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TFW
TFW Tactical Fighter Wing.
TFWC Tactical Fighter Weapons Center.
TG 1 Transportgeschwader (G).
2 Tactical, or Task, Group.
3 Techniques generator (EW).
4 Transmission gate.
5 Training glider (USAAF, 1941–47).
6 Timer – VDL management entity.
7 Terminal guidance.
8 Terminal gap.
9 With suffix numbers, amine-based rocket fuels
(Russia); see suffix zero-2.
Tg Tropical Gulf.
TGA Target gate analysis.
TGAT Tactical GPS anti-jam technology.
TGB Transfer gearbox.
TGC 1 Travel-group charter (US term, basically = UK
ABC).
2 Turbulence gain control.
TGCR Tactical generic cable replacement (FO transmission
system).
TG4 Maximum time between GSIF’s timer.
TGG Third-generation gyro (Northrop).
TGIF Transportable ground interface facility.
TGL 1 Touch-and-go landing (ICAO).
2 Temporary guidance leaflet (FAA).
TGO Thermally-grown oxide.
TGP 1 Twin-gyro platform.
2 Terminally guided projectile.
TGS 1 Triglycine sulphate; pyroelectric IR detector
material.
2 Taxiing, or taxiway, guidance system, (ICAO) or
sign.
3 Turreted gun system.
4 Maximum link-overlap timer.
5 Tactical ground station.
TGSM Terminally guided sub-muniton.
TGT Turbine gas temperature.
2 Target.
3 Titanium/graphite/titanium.
Tgt Opp Target of opportunity.
TG3 Ground-station’s maximum time between transmissions.
TGW Terminally guided weapon.
TG-02 Rocket fuel, 50/50 triethylamine and xylidene,
used with AK-20F oxidant (R).
TH True heading.
T H Total temperature.
THAAD Theater high-altitude air defense [S adds
system] (USA).
THAD Terminal-homing accuracy demonstrator.
Thagg Tactical high-antijam GPS guidance.
THAR Tyre height above runway.
THAWS, Thaws Tactical homing and warning system
(RCA).
THDG True heading.
THDR Thunder.
theatre Geographical area of military operations in
which commander of unified or specified command has
complete responsibility; today used as adjective, often
synonymous with tactical.
theatre range Range of combat aircraft within a theatre,
as distinct from deploy range.
Thel, THEL 1 Tactical high-energy laser.
thermal de-icing
2 Theater high-energy laser (US, Israel).
Thelact Tactical high-energy laser advanced-concept
technology.
The LTAS The Lighter-Than-Air Society [Akron, OH
44306] (US).
Themis Thermal-emission imaging system.
Then Year Actual funds voted or spent; must be
factored for inflation to enable comparison to be made
with ‘now’.
theodolite Optical sight or telescope whose az/el can be
accurately read off angular scales.
Theodorsen Theory [1935] solving unsteady aerodynamic
loads on a 2-D harmonically oscillated aerofoil
in inviscid incompressible flow, * function = symbol C(k).
theoretical gravity That at Earth’s surface if Earth’s
mass was reshaped as perfect sphere.
theoretical thrust coefficient A thrust/time value for
solid-propellant rockets computed from large equation
involving an effective value and assumed conditions for
various areas and pressures. Symbol C° 1 .
therapeutic adaptor Coupled to continuous-flow oxygen
mask, approximately triples flow rate; used for passengers
with respiratory or heart problem.
therapeutic oxygen Administered primarily to treat
ailment, eg pulmonary or cardiac faults.
therm Non-SI unit of energy = 10 5 BTU = 105.506 MJ.
thermal 1 Local column of rising air in atmosphere,
usually caused by surface heat source.
2 To use (1) as energy input for soaring flight.
thermal acoustic fatigue Fatigue of structure caused by
impingement or close proximity of hot gas jet.
thermal anticing Anticing by heating affected surface.
thermal barrier Notional barrier to further increase in
some variable, eg flight speed in atmosphere or turbine
entry temperature in engines, caused by inability of
materials to withstand increased temperatures.
Continually being eroded by new refractory materials.
thermal barrier coating Vast range of refractory
materials, usually deposited by electron beam or plasma
spray, based on zirconia, yttrium and similar exotics.
thermal battery Electrical cell stored inactive and
activated chemically for one-shot high-power output.
thermal blooming See blooming.
thermal coating See thermal barrier coating.
thermal coefficient of expansion Increase of (1) length
per unit length, or (2) area per unit area, or (3) volume per
unit volume, caused by rise in temperature of 1°C (often
defined as from 0° to 1°C, or from 15° to 16°C).
thermal conductance Rate of flow of heat per unit time
through unit cross-section area; 1 BTU.ft -2 h.°F = 5.67826
Wm -2 h.°C; 1 Wm -2 h.°C = 0.17611 BTU.ft -2 .h.°F.
thermal conductivity Time rate of flow of heat through
unit area normal to temperature gradient per unit T°
difference. Symbol λ or k, rate given by Fourier’s law. SI
unit is Wm -1 K -1 ; Imperial (obs.) might be BTU ft –1 s –1 F –1 .
thermal cueing unit Adjunct to FLIR-based attack
system which puts marker boxes round all likely surface
targets, picking them according to their high temperature,
and which automatically feeds target co-ordinates to the
attack system if any of these boxes is touched by the pilot
on the HDD touch display.
thermal cycling Oscillating between low and high
temperatures.
thermal de-icing De-icing by heating affected surface.
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