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flamestat
flamestat Sensor detecting abnormal high temperature
in a [e.g. air conditioning] duct.
flame trap Filter in piston engine induction system to
prevent passage of flame upstream after blow-back or
backfire.
flame tube 1 Perforated tube designed for mixing of fuel
and air, in which fuel is burnt in gas turbine; usually
inserted as inner liner in combustion chamber for diluting
and cooling flame (UK).
2 Interconnector between combustors or between afterburner
gutters (US).
Flan Flying/floating local-area network.
flanging machine Metal-forming machine with highspeed
plunger which bends up successive small portions of
flange on moving workpiece.
flank 1 Lower side of fuselage or other aerodynamic
body.
2 Sides of lower (inner radius) end of compressor or
turbine blade.
FLAP Frankfurt, London, Amsterdam, Paris.
flap 1 Movable surface forming part of leading or
trailing edge of aerofoil, esp. of wing, able to hinge downwards,
swing down and forwards, translate aft on tracks
or in some other way alter wing camber, cross-section and
area in order to exert powerful effect on low-speed lift and
drag. See following types: double-slotted, dive-recovery,
Fowler, Gouge, Junkers, Krüger, leading edge, manoeuvre,
plain, slotted, split, triple-slotted, Youngman and Zapp.
2 Side walls of thrust-augmenting ejector in poweredlift
system, in fighters part of a retractable structure.
3 Hinged segment forming part of primary or
secondary nozzle of afterburner.
4 Urgent activity (UK colloq.).
flap angle Angle between chord of flap and that of wing.
flap blowing Discharge of HP compressor bleed air over
lowered flaps to prevent airflow breakaway. Normally air
issues at about sonic speed through slit facing across flap
upper surface, flow attaching to flap through Coanda
effect. Also called Attinello flap (see BLC, super-circulation).
flaperon Surface combining roll-control function of
aileron with increased lift and drag function of flap; can
be differentially operated.
flap fan Experimental concept in which flaps carry small
fans driven by engine bleed air (perhaps eight fans on each
flap) to maintain attachment and provide powered lift.
flaplet 1 Loosely, any small flap.
2 Narrow-chord flap with circular-arc LE and flat
top/bottom forming TE of Coanda CCW.
flappery Flaps, especially if prominent on Stol aircraft
(colloq).
flapping Angular oscillation of helicopter rotor blade
about flapping hinge.
flapping angle Angle between tip-path plane and plane
normal to axis.
flapping hinge Sensibly horizontal pivot on helicopter
main-rotor hub which allows blade tip to rise and fall.
flapping plane Plane normal to plane of each flapping
hinge axis.
flap-retraction-height Variable but always over 1,000 ft
(305 m) with aircraft at or above FUSS.
Flaps 1 Force-level automated planning experiment
(AAFCE).
2 Flat-aperture parabolic surface (antenna or mirror).
flashing light
flap setting Predetermined angle of flap (1) for takeoff,
landing or other flight condition.
flaps-extended speed The highest speed permissible with
flaps in a prescribed extended position.
flaps-up safety speed Minimum TAS at which aircraft
maintains positive ROC with flaps retracted.
flap-type control The common type of flight control
surface.
FLAR Federatsii Lyubitelei Aviatsii Rossii, Federation
of aviation amateurs (R).
Flair Fixed low-altitude intermediate-range, surveillance
radar.
flare 1 Noun and verb, final nose-up pitch of landing
aeroplane to reduce rate of descent close to zero at touchdown.
It starts at the point of departure from the
glideslope.
2 Distance sides of planing bottom of marine float or
hull flare out from centreline.
3 Pyrotechnic aerial device for signalling or illumination;
parachute * illuminates large area when released at
altitude; wingtip * illuminates ground when landing.
4 Inverse taper (ie opening out) at tail of cylindrical
body, as at base of rocket vehicle.
5 Eruptions from Sun’s chromosphere, which may
appear within minutes and fade within an hour; eject highenergy
protons, cause radio fadeouts and magnetic
disturbances on Earth.
6 Fixed source of ground or water illumination, of
several types, usually burning kerosene or related fuel
(generally obs.).
flare-augmentation system Electronic feedback on fixedwing
STOL to achieve minimum landing field length.
flare demand Coded Autoland signal commanding flare
(1).
flare dud Nuclear weapon which detonates with anticipated
yield but at altitude appreciably greater than
intended; a dud in its effects on target (DoD).
flare out See flare (1).
flare path 1 Line of flares (6) or lights down one side or
both sides of runway to provide illumination (generally
obs.).
2 In the modern world this means the trajectory
described in a landing flare 1.
flare-path dinghy Attends flare path laid over water for
marine aircraft.
Flash 1 Folding lightweight acoustic sonar [or system]
for helicopter.
2 Flying laser self-defence system against seeker-head
missiles.
flash 1 Basically rectangular pattern of vertical bars in
national colours painted on military aircraft, usually
covering portion of fin.
2 White semicircular or circular badge worn in headgear
of aircrew cadet.
flashback Sudden upstream travel of flame in flow of
combustible mixture in enclosed system.
flash/bang/smoke Signifies training target disabled.
flash burn Caused by radiation from nuclear explosion.
flasher unit Regular make/break switch in circuit of light
which flashes rather than rotates.
flashing light Intermittent aeronautical surface light in
which light periods are clearly shorter than dark, with
repeated cycle. Usually has published frequency.
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