Aviation Maintenance Terms beginning with T
T-R
Transformer-Rectifier
TA
Traffic Advisory (TCAS II)
TACAN
Ultra-high frequency tactical air navigational aid.
TACAN (Tactical Air Navigation)
A radio navigation facility used by military aircraft for both direction and distance information. Civilian aircraft receive distance information from a TACAN on their DME.
TAI
Thermal anti-ice. A system used to prevent the formation of ice on an aircraft by flowing heated air inside the structure.
TAS
Traffic Advisory System
TAS
True airspeed.
TAT
True Air Temperature
TBDP
Tie Bus Differential Protection
TBO
Time between overhauls. A time period specified by the manufacturer of an aircraft engine as the maximum length of time an engine should be operated between overhauls without normal wear causing parts of the engine to be worn beyond safe limits. TBO depends upon proper operation and maintenance 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 the requirement written into their operations manual.
TC
Type Certificate
TC
Type Certificate
TCAS
Traffic Alert and Collision Avoidance System
TCAS
I TCAS system that does not provide resolution advisories
TCAS
II TCAS system that provides resolution advisories
TCAS
Traffic alert and collision avoidance system. An airborne system that interrogates mode A, C, and S transponders in nearby aircraft and uses the replies to identify and display potential and predicted collision threats.
TCAS
Traffic Alert and Collision Avoidance System
TCAS
I Traffic Alert and Collision Avoidance System (generation 1)
TCAS
II Traffic Alert and Collision Avoidance System (generation 2)
TCAS
A traffic alert and collision avoidance system.
TCAS
Traffic Alert Collision Avoidance System.
TCAS
Traffic Alert and Collision Avoidance System
TCAS I
A TCAS that utilizes interrogations of, and replies from, airborne radar beacon transponders and provides traffic advisories to the pilot.
TCAS II
The second and current generation of instrument warning TCAS. It offers all the benefits of TCAS I, but also offers the pilot direct, vocalized instructions to avoid danger, known as a "Resolution Advisory" (RA). TCAS II systems coordinate their resolution advisories before issuing commands to the pilots, so that if one aircraft is instructed to descend, the other will typically be told to climb — maximizing the separation between the two aircraft.
TCAS II
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
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 Sheets
TDC
Top dead center. The position of a piston in a reciprocating engine when the piston is at the top of its stroke and the wrist pin, crankpin, and center of the crankshaft are all in line.
TDC
Top Dead Center
TEL
Tetraethyl lead.
TFR
Transfer
TIG
Tungsten Inert Gas
TIG welding
Tungsten inert welding is a form of electric arc welding in which the electrode is a nonconsumable tungsten wire. TIG welding is now called GTA (gas tungsten arc) welding.
TIS-B
Traffic Information Service – Broadcast
TIS-B
Traffic Information Service - Broadcast
TIT
Turbine inlet temperature. The temperature of the gases from the combustion section of a gas turbine engine as they enter the turbine inlet guide vanes or the first stage of the turbine.
TMC
Thrust management computer.
TMC
Thrust Management Computer
TMS
Terminal Marking Sleeve
TMS
Thrust Management System
TMSP
Thrust Mode Select Panel
TOM
Time of Measurement
TR unit
A transformer-rectifier unit. A TR unit reduces the voltage of AC and changes it into DC.
TRU
Transformer-Rectifier Unit
TSFC
Thrust specific fuel consumption. A measure of efficiency of a turbojet or turbofan engine. It is a measure of the number of pounds of fuel burned per hour for each pound of thrust produced.
TSO
Technical Standard Order
TSO
Technical Standard Order
TSO
Technical standard order.
TSO
Technical Standard or der
TSOA
Technical Standard Order Authorization
TXPDR
Transponder
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