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FLID
DADC outputting MIL-1553B, Arinc 429, analog and
IFF transponder.
flexible blade 1 Helicopter rotor blade with trailing-edge
or balance tabs.
2 Helicopter rotor blade in which pivots are replaced by
flexible structure.
flexible elastomer skin Reduces RCS by hiding joints
and discontinuities.
flexible flight deck Post-WW2 concept of aircraft carrier
whose aircraft would need no landing gear.
flexible gun Clearly a nonsensical idea: what is meant is
pivoted, ball-mounted or in any other way manually
aimed independently of the aircraft.
flexible takeoff, FTO Takeoff technique in which for
TOW below MTOW, less than maximum engine thrust is
selected. For given WAT condition, this thrust is
computed by intersection of TOW and aircraft performance
to comply with regulations, giving a theoretical
“ambient temperature” Tf. Thrust selected is that which
would be available at full power at Tf. FTO saves engine
costs, reduces noise and extends engine life.
flexible tank Bag-type tank.
flexible [flex] targeting Mission is launched by local
commander with choice of targets and weapons to attack
suddenly seen target.
flexible wall Used in wind tunnels, engine air inlets and
other ducts subject to large range of flow and Mach
number; may be perforated to extract boundary layer.
Flex-tracks The first step towards complete userpreferred
routing, available [2006] on a trial basis over
routes from Australia to Asia, and the US Pacific coast.
flexural axis Locus of flexural centres, points at which
applied load produces pure bending without twist (note,
on swept wing pure bending results in apparent twist, ie
loss of incidence).
flexural wash-out Apparent reduction in angle of incidence
from root to tip as swept wing deflects upward
under load.
flexure Bending under load.
flex-wing Foldable or collapsible single-surface wing for
micro or hang glider.
FLG 1 Flashing light.
2 Falling (also Flg).
FLI 1 Fighter lead-in.
2 First-limit indicator.
flicker Subjective sensation resulting from periodic fluctuation
in intensity of light at rates less than about 25/30
times a second, preventing complete continuity of images.
flicker control See bang-bang control.
flicker marking Various black-white schemes to render
rotating propeller blades more visible on ground.
flicker rate Refresh rate for CRT information below
which flicker becomes noticeable; dependent on eye’s
persistence of vision and persistence of CRT phosphor.
flicker vertigo Caused by light occulting (flickering) at
frequencies from four to 20 per second (eg with singlepropeller
aircraft headed towards Sun at low rpm),
producing nausea, dizziness or unconsciousness.
flick roll 1 Essentially a horizontal spin, made by
slowing to spin-entry speed with engine throttled back
and then applying hard back stick and full rudder. Result
should be a controlled very rapid 360° roll.
2 “A rapidly executed roll” (B.S., 1940).
FLID Flight identification.
flight coupon
Flidras Flight-data relay and analysis system.
flight 1 Movement of object through atmosphere or
space sustained by aerodynamic, aerostatic or reaction
forces, or by orbital speed.
2 An instance of such movement.
3 Specified group of aircraft engaged in common
mission.
4 Basic tactical unit of three or four aircraft.
5 Flight sergeant (colloq., abb.).
6 Radio call sign, Flight Directory (NASA).
7 Particular scheduled air-carrier service, with three or
four-figure identifying numbers, either routinely or on
particular day.
8 Fighting formation comprising two elements each of
two aircraft (US, 1981 onwards).
flight advisory Message giving advice or information
broadcast to airborne aircraft or interested ground
stations.
flight assist Provision of maximum assistance to aircraft
lost or in distress by flight-service stations, towers and
centres (US).
flight attitude 1 Defined by inclination of three vehicle
axes to relative wind.
2 Defined relative to Earth, ie local vertical.
flight augmentation computer Main AFCS component
providing yaw damping, pitch trim and flight-envelope
monitoring and protection.
flight bag 1 For personal equipment of flight crew
member.
2 Hang-glider body bag.
flightboard Rigid sheet, at least A4 size with reinforced
corners, on which can be displayed flight information,
quick-erase writing panel and many other items.
flight cap Legally imposed arbitrary limit on number of
flights (arrivals or departures) at airport, either
throughout year or between particular [night] hours.
flight case Superseding pilot case to describe large [soft
or rigid] briefcase.
flight characteristic Feature of handling, feel or performance
exhibited by aircraft type or individual
example.
flight check Callsign prefix for navaid or other
calibration/inspection (FAA).
flight compartment See flight deck (1).
flight computer Computer (2).
flight control Specifically, control of trajectory.
flight-control data concentrator Transmits info, such as
control-surface position, to FDIU and displays, indicates
failure status to FWCs and displays, and memorizes failures
for central maintenance computer.
flight-control primary computer In charge of generating
control laws and controlling surfaces.
flight controls Those governing trajectory of aircraft in
flight.
flight-control secondary computer Controls flightcontrol
power system, spoilers and rudder trim and limits;
if FCPC fails, also takes over Elac and yaw damper.
flight control system See control system.
flight control unit Primary flight-deck interface with
AFCS providing autopilot modes, SPD/MACH, HDG
SEL, ALT SEL and similar functions; some include
autothrust.
flight coupon Actual ticket or ticket book issued by air
carrier to passenger.
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