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frequencies while attenuating others. See band-pass filter, band-reject filter, high-pass filter, and low-pass
filter.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 245
filter (fluid filter). A component in a system that traps and holds contaminants carried in the fluid flowing
through the system. Aircraft fuel systems, lubrication systems, and hydraulic systems all use filters.
filter capacitor (electronic component). An electrolytic capacitor connected in parallel with the output of
a DC power supply. The capacitor has a low impedance for any ripple that may be superimposed on the DC
output, and the ripple is passed to ground, while the DC is not affected.
filter choke (electronic component). An iron-core inductor installed in series with the output of a DC
power supply. The filter choke impedes, or opposes, any ripples or portions of alternating current that are
superimposed on the DC output.
fin (aircraft structural component). A fixed vertical aerodynamic surface used to provide directional
stability to an aircraft.
final approach (aircraft flight operation). The portion of an aircraft flight just before landing. The
aircraft is aligned with the runway and is on a descending flight path.
final approach course (aircraft flight operation). A straight-line extension of a localizer, a final approach
radial, or a runway center line, all without regard to distance.
final approach fix. See FAF.
final approach-IFR (air traffic control). The flight path of an aircraft which is inbound to an airport on a
final instrument approach course, beginning at the final approach fix or point, and extending to the airport
or the point where a circle-to-land maneuver or a missed approach is executed.
final approach point. See FAP.
final controller (air traffic control). The controller providing information and final approach guidance
during precision approach radar (PAR) and airport surveillance radar (ASR) approaches utilizing radar
equipment.
final monitor aid (air traffic control). A high-resolution color display that is equipped with the
controller-alert system hardware/software which is used in the precision runway monitor (PRM) system.
The display includes alert algorithms providing the target predictors, a color-change alert when a
target penetrates or is predicted to penetrate the no transgression zone (NTZ), a color-change alert if the
aircraft transponder becomes inoperative, synthesized voice alerts, digital mapping, and like features
contained in the precision runway monitoring (PRM) system.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 246
fineness ratio. The ratio of the length of a streamlined body to its maximum diameter.
fine-wire spark plug (aircraft reciprocating engine component). A type of spark plug used in aircraft
engines that have problems with lead fouling the plugs. The electrodes are made of small-diameter
platinum or iridium wire which leaves the firing end of the spark plug open so the gases inside the cylinder
can scavenge the lead compounds before they solidify and foul the plug.
finger brake (sheet metal shop tool). Another term for a box brake. See box brake.
finger patch (welded structural repair). A type of patch welded over a cluster in a welded truss-type
aircraft fuselage. The patch covers and reinforces damaged areas of the tubes and has fingers that extend
out along each of the tubes in the cluster.
finger screen (fuel system filter). A coarse-mesh, small-diameter screen made in the shape of a finger. A
finger screen is installed in the end of the outlet line inside a fuel tank to prevent large contaminants from
restricting the flow of fuel from the tank.
Small contaminants and water that pass through the finger screen are trapped in finer screens and
filters further along in the fuel system.
finishing tape. Another name for surface tape. See surface tape.
finish turning (metal machining). A step in the machining of a metal part in which the part is turned to its
correct dimension and given its final smoothness.
FIR (flight information region). An airspace of defined dimensions within which flight information
service and alerting service are provided.
fire detection system (aircraft fire warning system). A system in an aircraft that warns the flight crew of
the presence of a fire in any of the engines, the cargo area, or the wheel wells.
fire extinguisher. A device, either hand-held or installed in an aircraft, that directs a fire extinguishing
agent onto a fire.
fire extinguishing agent. A chemical used to extinguish a fire. A fire extinguishing agent can extinguish a
fire by reducing the temperature of the fuel to a value below its kindling point, by excluding oxygen from
　
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