ferrule terminals (electrical fuse component). The terminals on each end of a tubular fuse. Ferrule terminals are short, closed, metal caps that slip over the ends of a glass tube that contains a fuse link. The ferrule terminals are held in fuse clips.
ferry flight. A flight for the purpose of returning an aircraft to base, delivering an aircraft from one location to another, or moving an aircraft to and from a maintenance base.
Ferry flights, under certain conditions, may be conducted under terms of a special flight permit.
ferry permit. A special flight permit issued by the Federal Aviation Administration that allows an unlicensed aircraft to be flown from its present location to another location where it can be repaired, inspected, or otherwise prepared for licensing.
FET (field effect transistor). A high-impedance semiconductor device in which the flow of load current between the source and drain is controlled by variations in voltage on the gate, rather than current, as is done with a bipolar transistor.
Load current flowing between the source and the drain, through a semiconductor channel, is switched and regulated by the effect of an electric field exerted by the voltage on the gate. An FET is sometimes called a unipolar transistor.

FHP (friction horsepower). The amount of horsepower used to turn the crankshaft, pistons, gears, and accessories in a reciprocating engine and to compress the air inside the cylinders.
fiberglass. Thin fibers of glass used to reinforce plastic resins in the manufacture of strong, lightweight structural components. The glass fibers have diameters between 0.005 mm and 0.2 mm (0.0002 inch and