forty-five line Trajectory at 45° to horizontal, flown in
either direction, thus up-* line and down-* line (advanced
aerobatics).
forward aeromedical evacuation Provides airlift for
patients between battlefield and initial and subsequent
points of treatment within combat zone.
forward air controller Member of tactical air control
party who, from forward ground or airborne position,
controls aircraft engaged in close air support of ground
troops (DoD).
forward air control post Mobile tactical air control radar
used to extend coverage and control in forward combat
area.
forward compatibility The degree to which a device or
system will meet future legislation or be compatible with
future development.
forward lock Prevents selection of reverser except after
landing; disabled by oleo deflection or, if possible, bogiebeam
tilt.
forward oblique Oblique photograph of terrain directly
ahead.
forward operating base Airfield used indefinitely to
support tactical operations without establishing full
support facilities.
forward operating location Forward operating base.
forward path In a functioning system, the path from
demand to output.
forward scatter Scattering of radiant energy into hemisphere
of space bounded by plane normal to incident
radiation and lying on side toward which radiation was
advancing; opposite of backward scatter.
forward slip See sideslip.
forward speed Component of speed in horizontal plane.
forward stagnation point Point on leading edge of body
in airstream which marks demarcation for airflow on
either side; boundary-layer air is stationary.
Fourier series
forward supply point En route or turnaround station at
which selected aircraft spares are prepositioned for
support of assigned mission(s).
forward sweep Opposite of sweepback, wing tips being
further forward than roots.
forward tilt Of helicopter rotor, forward angular
deviation of locus of centroid of blade sections from plane
of rotation.
forward tilt wing See slew-wing aeroplane.
FOS 1 Fail-operational, fail-safe.
2 Faint-object spectrograph.
3 Fibre-optics sensor (or sensing, or system).
4 Family of systems.
5 Fleet operations standards.
6 Forward observer system.
FOSA Fondation des Oeuvres Sociales de l’Air (F).
FOSC Fibre-optic satellite communications.
FOSI 1 Formatting output specifications instance.
2 Family of systems integration, or integrator (AFRL).
FOSON Follow-on stand-off weapon.
FOSS, Foss Fibre-optic sensor, or sensing, systems.
FOST Flag Officer, Sea Training.
foster parent Company contracted to provide service
support, possibly extending to major modification and
update, for an imported type of military aircraft.
FOT 1 Frequency of optimum transmission.
2 Fibre-optic twister for making inverted image
upright.
3 Flight-operations Telex.
4 Follow-on operational test (USAF).
5 Future-oriented technologies.
FOT&E Follow-on test and evaluation (continues after
entry to service, USAF).
FOT&FOE Inserts final operational.
FOTD Fibre-optic towed decoy.
FOTM Flight operations training manager.
fouling Unwanted deposition on points of piston engine
spark plug.
fount Range of characters for electronic display.
fountain Vertical rising column of hot air, usually plus
entrained debris, formed by jets of VTO jet aircraft
hovering at low level; on impact with fuselage can exert
undesired suckdown effect; alternatively, can be made to
increase lift.
fountain sheet Vertically rising wall between adjacent
jets in hovering VTO.
four-bank eight Flight training manoeuvre similar to
figure of eight except that outer portions of loops are not
circular but consist of two 45° turns linked by short,
straight flightpath.
four-course beacon See radio range.
4-D 3-D plus time, usually latitude, longtitude, altitude
and time.
4-D R-nav Terminal guidance sufficiently accurate to
put arrival’s wheels on runway within guaranteed window
of ±10s.
four greens Gear locked down and landing flap setting.
Fourier expansion Expansion of waveform or other
oscillation in terms of fundamental and harmonics.
Fourier integral Representation of (x) for all values of x
in terms of infinite integrals.
Fourier series Representation of function f(x) in interval
(– L, L) by series consisting of sines and cosines with
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