the Aviation Dictionary

thrust specific fuel consumption (TSFC) timing chain
assist aircraft brakes and provide aircraft control during
landing and during rejected takeoffs.
thrust specific fuel consumption (TSFC) - 1. An
equation, TSFC = WfF,, where Wf is fuel flow in
pounds per hour and F, is the net thrust in pounds.
Used to calculate the fuel consumption as a means of
comparison between engines. 2. The amount of fuel an
engine bums in one hour to produce one pound of
thrust.
thrust, gross - The thrust developed by an engine, not
taking into consideration any pressure of initial air
mass momentum. Also referred to as static thrust (Fg).
thrust, net - The effective thnist developed by a jet
engine during flight, taking into consideration the
initial momentum of the air mass prior to entering the
engine.
thruster - A miniature rocket engine fired to change
orientation of space vehicles and orbiting satellites.
thunderstorm - Cumulonimbus clouds charged with
electricity and producing lightning, thunder, rain, and
hail.
thyratron - Gas-filled triode electron tube in which a
continuous current is caused to flow by a momentary
signal applied to the grid.
thyratron tube - A triode tube into which a gas has
been introduced to change its operating characteristics.
thyristor - A semiconductor device that acts as a
switch.
the time to sense and relate current experiences in
context with previous events.
time between overhaul (TBO)- A recommendation of
the manufacturer of an aircraft engine as to the amount
of time that the engine can operate under average
conditions before it should be overhauled.
time change item - Any item, component, unit, etc.
whose time in service is limited by hours, the number
of times the unit is operated, or a calendar basis, and
that must be removed and replaced with a new or
similar item. Also referred to as a time limited part.
time constant - The time required for the voltage of a
capacitor in an RC circuit to increase to 63.2 percent of
maximum value or decrease to 36.7 percent of
maximum value.
time constant of an electric motor - The time required
for a motor to accelerate from off to its rated no-load
speed.
thumbscrew - A machine screw that has a round flat time delay relay - A relay that delays the closing or
projection perpendicular to the screw shank. Thumb opening of the relay for a specified time after
screws can be turned by hand and are used on access activation.
panels where it is necessary to frequently open and
time group - Four digits representing the hour and
close the panel.
minutes from the Coordinated Universal Time (UTC)
thunder - A loud noise heard when lightening occurs clock. FAA uses UTC for all operations. The term
between clouds or between clouds and the ground. The "ZULU" can be used to denote UTC. The word "local"
lightening generates instantaneous high heat, which or the time zone equivalent shall be used to denote
causes a violent expansion of the surrounding air. This local when local time .is given during radio and
expanding air causes the shock wave or noise of telephone communications. When written, a time zone
thunder. designator is used to indicate local time; e.g., "0205M
thundercloud - A cumulonimbus cloud.
(Mountain). The local time can be based on the 24-
hour clock system. The day begins at 0000 and ends at
time in service - With respect to maintenance time
records, means the time from the moment an aircraft
leaves the surface of the Earth until it touches it at the
next point of landing.
time limited part -- Any item, component, unit, etc.
whose time in service is limited by hours, the number
of times the unit is operated, or a calendar basis, and
that must be removed and replaced with a new or
similar item. Also referred to as a time change item.
timed turn - The most accurate way to turn to a specific
tie bolt - Bolts used to assemble wheel halves on split
heading without the heading indicator. Use the clock
aircraft wheels.
instead of the compass card to determine when to roll
tie rod - Tension rod used for internal and external out.
bracing parts. The ends are Time-Rite Indicator - A piston position indicator,
threaded for attachment and length adjustment.
made by Time-Rite, used for locating the position of a
tiedown - A special anchoring provision on an airport
surface to which airplanes can be secured when parked.
tight-drive fit - An interference fit between parts.
time and opportunity - A perception factor where
learning something is dependent on the student having
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piston in the cylinder of a reciprocating engine for the
purpose of magneto or valve timing.
timing chain - A metal chain that connects the
crankshaft to the camshaft of a reciprocating engine.
Causes the valves to open and close in proper
coordination with the motion of the pistons.