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travelling-wave aerial
travelling-wave aerial One in which sinusoidal waves
travel from feeder to terminated end.
travelling-wave amplifier Microwave amplifier depending
on interaction between slow-wave field (eg
travelling along wire helix) and electron beam directed
along axis.
travelling-wave magnetron Usual type of modern multicavity
magnetron in which TWT-type amplification is
used at high power.
travelling-wave tube Various species of microwave
amplifiers in which interaction takes place between
electron beam and RF field travelling in same or opposite
direction or in other arrangement; abb. TWT.
travel pod Streamlined external pod carried on normal
pylon or hardpoint of fighter for pilot or crew personal
baggage [rarely, for aircraft support equipment].
traverse 1 To rotate in azimuth.
2 To take set of readings along line, either discrete readings
(eg pitot pressure) at selected points or forming
continuous plot, eg from point well below trailing edge of
wing to point well above (in this case called pitot *).
3 Surveying method based on accurate distance/angle
measures between fixed points.
4 Aircraft track made up of large number of straight
legs linked by turns usually of 90° or 180°; used in search,
patrol or EW duties (US term).
traverse flying Flying along traverse (4).
trawling Free-ranging search for targets of opportunity.
TRB Transporatation Research Board [Washington,
DC20418] (US).
TR box Transmit-receive switch in system (eg radar)
using one aerial for emitting and reception; prevents
emitted signal from being passed to receiver.
TRC 1 True track.
2 Thrust rating computer.
3 Traffic counts.
TRCS Techniques for determining near-field radar
cross-section of space vehicles, eg RVs.
TRCV Tri-colour VASI.
TRD 1 Western rendering of turbo-reaktivny dvigatel,
Russian for turbojet.
2 Torsional resonance damper.
3 Test requirements document.
4 Towed radar decoy.
5 Transit routing domain.
TRDI Technical Research and Development Institute
(JDA).
TRE 1 Has been used in classified ads to mean
transmitter/receiver equipment, transponder equipment,
tactical receive equipment.
2 Telecommunications Research Establishment,
Malvern, later RSRE.
3 Type-rating examiner.
4 Target-rich environment.
tread 1 Track (8) (US usage).
2 Normal meaning for * of tyre.
T rec Recovery air temperature[s].
Trecom Transportation Research Command (USA).
T-Recs, TRECS Tactical radar electronic combat
system.
TREE, Tree 1 Transient radiation effects on electronics.
2 Test and repair of electronic equipment.
TREF 1 Transient Radiation Effects Laboratory
(USAF).
triangulation balloon
2 Transportable [RAF] or tactical [RNethAF] reconnaissance
exploitation facility.
trefoil Cluster of three parachutes.
Trek Telescience research kit, ground-based workstations.
trellis control See lattice fin.
trenched 1 Of rotating shaft, provided with multiple
grooves forming labyrinth seal.
2 Of passenger-transport aisle, lower than rest of floor
on which seats are mounted.
TREND Conditions [eg, for landing] in next two hours.
Trends Tilt-rotor engineering database system.
trepanning 1 Traditionally, using a cutter carried on the
end of a rotating arm in order to cut a hole.
2 Using a high-power laser to cut a small hole and then
expand it using a rotary motion.
TRES Tactical radar and ESM system.
TRF 1 Tuned radio frequency.
2 Threat radar frequency (US adds ‘spectrum
utilization’).
3 Tactical replay facility.
TRG 1 Tuned rate-gyro.
2 Training.
TRGB Tail-rotor gearbox.
TRI Type-rating instructor.
TRIA 1 Tungsten-reinforced iron alloy.
2 Tracking range instrumented aircraft (USAF).
Triac 1 Test Resources Improvement Advisory Council
(AFSC).
2 Without initial capital, semiconductor gate (switch)
similar to silicon rectifier but triggered by either positive
or negative pulse.
Triad 1 US deterrent concept based on simultaneous
demonstration of hard land missiles, SLBMs and
recallable bombers.
2 Triple air defense (USA).
3 Technique for reading an integrated air defense (US);
S adds system, but see next.
Triads Tri-wall air delivery system, containers which
glide down under lift from their yellow plastic packaging
(USAF).
triage Urgent investigation of casualties of NW attack
to determine which need, and will respond to, medical
treatment.
triagraph Three-digit (numeral/letter) callsign used by
whole formation or squadron (often changed), each
aircraft having two-number suffix. To launch NW strike
each aircraft would have had unique *, previously subject
to frequent change (RAF).
triangle of velocities Basic triangle in DR navigation
with sides representing heading (course) and TAS, track
and G/S, and wind velocity.
triangular parachute One whose canopy is approximately
triangular when laid out flat.
triangular pattern Regular repeated flight pattern flown
by aircraft with radio failure: equilateral triangle with
sides 1 min (jet) or 2 min (others); flown left or righthanded
depending on whether transmitter and receiver
failed or only transmitter.
triangulation Mensuration technique, eg in sheet metalwork,
in which whole area is divided into equal adjoining
triangles.
triangulation balloon Small balloon used as sighting
mark in triangulation survey.
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