the Aviation Dictionary

timing disc top overhaul
timing disc - A device or tool that can be mounted on titanium - A dark-gray, silvery, lustrous, very hard,
an accessory drive or on the propeller to indicate the light, and corrosion-resistant metallic element with a
amount of crankshaft travel for ignition or valve symbol of Ti and an atomic number of 22.
riming.
title block - An information block in the lower
tin - A soft, silver-white, metallic chemical element right-hand corner of an aircraft drawing in which the
with a symbol of Sn and an atomic number of 50. name of the part, the part number, and other pertinent
Alloyed with other metals in solders, utensils, and in information is displayed.
making tin plate.
toe-in - Aircraft wheels that tend to converge toward the
tin snips - Hand-operated sheet metal shears.
front. Toe-in will cause the tires to try to move closer
together.
tinned - Coated by soft solder. Two surfaces that have
been tinned can be pressed together and reheated to toe-out - Aircraft wheels that tend to diverge toward the
sweat solder the pieces together.
rear of the wheels. Toe-out will cause the tires to try to
move apart.
tinned wire - Electrical wire that has been coated by a
thin coating - of soft solder.
To-From indicator - An indicator on the course
deviation indicator (CDI). During VOR operation the
tinner's rivet - A flat-headed solid rivet that is driven
vertical needle of the CDI is used as the course
by holding the flat head of the rivet on an anvil and
indicator. The vertical needle also indicates when the
upsetting the rivet by peening the end over with a
aircraft deviates from the course and the direction the
hammer.
aircrafi must be turned to attain the desired course. The
tinplated - Sheet steel coated with a thin layer of tin.
"TO-FROM" indicator indicates whether the course set
in the indicator will take the aircraft to or from the
tip cap - A removable tip on the rotor blade tip. The tip
station.
cap is often used to hold spanwise balance weights.
toggle switch - An electrical switch in which a
tip path plane - The path followed by the tips of a
projecting knob or arm moving through a small arc
propeller as it rotates.
causes the contacts to open or close rapidly.
tip pocket An area ~rovided at the tip of a he'ico~ter
tolerance - allowable variation in the dimensions of
rotor blade to place weight for spanwise balance.
a part.
speed - The 'peed of a rotating
toluene - A co[orless, water insoluble, flammable liquid
subsonic except for fan blade tips and the tip of
(C6H5CH3) used as a solvent, paint remover, and
centrifugal compression blades.
thinner.
tip targets - Reflectors placed on helicopter blade tips
to determine track with a spotlight or a strobe light.
tip weight - A weight placed in the tip of a helicopter
rotor blade for spanwise balance.
tip-path plane - In rotorcraft, the imaginary circular
plane outlined by the rotor blade tips as they make a
cycle of rotation.
tire - A ring or loop made of rubber compound for
toughness and durability. Tires consist of tread, casing
plieslcord body, and beads. Tires provide a cushion of
air that helps absorb the shocks and roughness of
landings and takeoffs. They support the weight of the
aircraft while on the ground and provide the necessary
traction for braking and stopping aircraft upon landing.
tire bead - Bundles of steel wire embedded in the
rubber around the inner circumference of an aircraft
tire. Fits onto the wheel to hold the tire in place.
Turbine Inlet Pressure (TIT)- Temperature taken in
front of the first stage turbine nozzle vanes. The most
critical temperature taken within the engine for use in
fuel scheduling.
toluol - A commercial grade of toluene, which is a
liquid aromatic hydrocarbon similar to benzene, but
less volatile, flammable, and toxic.
ton of refrigeration - A measure of the cooling
capacity of an air conditioning system. It is the same
cooling effect as melting one ton of ice in 24 hours.
tone - 1. A tint or shade of a color. 2. A variation of a
hue. 3. A sound of a specific frequency.
tool - The mold used in manufacturing a composite
component.
tool steel - Hard steel used in the making of tools.
tooling resins -- In composites, resins used to make
molds.
top dead center (TDC)- The position of the piston
within a cylinder when the piston has reached its
Mhest uppermost position.
top overhaul - The overhaul of the cylinders of an
aircraft engine. It consists of grinding the valves,
replacing the piston rings, and doing anything else
necessary to restore the cylinders to their proper
condition. The crankcase of the engine is not opened.
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