the Aviation Dictionary

filiform corrosion final approach fix (FAF)
filiform corrosion - A thread- or filament-like film strength - A lubricant's abilitv to maintain a
corrosion that forms on aluminum skins beneath a continuous lubricating film under mechanical pressure
covering of protective coating.
without breaking down
fill -The direction across the width of fabric. filter 1. A device fbr straining out unwanted solid
particles in a fluid. 2. An electrical circuit arranged to
fill threads - Threads running across the width of a
pass certain frequencies while blocking all others. A
piece of fabric from one selvage edge to the other. Also
high pass filter passes high frequencies and blocks low
referred to as weft or woof threads.
frequencies.
filler - In composites, material added to the mixed resin
filter capacitor - A low-impedance capacitor attached
to increase viscosity, improve appearance, and lower
across the output of a DC power supply to filter any
the density and cost.
ripple to ground, leaving the DC untouched.
filler material - Any material mixed or added to a base
filter choke - An inductor placed in series with the
material in order to give body to the base material.
output of a DC power supply to reduce the amount of
filler metal - A metal used to increase the area of a ripple while allowing the DC to pass.
weld. Normally supplied in the form of the welding rod
filtering - The separation of unwanted components from
or the electrode used in arc welding.
either a fluid flow or an electrical flow.
neck - a c~linder-sha~ed neck Or tube
fin - 1. The
of an airplane to which the
leading into a reservoir for replenishing fluids.
rudder is hinged. It produces directional stability. 2. A
filler plug - The plug installed in a sheet metal or wood key under the head of a fastener that serves to keep the
structural repair to make the surface of the repair fastener from turning during assembly and use.
coincide with the original skin contour. The filler plug
final - Commonly used to mean that an aircraft is on the
is used only to make the surface aerodynamically
tinal approach course or is aligned with a landing area.
smooth. The strength of the repair comes from the
(See Final Approach Course) (See Final Approach -
doubler inside the structure.
IFR) (See Traffic Pattern) (See Segments of an
filler ply - In composites, an additional patch to fill in a Instrument Approach Procedure)
depression in the repair, or to buildup an edge.
final approach - A flight path of a landing aircraft in
filler rod - A thin metal rod or wire used in welding to the direction of landing along the extended runway
provide the necessary filler metal. Used to provide centerline from the base leg or straight in to the
additional strength to the weld.
runway.
filler valve - A readily accessible valve that provides a
means of servicing an installed oxygen, air, or fluid
system.
fillet - A rounded-out addition at the intersection of two
plane surfaces to produce a smooth junction where the
two surfaces meet. Fillets produce a smooth
aerodynamic junction between the wing and the
fuselagc of an airplane.
filling - An increase in the central pressure of a pressure
system: opposite of deepening: more commonly
applied to a low rather than a high.
fillistcr-head screw - A machine screw whose shape
consists of a rounded top surface, cylindrical sides, and
a tlat bearing surface.
film adhesive - In composites, a synthetic resin
adhesive. usually of the thermosetting type, in the form
of a thin, dry film of resin.
film resistor - A rcsistor formed by coating a ceramic,
glass, or other insulating cylinder with a metal oxide or
other thin resistive film.
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final approach - IFR (USA) - The flight path of an
aircraft which is inbound to an airport on a final
instrument approach course, beginning at the final
approach fix bi point and extending to the airport or the
point where a circle-to-land maneuver or a missed
approach is executed.
final approach (ICAO) - That part of an instrument
approach procedure which commences at the specified
final approach fix or point, or where such a fix or point
is not specified, 1. at the end of the last procedure turn,
base turn or inbound turn of a racetrack procedure, if
specified; or 2. at the point of interception of the last
track specified in the approach procedure; and ends at a
point in the vicinity of an aerodrome from which: a. a
landing can be made; or b. a missed approach
procedure is initiated.
final approach course - A bearingIradialitrack of an
instrument approach leading to a runway or an
extended runway centerline all without regard to
distance.
final approach fix (FAF) -The fix from which the final
approach (IFR) to an airport is executed and which
identifies the beginning of the final approach segment.
It is designated in the profile view of Jeppesen