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Townsend avalanche
though usually with tube around inner side of leading
edge [Dr H C H Townend, 1929].
Townsend avalanche Cascade multiplication of ions in
gas-filled counting-tube technology.
Townsend coefficients In DC gas-discharge, First ** =
η = number of electron/ion pairs per volt; Second ** = γ
= number of secondary electrons emitted from cathode
per impacting positive ion.
Townsend discharge DC discharge between two electrodes
immersed in gas and requiring cathode electron
emission.
Townsend ionization coefficients Average number of
ionizing collisions electron makes in drifting unit distance
along applied field.
tow-reeling machine Powered winch for winding in cable
towing aerial target or other device.
tow rope Connection between tug and glider, in WW2
typically 9 in [229 mm] or 10 in [254 mm] (circumference).
Manila [hemp], later replaced by Nylon. See cable.
tow tractor Usually means prime mover for towing
aircraft or baggage train.
Toxic-B Most common lethal air-dropped or dispensed
war agent (USSR).
TP 1 Turning point.
2 Thermoplastics.
3 Test pilot, or point.
4 Target, or training, practice.
5 Teleprinter.
6 Terminal processor.
7 Traffic pattern; A adds altitude.
8 Turbulence plot.
9 Technical Publication[s]
10 Tactics planner.
11 Two-seat pursuit (USA 1919–24).
12 Telecommunication [singular] processor.
13 Trajectory prediction (ATC).
Tp 1 Tailplane trim [actuator].
2 Tropical Pacific.
TPA 1 Target-practice ammunition.
2 Traffic-pattern altitude.
3 Taildragger Pilots’ Association (US).
4 Trigger-pulse amplifier [D adds driver].
5 Taxi position awareness (Jeppesen).
TPAR 1 Tactical penetration-aid rocket, carrying
expendable ECM payloads.
2 Trans-polar air route.
TPAWS Turbulence prediction and warning system
(NASA).
TPC 1 Total programme cost(s).
2 Tactical pilotage chart.
3 Temperature- [or thermally-] protective coating.
4 Technical Partnership Canada.
TPCI Technical publications combined index.
TPD Tracking processing device.
TPDA Transmitting personal digital assistant.
TPDR Transponder (more often TXP or XPDR).
TPDU Transport Protocol data unit.
TPE 1 Tracking and pointing experiment.
2 Thermoplastic elastomer.
TPED Tasking, processing, exploitation and dissemination
(Imint).
TPF 1 Terminal phase, final.
2 Technology performance financing.
3 Terrestrial-planet finder.
TR, Tr
TPFDD Time-phased force and deployment data.
TP4 Transport Protocol Class 4.
TPFP Target-practice frangible projectile [-T adds
-tracer].
TPFT Tunable pipelined frequency transform.
TPG 1 TV picture generator, Tepigen.
2 Technology planning guide.
3 Topping.
T-phi, Tφ T-S.
TPI 1 Terminal phase initiation.
2 Third-part[y] insurance.
t.p.i. Turns (or threads) per inch.
TPIS Tyre-pressure indicating system.
TPL 1 Transmitted pulse length.
2 Terminal permission list (Acars/Afeps).
TPM 1 Terrain profile matching, or mode.
2 Technical performance management.
TPMU Tyre-pressure monitor[ing] unit.
TPN Technical procedure notice; (L) adds electronic.
TPP 1 Tip-path plane [see tpp].
2 Total-package procurement (C adds concept).
3 Technology program plan (AFSC).
4 Terminal procedures publication.
5 Tri-phenyl phosphate, extreme-pressure anti-scuff oil
additive.
tpp Tip-path plane, hence α tpp for helicopter AOA.
TPPX Target-practice proximity-fuzed.
TPR 1 Terrain profile recorder.
2 Thermoplastic rubber.
3 Transponder [XPDR preferred].
4 Transient-phase restoration.
5 Turbofan pressure ratio.
TPRM Trusted protocol reference model.
TPS 1 Thermal protection system.
2 Test program set.
3 Technical problem-solving.
4 Thermal picture synthesizer.
5 Test Pilot School (USAF).
6 Tactical processing system.
TPSA Technologies, processes and system attributes.
TPSRS Terminal primary and secondary radar
system(s).
TPT, TP/T 1 Target practice, tracer.
2 Transonic pressure tunnel.
Tpt Transport.
TPTA Tailplane trim actuator.
TPTO Temporary permission to operate.
TPU 1 Terminal position update (RV).
2 Tactical, or transmitter, or transceiver, processing
unit.
3 Turbine power unit (Gripen).
TPWG Test planning working group.
TPWS Turbine prediction and warning system.
TPX-42 Numeric decoder of aircraft beacons.
TQ Total quality; C adds cost, E engineering, M
management, PP planning and producibility and S
supportability.
TQA Throttle-quadrant assembly.
TR, Tr 1 Track.
2 Thrust reverser.
3 Tracking rate.
4 Tactical reconnaissance (US, role prefix).
5 Torpedo reconnaissance (UK, defunct).
6 Technical report, or readiness.
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