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
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
TCAS
Traffic Alert 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
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.
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
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.
TMS
Terminal Marking Sleeve
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.
TSOA
Technical Standard Order Authorization
TXPDR
Transponder
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