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flashing off
flashing off Drying of surface of film or finish until safe
to gentle touch.
flash lobe Sudden peak in radar signal caused by radome
[also one word].
flashover 1 Phenomenon in which material exposed to
intense radiation suddenly ignites over its entire surface.
2 Sudden discharge between conductors with very large
potential difference.
flashpoint Temperature at which vapour of substance,
such as fuel, will flash or ignite momentarily. Lower than
fire point.
flash suppressor Attachment to muzzle of gun which
reduces or eliminates visible light emitted.
flash welding Electric welding by partial resistance
welding under low pressure, heating by electric arc, and
application of large compressive pressure forcing surplus
weld out of joint.
FLAT Flight-plan aid tracking.
flat With horizontally opposed cylinders.
flatbed Transport aircraft (so far only conceptual) for
conveying ISO containers on flatbed fuselage.
flat diameter Diameter of circle enclosing canopy of flat
parachute when spread out on plane surface.
flat-Earth navigation If the vehicle speed and distance
travelled are small it is possible to ignore Coriolis and
centripetal effects.
flat four Four-cylinder, horizontally opposed piston
engine.
flat-H Piston engine with two superimposed rows of
opposed cylinders.
flathatting Flying at lowest possible safe height (US
colloq.).
flat-head rivet Thin-headed rivet used internally or
where round or countersunk heads are for any reason not
advisable.
flat pad Ship-mounted ballistic-missile launcher
isolated from ship motion (colloq.).
flat-panel instrument With LCD display.
flat parachute Parachute whose canopy consists of
triangular gores forming regular polygon when laid out
flat.
flat pitch Ground fine pitch.
flat-rated 1 Engine throttled or otherwise restricted in
output at low altitudes and thus able to give constant
predictable power at all FLs up to given limit, shown as
kink point on plot of power: altitude.
2 Engine restricted in ouput in cold ambient conditions
and thus able to give constant predictable power in all air
temperatures up to given published limit; eg * to 28.9°C.
3 Usually * combines (1) and (2). Hence, flat rating.
flat riser VTOL aircraft able to take off with fuselage
substantially horizontal (term not normally applied to
helicopters and other rotorcraft).
Flats Flight-line automatic test set (Varo).
flat sequence Display aerobatic routine imposed by low
cloudbase.
flat six Six-cylinder, horizontally opposed piston
engine.
flat spin Spin at large mean angle of attack but with
longitudinal axis of the aircraft nearly horizontal;
recovery difficult and prolonged because, with aircraft
fully stalled, ailerons, elevators and rudder are ineffective;
nose-up position and rotation carries slipstream away
flexible air-data system
from tail. Anti-spin parachute can assist positive
recovery.
flat template Representation on two-dimensional
material of dimensions, areas and other characteristics of
curved part; also known as layout template.
flattened-X Delta-3.
flattening out 1 “In alighting, the transition between the
approach glide and the horizontal motion before making
contact with the earth” (BSI).
2 Many authorities add recovery from a dive to level
flight.
flat-top Aircraft carrier (colloq.).
flat zone Zone within indicated course sector or ILS
glidepath sector in which slope of sector characteristic
curve is zero.
FLAVIR Flapless air vehicle integrated industry
research (UK).
FLB Association of airline operators (Austria).
FLC 1 Fuel and limitation(s) computer.
2 Flight-level change.
FLCH 1 Flechette(s), for piercing armour.
2 Change in flight level.
FLD Fault location device (wiring).
fld Field.
FLE Future logistics enterprise.
FLEEP Flying lunar-excursion experimental platform.
One-man rocket-powered platform intended to enable
astronaut to make quick hops on lunar surface.
fleet All aircraft of one type used by same operator.
Hence * age, * youth, average flight time of fleet.
fleet ballistic missile submarine Submarine designed to
launch ballistic missiles.
fleet carrier CV, large surface vessel equipped to launch,
recover and maintain powerful fixed-wing aircraft in any
theatre.
fleet leader Aircraft in [usually airline] fleet having
greatest flight time.
fleet noise level Average noise level throughout fleet.
fleet performance monitoring Confidential use of quickaccess
recorders to inspect actual way pilots fly [airline]
aircraft, and in particular whether airspeeds, rates of
descent, etc, are within limits.
Flem Fly-by landing excursion mode.
Flettner Aileron tab.
Flettner control See servo tab.
Flettner rotor Cylinder spinning on axis normal to
airstream, generating transverse thrust/lift. In theory
could provide both lift and thrust, but no successful *
aircraft has been flown.
FLEX Flexible takeoff.
Flexadyne Proprietary (Rocketdyne) formulation of
solid propellant.
Flexar Flexible adaptive radar.
flexbeam Torsionally compliant spar, typically of
CFRP laminates, attaching helicopter rotor blade to hub
and flexing to accommodate varying blade pitch and
coning angles.
flexibility Ability of hardware, including aircraft, to
operate efficiently over wide range of conditions; eg long
or short sectors, high or low level.
flexibility factor Used in helicopter rotor stress calculations
to make up for structure’s flexibility.
flexible air-data system Versatile microprocessor-based
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