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used to wipe a surface to prepare it to receive a coat of finishing material.
tack weld. A method of holding a structure together before it is permanently welded. The parts of the
structure are cut and fitted together, and each joint is welded with a small spot. When all of the joints fit
and line up as they should, the final welding is done.
tacky (finishing system condition). The condition of a finishing system in which the material is slightly
sticky to the touch.
tag wire. Small-diameter, soft steel wire used to tie identification tags to objects.
TAI (Thermal Anti-Ice). See thermal anti-icing system.
tail boom (aircraft structure). A spar, or small-diameter structure that connects the tail section of an
aircraft to a pod-type fuselage.
tail cone (gas turbine engine component). The cone-shaped section of the exhaust system of a gas turbine
engine used to produce the correct change in area of the duct through which the exhaust gases leave the
engine.
tailets. Small vertical surfaces mounted on the underside of the horizontal stabilizer of some airplanes to
increase directional stability.
tail-heavy (aircraft balance condition). The condition of balance of an aircraft in which the center of
gravity is behind its allowable aft limit.
tail load (aerodynamics). The downward aerodynamic force produced by the horizontal tail surfaces of an
airplane. Tail load normally acts downward to give the airplane longitudinal stability. The lift produced by
the wing of the airplane must overcome the downward-acting tail load, as well as the downward-acting
force caused by the weight of the airplane.
tail pipe (engine exhaust system component). The part of the exhaust system of either a reciprocating
engine or a gas turbine engine through which the exhaust gases leave the engine. If a muffler is installed in
the exhaust system of a reciprocating engine, the tail pipe usually connects to the muffler and carries the
exhaust gases away from the airplane.
tail rotor (helicopter component). The small, auxiliary rotor installed on the tail of a single-rotor
helicopter. The tail rotor turns in a vertical plane to produce thrust that counteracts the torque produced by
the main rotor. The pitch of the tail rotor blades is controlled from the cockpit by the control pedals.
tail skid (airplane landing gear component). A small skid mounted on the bottom of the aft end of the
fuselage of an airplane equipped with a tricycle landing gear. The tail skid absorbs the shock and prevents
damage to the structure if the airplane should be rotated too abruptly on takeoff.
In the early days of aviation when airplanes had no brakes and operated from grass fields, tail
skids were used rather than tail wheels to support the tail of the airplane when it was on the ground.
tail warning radar. A radar system installed in military aircraft to warn the pilot of an aircraft approaching
from behind.
tail wheel (airplane landing gear component). A small, swiveling or steerable wheel mounted at the aft
end of the fuselage of an airplane equipped with a conventional landing gear. The tail wheel supports the
rear end of the airplane when it is on the ground.
tail wind (aircraft navigation). Wind blowing in the same direction the aircraft is moving. When an
aircraft is flying with a tail wind, its speed over the ground is equal to its speed through the air, plus the
speed the air is moving over the ground.
takeoff (aircraft flight). The portion of an aircraft flight in which the aircraft leaves the ground.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 569
takeoff power (aircraft engine specification). The amount of power an aircraft engine is allowed to
produce for a limited period of time. The use of takeoff power is normally limited to no more than one
minute.
14 CFR Part 1: “(1) With respect to reciprocating engines, means the brake horsepower that is
developed under standard sea level conditions, and under the maximum conditions of crankshaft rotational
speed and engine manifold pressure approved for the normal takeoff, and limited in continuous use to the
period of time shown in the approved engine specification; and (2) With respect to turbine engines, means
the brake horsepower that is developed under static conditions at a specific altitude and atmospheric
temperature, and under the maximum conditions of rotor shaft 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 safety speed. 14 CFR Part 1: “A referenced airspeed obtained after lift-off at which the required
one-engine-inoperative climb performance can be achieved.”
　
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