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major element of its design, construction or systems and
thus prove new concept.
TET 1 Turbine-entry temperature, see turbine temperatures.
2 Tolerable exposure time, esp. with reference to
aircraft in high-speed flight in gusts.
3 Technical evaluation test.
TETA Triethylene-triamine.
Tete Total estimated time en route.
tethered satellite One connected to a space station,
Shuttle Orbiter or other parent body by a fine cable up to
100 km (62.1 miles) in length.
tether system Later concept in which two masses are
joined by tether (typically 50 km, 31 miles), self-aligning
along radial from planetary body and offering advantages
in changing orbital parameters, visiting bodies (e.g.
Jovian satellites) in succession and generating electric
power.
Tetra 1 Turbine-engine transient response analyser
(EDP code).
2 Terrestrial trunked radio.
tetraethyl lead Liquid added to most petrols (gasolines)
to improve resistance to detonation (anti-knock value or
fuel grade); base material is Pb(C 2 H 5 ) 4 . Resulting fuel is
called leaded. TEL content is typically about 5.2 ml/gal,
4.33 ml/US gal [or 2.18/1.815 for LL fuel]. See Avgas.
tetrode Thermionic valve (tube) containing cathode,
plate and two other electrodes.
Tetwog Turbine-engine testing working group.
TEU Trailing edge up.
TEV Test, evaluation and verification.
Tevi Turbine-engine vibration indicator.
Tewa, TEWA Threat-evaluation and weapon
assignment.
TEWS, Tews Tactical electronic-warfare suite, or electronic
warning system.
TEWT Pronounced tute, tactical exercise without
troops.
Textolite Obsolete ‘plastics’; hot pressed canvas/resin
laminates.
textured visuals Visuals whose CGI tones are not plain
grey shades but have texture corresponding to real life,
giving enhanced spatial cues. Usually achieved by digital
and photographic imagery combined.
TEZ Total exclusion zone.
TF 1 Trip fuel.
2 US military engine-designation prefix: turbofan.
3 US military aircraft designation prefix: fighter
trainer; dual version of established fighter.
4 Turbine fuel is available.
5 Toroidal field.
6 Technology forecasting.
7 Torpedo (armed) fighter (UK, pre-1953).
8 Terrain-following.
9 Thin film.
10 Tandem fan.
11 Task force.
12 Toll free.
13 Time/frequency (or T/F).
14 Traffic flow.
15 Track to a fix.
T/F Transformer.
T f 1 Temperature at flexible T-O rating.
2 Fuel temperature.
TFV
t f Radar frame time.
TFA Transfer-function analyser.
t fa Average time between false alarms.
T-fast Technology for frequency-agile digital synthesized
transmitters.
TFB Tower fly-by.
TFC 1 Total final consumption.
2 Tactical fusion centre (AAFCE).
3 Tactical fire control.
4 Tactical flag command; C adds centre.
5 Taxes, fees and charges.
tfc Traffic (FAA).
TFD 1 Thin-film diode.
2 Time/frequency display.
TFDC Test Flight and Development Centre [Overberg
AFB] (S Africa).
TFE 1 Terrain-following E-scope.
2 Therminioc fuel element.
3 Tetrafluoroethylene, major additive to magnesium
IRCM.
TFEC Tactical fighter electronic combat.
TFEL Thin-film electroluminescent display, a CRT
alternative.
TFF 1 Tri-fluid fuel.
2 Thin-film filter.
TFG 1 Thrust-floated gyro.
2 Tactical Fighter Group.
TFH Thick-film hybrid.
TF/HF Tandem fan, hybrid fan.
T-fix Elapsed time since last update of position of
moving surface target.
TFK Trainer facility kit.
T-Flir Targeting FLIR.
TFM 1 Tactical flight management system.
2 Traffic flow management.
TFMS 1 Tactical frequency-management system.
2 Traffic-flow management system (FAA).
TFOV, TFoV Total field of view, limited in HUD by
head freedom and optical aberrations.
TFP Technology forecast panel
TFPA Torso front protective armour.
TFQI Transonic flying qualities improvement.
FPRT Thin-film platinum resistance thermometer.
TFR 1 Terrain-following radar.
2 Total fuel remaining.
3 Temporary flight restriction area (FAA).
TFS 1 Tactical Fighter Squadron.
2 Transformational force structure.
TFSB Tungsten-filament seven-bar display.
T/FSDS Time/frequency standards distribution system.
TFSF Time to first system failure.
TFSUSS Task-force on scientific users of space station.
TFT 1 Thin-film transistor.
2 Trim for takeoff.
TFTA Terrain following, terrain avoidance.
TFTA 2 Terrain following, terrain avoidance, threat
avoidance.
TFTP Trivial file transfer protocol.
TFTS 1 Tactical Fighter Training Squadron.
2 Terrestrial flight telecommunications, or telephone,
system.
TFU 1 Turret Flir unit.
2 Technical follow-up.
TFV Traffic-flow violation.
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