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enough magnetism, when the generator is not operating, to start the generator producing current. This
magnetism is called residual magnetism.
field maintenance (aircraft maintenance). Maintenance performed on an aircraft when it is away from its
regular maintenance base or out of the maintenance dock. Field maintenance is limited, as much as possible,
to minor replacement operations.
field strength meter (electrical measuring device). An electrical instrument used to measure the strength
of the electromagnetic field radiated from a radio transmitting antenna.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 243
filament (electron tube component). The heater in an electron tube. The filament is a small piece of flat
resistance wire mounted inside a tube-like cathode.
Electrons flowing through the filament cause it to glow red-hot, and this heats the cathode. The
heat speeds up the molecular movement in the cathode enough that electrons are emitted from its surface.
Electron tube filaments are heated with low-voltage AC or with low-voltage batteries.
file (metal-cutting tool). A hand-held cutting tool used to remove a small amount of metal by pushing the
tool across the metal surface. A file is made of very hard, high-carbon steel, and has rows of teeth cut
across its face at an angle to the length of the file.
Files with a single set of teeth are called single-cut files, and a file having a second set of teeth that
cross the first set is called a double-cut file. The teeth on a file vary from very fine to coarse. A file with the
finest teeth is said to have a dead-smooth cut; next in coarseness is a smooth cut, then a second cut, a
bastard cut, and finally a coarse cut.
filed enroute delay (air traffic control). A preplanned delay at points along the route of a flight which
requires special flight plan filing and handling techniques.
Filed enroute delays may be terminal area delays, special use airspace delays, or aerial refueling
delays.
filiform corrosion. A thread-, or filament-like corrosion which forms on aluminum skins beneath a dense
paint film. Filiform corrosion gets its name from the fact that it grows in shape of a thread, or a filament.
filler material (plastic resin component). A material mixed into a plastic resin to give body to the resin.
Powdered chalk and microballoons are two commonly used filler materials.
filler neck (fluid reservoir component). A cylindrical tube extending from a fluid reservoir to a location
that is convenient to fill the reservoir. Some hydraulic reservoirs and fuel tanks are installed inside an
aircraft structure in a location where servicing is difficult. A filler neck is installed on these reservoirs to
allow them to be filled from outside the aircraft.
filler plug (flush-skin repair component). A plug of sheet metal installed in a flush-skin repair to bring
the surface of the repair even with the skin being repaired. The strength of the repair is in the doubler inside
the structure, and the filler plug is used only to make the surface aerodynamically smooth.
filler rods (welding). Long pieces of wire that are melted into a weld to provide additional material to
strengthen the weld. Filler rods are usually called welding rods.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 244
filler valve (oxygen system component). A valve in an oxygen system through which oxygen from the
storage bottles is put into the system. Filler valves normally incorporate a restriction that prevents the
system from being filled too quickly. If they were filled too quickly, enough heat could be built up to cause
an explosion.
fillet (aircraft structure). A fairing used to give shape, but not strength, to an object. A fillet produces a
smooth junction where two surfaces meet. Fillets are often used to produce a smooth, aerodynamically
clean junction between the wing and the fuselage of an airplane.
filling (meteorology). An increase in the central pressure of a meteorological pressure system. Filling,
which is the opposite of deepening, is more commonly applied to a low, rather than a high.
fillister-head screw. A machine screw whose head has a rounded top, straight sides, and a flat bearing
surface. Fillister-head screws often have holes drilled through the head so they can be safetied with safety
wire.
fill threads (aircraft fabric). Threads woven across the width of a piece of fabric, from one selvage edge
to the other. Fill threads are also called woof, or weft, threads.
film strength (lubricant characteristic). The measure of the ability of a lubricant to maintain a continuous
film without breaking down under mechanical pressure.
filter (electrical circuit). A tuned electrical circuit that will pass certain frequencies or bands of
　
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