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2-star red
series, either both driven by crankshaft or with first (LP
impeller) driven by exhaust turbo.
2-star red Standard distress pyrotechnic, fired without
pistol.
two-step supercharge Throttle is gated below rated altitude,
thereafter being free to move to maximum position;
used with or without two drive ratios.
2-stick Dual-control aircraft (colloq.).
two-stroke Piston-engine cycle in which every upstroke
expels exhaust and compresses mixture and every downstroke
provides power. Often abb. 2T. Not normally
certificatable for unrestricted aviation use.
2-view drawing Orthographic projection drawing
comprising two views, usually left-side elevation and plan.
TWP 1 Two-way programme.
2 Technical-work programme.
TWR 1 Threat-warning receiver (formerly sometimes
rendered as tail-warning radar).
2 Tower (or twr); suffixes: INC, in cloud; INH, in haze;
INK, in smoke; INP, in precipitation; INUN, in unknown
obscuration.
3 Turbulence weather radar.
twr Tower; one definition = aerodrome control.
T/W ratio Thrust/weight ratio.
TWRG Towering.
TWS 1 Tail-warning set or system.
2 Track-while-scan.
3 Threat-warning system.
4 Through-wall surveillance.
5 Thermal weapon sight.
6 Tactical work station.
7 Terminal weather system.
TWSC Thin-wall steel case.
TWSRO Track-while-scan in receive mode only.
TWSS 1 TOW weapon subsystem.
2 Track-while-scan system.
TWT 1 Travelling-wave tube.
2 Transonic wind tunnel.
TWTA TWT amplifier.
TWU 1 Tactical Weapons Unit (RAF).
2 Transport Workers Union, now Transport Workers
of America (US).
TWX 1 Theatre war exercise.
2 Teletypewriter exchange.
TWY, twy Taxiway.
TWYL Taxiway link.
TX, tx Transmitter, transmit, transmission.
T x Horizontal component of thrust.
TXP Transponder (also TPDR, XPDR etc).
TXT Text.
TYD, TY$ Then-year dollars, ie based on a selected
historic monetary value.
TYP Type of aircraft (ICAO).
TZP
type 1 Particular type of aircraft, ignoring marks or
subdivisions.
2 Human being, especially adult male (as ‘a good *’, ‘a
quiet *’, colloq. RAF usage, WW2).
type approval Issue of type certificate.
type certificate Legal document, in US issued by FAA,
allowing manufacturer to offer item (eg aircraft, engine)
for sale.
type certificate data sheets Official specifications to
which each unit (aircraft, engine, propeller) commercially
offered for sale must conform (FAA).
type conversion Clearance of qualified pilot to fly
additional type of aircraft.
Typed Air Station Establishment assigned task of
providing full support for particular aircraft type, even
though based elsewhere or embarked (RN).
Type Rating Endorsement on licence specifically
qualifying holder to fly or maintain particular type of
aircraft. These are required if MTOW exceeds 12,500 lb
(5,670 kg).
type record Various books or document dossiers, some
of which have legal status, but basically complete record
of all decisions made regarding particular type of hardware,
esp. including all modifications, service difficulties,
airworthiness directives and alterations made locally, eg
on owner’s initiative.
type test Basic government test clearing engine or other
machine for production and acceptance by government
customers (UK).
TYPH Typhoon.
typhoon Tropical cyclone, revolving storm.
typical In structures and structural components, arithmetical
mean structure calculated by measuring sections
of all members actually produced.
Tyranno A Japanese high-modulus ceramic fibre.
Ty-Rap Patented nylon strap for tying and identifying
bundles (looms) of electrical wiring.
tyre Specifically for landing-gear wheels; US = tire.
tyre sizes Usual sequence of three numerical values is
overall diameter, section width (undeflected) and (if
present) inner diameter or bead size. Other measures
include Types III and VII, radial and metric. There is a
need for a uniform scheme.
Tyro Callsign prefix, when calling military or D&D: I
am inexperienced.
Tyuratam Soviet test centre for ICBMs, various other
missiles and FOBs, and launch centre for Cosmos military
satellites; location 45.8°N, 63.4°E.
T z Vertical component of thrust.
TZD True zenith distance.
TZM Titanium, zirconium, molybdenum.
TZP Ceramic comprising mix of tetragonal zirconia in
fine-grained polycrystalline zirconia.
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