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filter crystal
filter crystal Quartz crystal resonator used to control
filter characteristics.
filter element Cleansing medium in filter (1) with dry
matrix or liquid (often oil) film.
filtering 1 Analysis of signal into harmonic components.
2 Separation of wanted component of time series from
unwanted residue (noise).
3 Suppression or attentuation of unwanted frequencies.
4 Cleansing of fluid flow of solid particles.
5 Process of interpreting reported information on
vehicle movements to determine probable true tracks and,
where applicable, heights or depths.
Filur Flying innovative low-observable unmanned
research.
FIM 1 Fault-isolation monitoring [or manual].
2 Field-ion microscope.
3 Full indicator movement.
FIN Functional identification [or item] number.
fin 1 Vertical or inclined fixed aerofoil, usually at rear or
on wingtip to increase directional stability.
2 Projecting flat plate to increase surface available to
reject unwanted heat.
3 Those parts of stabilizers of kite balloon providing
stability in pitch.
4 Shallow sharp-edged ridge around fixed or [more
often] rotating part of gas turbine core, which in successive
stages almost eliminates air or gas loss. The outer
radius may be sealed by oil or abradable material.
FinAF Finnish air force.
“final” Inbound to active runway, called verbally by
pilot when 4 nm from visible threshold.
final approach 1 IFR, flightpath inbound, beginning at
** fix and extending to active runway or to point where
missed-approach procedure is executed.
2 VFR, flightpath in direction of landing along
extended runway centreline from base leg to runway;
hence “on finals”.
final-approach altitude Height at start of final approach.
final-approach fix That from or over which published
final IFR approach is executed.
final-approach gate Position on extended runway
centreline above which landing aircraft is required to pass
at time assigned by approach control.
final-approach point Start of final-approach segment of
non-precision approach.
final-approach segment Final approach (1).
final assembly Assembly of major structural and subunits
which form completed aircraft; erection.
final-assembly drawing Undimensioned drawing calling
out all major installations on aircraft; complete index to
particular model or sub-type (see callout notes).
Final clearance Unambiguous authorization to V-
bomber crew to make attack with NW, also called PRM
(RAF).
final controller Radar controller employed in transmission
of PAR (previously GCA) talk-down
instructions, and in passing monitoring information to
pilots not using PAR.
final mass Mass of rocket after burnout or cutoff.
final monitor aid Program for management of parallel
runways (FAA).
final procedure turn Links base leg to approach.
finals Final approach (colloq.).
FIP
final trim Exact adjustment of ballistic missile or space
launcher to desired cutoff velocity.
fin carrier Frame laced to channel patches on aerostat
to distribute loads from fin.
Finder Acronym, flight-inserted detection expendanble
for reconnaisance.
fine adjustment Cockpit lever operating needle valve
controlling fuel flow to engine, normally operated in
conjunction with the air lever [c1908–25].
fine data channel Channel of trajectory-measuring
system delivering accurate but ambiguous data; coarse
channel resolves ambiguity.
fineness ratio Ratio of length of streamlined body to
maximum diameter, or some equivalent transverse
dimension.
fine pitch Governed propeller-blade angle most suitable
for take-off and low-speed flight, between ground fine and
range of coarser cruising settings.
fine-pitch stop Sets limit of blade rotation into fine pitch.
fin flash Rectilinear marking on fin, usually comprising
stripes in national colours.
finger See fingers.
finger-bar controller Pilot flight-control input in which
fingers rotate cylinder forward or backward for pitch
control and rock sideways for roll.
finger four See fingertip.
finger lift Finger-operated latch on front or rear of
throttle lever to prevent inadvertent selection of afterburner
or reverser.
finger patch Aerostat envelope patch having radial
‘fingers’ to distribute load into fabric.
fingers Long corridors projecting at about 90° from
airport terminal to provide sufficient length for large
number of gates.
finger-tight Assembled so that item can readily be partdismantled
or stripped; usual state of prototype engine
stored after cancellation.
fingertip Formation in which four aircraft occupy positions
suggested by fingertips of hand held horizontally,
palm down.
finger twizzle Twirl by finger signifying ‘start engines’.
fin girder Main vertical fin member in rigid airship.
finish 1 External coating or covering of aircraft or part.
2 General appraisal by eye or touch of external surface
quality of aircraft or part, esp. of all-metal construction.
finite-amplitude wave Shockwave generated at front or
rear of supersonic body of finite dimensions.
finite-displacement stick Pilot’s control column which
transmits movements (even if small) and not electrical
signals generated by force transducers.
finite-element analysis Representation of the infinite
complexity of stress in a structure by breaking it down
into small triangular cells, which can be treated mathematically.
finite wing Wing having tips, thus all real wings other
than annular.
finlet Dorsal fin.
Finnegan Exercises involving detachment of NW-armed
bomber[s] to dispersal base (RAF 1959–70).
Finrae Ferranti inertial-navigation rapid-alignment
equipment.
FINS, Fins Fixed-imagery navigation sensor (Lantirn).
FIO Fully integrated optimization.
FIP 1 Flight instruction program (AFROTC).
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