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takeoff thrust. 14 CFR Part 1: “With respect to turbine engines, means the jet thrust that is developed
under static conditions at a specific altitude and atmospheric temperature under the maximum conditions of
rotorshaft rotational speed and gas temperature approved for the normal takeoff, and limited in continuous
use to the period of time shown in the approved engine specification.”
takeoff warning system. An aural warning system that provides an audio signal when the thrust levers are
advanced for takeoff if the stabilizer, flaps, or speed brakes are in an unsafe condition for takeoff.
tandem. One object ahead of another. Tandem seating in an airplane has one seat ahead of the other. The
wheels of a bicycle are tandem wheels.
tandem bearings (ball bearing configuration). Two sets of ball bearings mounted on a shaft in such a
way that both bearings support the thrust load.
tandem wing configuration. 14 CFR Part 1: “A configuration having two wings of similar span, mounted
in tandem.”
tang. A tapered shank sticking out from the blade of a knife or a file. The handle of the knife or file is
mounted on the tang.
tangent (geometric tangent). A line that touches a curve at one point only and does not cross the curve.
tangent of an angle (trigonometric function). The tangent of an angle in a right triangle is the ratio of the
length of the side of the triangle opposite the angle, to the length of the side adjacent to (next to) the angle.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 570
tank circuit (electronic circuit). A resonant electronic circuit composed of a capacitor and an inductor in
parallel. Electrical energy is stored in a tank circuit in the form of electromagnetic and electrostatic fields
that build up and decay at a frequency determined by the capacitance and the inductance in the circuit.
tantalum. A hard, gray, or steel-blue metallic chemical element. Tantalum’s symbol is Ta, its atomic
number is 73, and its atomic weight is 180.948. Tantalum is used in the manufacture of light bulb filaments,
and tantalum oxide is used in electrolytic capacitors.
tantalum carbide. A compound of tantalum and carbon in a hard, crystalline form, used for making cutting
tools and dies.
tantalum-foil capacitor. A type of electrolytic capacitor that uses tantalum foil for the plates. An oxide
film formed on the anode, the positive plate, serves as the dielectric. Absorbent paper saturated with an
electrolyte keeps the plates separated. The large capacity of a tantalum-foil capacitor is caused by the
thinness of the oxide-film dielectric.
tap (thread-cutting tool). A metal-cutting tool used to cut threads on the inside of a hole. A taper tap is
used to start the threads in the hole; then a plug tap is used to cut threads to almost the full depth of the hole.
If it is necessary that the threads extend to the very bottom of the hole, a bottoming tap is used. The threads
cut by a bottoming tap are the same from one end to the other.
tap drill. A twist drill of the correct size to drill a hole to be tapped. There is a correct tap drill for each size
tap.
tape measure. A long, narrow strip of cloth, paper, or steel with graduations of inches or millimeters
marked along its edge.
taper (dimensional change). A gradual change in the width or thickness of an object along its length.
taper (resistance change). The relationship between the change in the resistance of a potentiometer or
rheostat and the amount of rotation of its shaft. The resistance of a linear-taper potentiometer or rheostat
changes in direct proportion to the number of degrees the shaft is rotated.
tapered pin. A type of hardware used to fasten concentric tubes together or to fasten a sleeve around a
solid shaft. A tapered pin is pressed into a tapered hole drilled through the components to be joined. Some
tapered pins are secured in place by passing safety wire through a hole in the large end of the pin and then
wrapping it around the shaft or tubes. Other tapered pins are secured with a nut screwed onto threads cut
onto the small end of the pin.
tapered propeller shaft (reciprocating engine component). A propeller shaft with a tapered end that fits
into a tapered hole inside the propeller hub. A tapered propeller shaft is prevented from turning in the hub
by a hardened steel key that fits in matching grooves in the shaft and the hub.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 571
tapered punch. A hand-held punch that is tapered from its full shank size to a smaller diameter at its end.
Tapered punches are used to start bolts, pins, or rivets from their holes.
tapered roller bearings. A form of antifriction bearing that uses hardened steel rollers between hardened
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航空术语词典Dictionary of Aeronautical Terms 下(82)
