the Aviation Dictionary

few ~ermit - files. classification
maintenance base. Feny flights, under certain field excitation - DC supplied to the field of an
conditions may be conducted under terms of a special alternator or generator to magnetic flux, which
flight permit.
is cut by the conductors in the armature or stator.
ferry permit - Commonly used name for Special Flight field frame - The main structure of a generator or motor
Permit. A Special Flight Permit issued by the FAA on which field poles and windings are mounted.
allows an unlicensed gircraft to be flown from one
field maintenance - The maintenance performed on
location to another location.
aircraft remotely or semi-remotelv from the home
fiber - A single strand of material, used as a station. Typically, there are few tools or equipment to
reinforcement because of its high strength and implement normal maintenance procedures.
stiffness.
field strength - 1. The intensity of the magnetic strength
fiber bridging - In composites, reinforcing fiber of a magnet or electromagnet. 2. The intensity of the
material that bridges an inside-radius of a pultmded electromagnetic field emanating from a radio
product. This condition is caused by shrinkage stresses transmitter antenna.
around such a radius during cure.
field strength meter - An electrical instrument that
fiber content - The amount of fiber in a composite measures the strength of an electromagnetic field
expressed as a ratio to the matrix. The most desirable radiating from a radio transmitting antenna.
fiber content is a 60:40 ratio. This means there is 60%
filament - 1. The heated element in a light bulb or
fiber and 40% matrix material.
electron tube. In an electron tube, the heat speeds up
fiber direction or orientation - In composites, the the molecular movement in the cathode that emits
orientation of the fibers in a laminate to the 0" electrons. 2. The smallest unit of a fibrous material.
reference designated by the manufacturer.
filament winding - In composites, a manufacturing
fiber locknut - A type of self-locking fastener with a method in which long continuous fiber is wound
fiber insert that puts - pressure - on the threads to lock the around a mandrel to produce a structure.
nut in place. This prevents the nut from turning when
file - A hand-operated cutting tool made of high-carbon
installed in areas subject to vibration.
steel and fitted with rows of very shallow teeth
fiber optics - The transmission of light through a bundle extending diagonally across the width of the tool.
of fiber rods. Often used in areas where light must be
filed - Normally used in conjunction with flight plans,
transmitted, but where it is inconvenient or dangerous
meaning a flight plan has been submitted to ATC.
to use electrical transmission. An o~tical device called
a Borescope uses tiny glass rods that conduct light and filed enroute delay - Any of the following preplanned
vision to make inspection around comers practicable. delays at pointsfareas along the route of flight which
Fiber optics are also used to transmit information from require special flight plan filing and handling techone
electronic device to another.
niques.
a. ~ekinal Area Delay. A delay within a terminal area
fiber reinforced plastics (FRP) - Term used
for touch-and-go, low approach, or other terminal area
interchangeably for advanced composites
activity.
fiberglass - Extremely thin fibers of glass. May be b. special Use Airspace Delay. A delay within a Military
woven into a cloth or lightly packed into a mat. Used to Operating Area, Restricted Area, Warning Area, or
reinforce epoxy or polyester resin for aircraft structure. ATC Assigned Airspace.
c. Aerial Rcheling Delay. A delay within an Aerial
fiberglass reinforcement - In composites, fiberglass
Refueling Track or Anchor.
used as a reinforcement in a plastic r~latrix.
filed flight plan - The flight plan as filed with an ATS
fidelity - The degree of similarity between the input and
unit by the pilot or his designated representative withoutput
waveforms of an electronic circuit.
out any subsequent changes or clearances.
field - A space in which magnetic or electric lines of
files, classification - The teeth on a file vary from very
force exist.
fine to coarse in the following - sequence:
-
field coil - Coil or winding used to produce a magnetic a. Dead-smooth cut
field.
b. Smooth cut
c. Second cut
field effect transistor (FET) - A special form of
d. Bastard cut
semiconductor device with high input impedance.
e. Coarse cut
Electron flow between its and drain is
Files with a single set of cutting teeth are called single-cut
controlled by a voltage applied to the gate.
files. A file that has a second set of cutting teeth
field elevation - See Airport Elevation
crossing the first set is called a double-cut.
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