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TBO (time between overhauls). A time period specified by the manufacturer of an aircraft engine as the
maximum length of time the engine should be run between overhauls without normal wear causing parts of
the engine to be worn beyond safe limits. TBO depends upon the engine being operated properly and
maintained in accordance with the engine manufacturer’s recommendations.
The overhaul of an engine when it reaches its TBO hours is not mandatory except for certain
commercial operators that have this requirement written into their operations manual.
TCA (terminal control area). Controlled airspace extending upward from the surface or higher to
specified altitudes within which all aircraft are subject to operating rules and pilot and equipment
requirements specified in 14 CFR Part 91.
TCAS (traffic alert and collision avoidance system). An electronic warning system installed in an
aircraft that detects nearby aircraft and warns the pilot, showing the range, altitude, and course of the
impending threat. The TCAS informs the pilot of the appropriate maneuver to use to avoid a collision.
TCAS I. 14 CFR Part 1: “A TCAS that utilizes interrogations of, and replies from, airborne radar beacon
transponders and provides traffic advisories to the pilot.”
TCAS II. 14 CFR Part 1: “A TCAS that utilizes interrogations of, and replies from airborne radar beacon
transponders and provides traffic advisories and resolution advisories in the vertical plane.”
TCAS III. 14 CFR Part 1: “A TCAS that utilizes interrogation of, and replies from airborne radar beacon
transponders and provides traffic advisories and resolution advisories in the vertical and horizontal planes
to the pilot.”
TCDS (Type Certificate Data Sheet). See Type Certificate Data Sheet.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 573
TCLT (tentative calculated landing time) (air traffic control). A projected time calculated for the
adapted vertex for each arrival aircraft based upon runway configuration, airport acceptance rate, airport
arrival delay period, and other metered arrival aircraft.
TCLT is either the vertex time of arrival (VTA) of the aircraft or the tentative or actual calculated
landing time (TCLT/ACLT) of the previous aircraft plus the arrival aircraft interval (AAI), whichever is
later. TCLT will be updated in response to the aircraft’s progress and its current relationship to other
arrivals.
TCP (trichresyl phosphate). A colorless, combustible compound, (CH3C6H4O)3PO, that is used as a
plasticizer in aircraft dope and an additive in gasoline and lubricating oil. TCP aids in scavenging lead
deposits left in the cylinders when leaded fuel is burned.
TDC (top dead center). The position of a piston in the cylinder of a reciprocating engine when the piston
is at the top of its stroke and the piston pin, crank pin, and the center of the crankshaft are all in line.
tear-down area (overhaul shop). The area in an overhaul shop set aside for disassembling the equipment
being overhauled. Tear-down areas are usually located near the point the equipment is received into the
shop. There are facilities in the tear-down area to remove most of the grease and dirt from the equipment
before it is taken into the main part of the shop.
TEB (triethyl borane). A fuel additive that ignites on contact with oxygen. It is used as a catalyst to ignite
the low-flammable JP-7 used in the Lockheed SR-71 fuel during engine start and afterburner lights.
technetium. A synthetically produced, silvery-gray, metallic chemical element. Technetium’s symbol is Tc,
and its atomic number is 43. Technetium is used in the manufacture of corrosion-resistant steel.
Technical Standard Order. See TSO.
technician. A specialist in one of the technical fields. In research and development, technicians often assist
engineers. The engineer’s knowledge of the theory behind the project is usually greater than that of the
technician, but the technician usually has a more practical approach and is able to build the things the
engineer designs.
tee fitting. A connector, made in the shape of the letter T, for joining either rigid or flexible fluid lines.
Teflon. The registered trade name for a fluorocarbon resin. Because of its good resistance to chemical
action and its strength at elevated temperatures, Teflon is used for fluid lines and backup rings in fluid
power components.
TEL (tetraethyl lead). An additive used in aviation gasoline to improve its antidetonation characteristics.
Tetraethyl lead, Pb(C2H5)4, is a heavy, oily, poisonous liquid mixed with the gasoline at the refinery.
Tetraethyl lead increases the critical pressure and temperature of the fuel.
　
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