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thin-film lubrication
thin-film lubrication Imperfect, with occasional
metal/metal contact.
thin-film transistor IGFET constructed by evaporating
on to insulating substrate metal electrodes, semiconductor
layer(s), insulating upper layer and metallic
gate; abb. TFT.
think tank Centralized group of people normally
working for government or large corporation engaged in
futures, forecasting, ultra-new technologies and other
disciplines calling for visionary judgement.
thinner(s) Solvents for paint, dope and other liquids to
reduce viscosity.
thin route Airline route, usually intercontinental,
offering only modest traffic.
thin-tape system Applied to aircraft skin to increase
stealthiness of joints.
THIR Temperature, humidity and IR radiometer.
third-angle projection Convention in engineering
drawing in which front view, side elevation and plan each
show face nearest to it in adjacent view; traditional US
arrangement becoming standard in European aerospace.
third-level carrier Generalized term for ‘third tier’ of
scheduled airline operations, also called feeder or
commuter and often of radial nature serving single city
hub. No clear demarcation separating from second-level
(local-service or regional).
thixotropic Becoming liquid when vibrated or stirred,
setting after standing for a period.
THK 1 Turk Hava Kurumu [national air-sport association;
office, TR-06100 Ankara] (Turkey).
2 Thick.
THL 1 Tailplane hinge line.
2 Tourelle hélicoptere leger (F).
Thld Threshold.
THN Thin.
ThO 2 Thorium oxide.
Thor, THOR 1 Thermionic opening reactor (burst
power up to GW range).
2 Terahertz operational reachback (Darpa).
thoriated Of a TIG electrode, impregnated with thorium
oxide.
thorium Th, silvery radioactive metal, density 11.7, MPt
1,750°C.
Thornel Tradename for carbon and graphite fibres.
thou Thousandth of an inch, 25.4 μ.
THP 1 Thrust horsepower, often thp.
2 Through-hole plated.
3 Turbo-hydraulic pump.
4 Total-head pressure.
THR 1 Threshold, threshold lights.
2 Turboreacteur à hélice rapide = propfan (F).
3 Thrust.
thread chaser Tool for removing contamination, eg
paint or dirt, from thread.
thread filter Long fine screwthread on outer surface of
cartridge inserted tightly into surrounding unthreaded
cylinder to filter fine fragments, typically as last-chance *
before oil reaches vital feed jets.
thread gauge Hand gauge with many specimen threads,
one of which is matched with part.
threading the needle Process of accurately flying through
a small gate in airspace, eg in setting a speed record
(colloq.).
three greens
thread insert Steel helix screwed into soft (eg aluminium)
hole.
threat 1 Hostile anti-aircraft defences, especially airdefence
radars, SAM systems, AAA and fighters.
2 A target that has satisfied the * -detection logic and
therefore requires a traffic or resolution advisory (TCAS).
Threat awareness unit Minimum time flight crew need to
discern collision threat and take avoiding action; performance
envelope of aircraft divided by closure rate of
intruder.
threat circle Projected on cockpit display showing
computed region in which LO aircraft might expect to be
detected by particular hostile radars.
threat cloud Total collection of warheads, chaff and
other penetration aids in ICBM attack.
threat evaluation Process of detecting, analysing and
classifying hostile offensive systems, either in warning of
attack or during penetration of hostile territory when
systems are surface-to-air.
threat library Numerical characteristics of hostile
threats, especially EM emitters, stored in friendly
computer (eg of RWR receiver).
threat simulation Simulation of hostile offensive
systems, eg by add-ons to RPV target to include
emissions, dispensed payloads and jamming.
3AF Association Aéronautique Astrophysique de
France; PAN adds Phénomènes Aérospatiaux Nonidentifies
[UFO].
three-axis autopilot Has authority in pitch, roll and yaw.
3-bar VASI Comprises VASI plus additional pair of
upwind (210 m, 700 ft) wing bars symmetrically disposed
about centreline each having at least two light units, for
use by LEW aircraft.
three-bay biplane Natural extension from two-bay.
three-bearing swivel module 3BSM, turbofan jetpipe
comprising three sections with scarfed (diagonal) joints,
such that rotation of the middle section causes the final
portion to vector from horizontal to vertical (or slightly
beyond). In some designs the whole unit can rotate relative
to the aircraft to provide yaw control.
three-body problem Mechanics of motion of small body
in gravity of two others.
3BSM Three-bearing swivel module (STOVL).
3BV 3-bar VASI.
three-control aeroplane Conventional, with separate
pilot input for each rotational axis.
3-D cam Cam whose profile varies across its width and
which moves axially as well as rotationally.
3-D flow Fluid flow which cannot be represented fully in
2-D, eg flow over a real wing.
3-DOF Three degrees of freedom, usually about orthogonal
axes.
3DQP Three-dimensional quartz-phenolic.
3-D radar Radar enabling position of target to be determined
in 3-D space, either by Cartesian methods or, more
often, by az/el plus slant range.
3-D tool Jig or fixture used to define exact shape of
finished assembly, eg complex hydraulic piping or wiring
loom.
3E Environment, efficiency, economy.
three-float seaplane Main float on the centreline and
stabilizing float on left and right.
3GCS Third-generation cellular system[s].
three greens Landing gear is down and locked (colloq.).
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