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tellurium
such as rods projecting through wing skin to show
landing-gear position.
tellurium Te, semi-metal, density 6.2, MPt 450°C, metal
alloys, glass, ceramics, electronics.
Telops Telemetry on-line processing system.
TELS Turbine-engine loads simulator.
TEM 1 Transmission electron microscope (or
microscopy).
2 Technical error message (ICAO).
3 Thermally expanded metal.
4 Illustrated tool and equipment manual.
5 Threat and error management.
T/EMM Thermal and energy-management module.
TEMP, Temp 1 Temperature (ICAO).
2 Temporary.
3 Test and evaluation master plan (AFSC).
temper Degree of hardness introduced to metal by heat
treatment, cold-working or other process.
temperature Property of material systems, commonly
called intensity of heat, determining whether they are in
thermodynamic equilibrium. Normally a measure of
translation kinetic energy of atoms or molecules. SI unit
is K, not necessarily written °K. Specified as reported *, a
local actual value, or as forecast * or declared *, read from
statistical tables.
temperature accountability All factors, in aircraft
design, operation and certification determined by reduction
in propulsive thrust and wing lift caused by increase
in atmospheric temperature.
temperature coefficient Rates of change of variable per
unit change in temperature.
temperature coefficient of pressure For a given ratio of
solid-rocket-motor surface to throat area, π k = δI n P c /δ T
where I n is initial specific impulse, P c is chamber pressure
and T is temperature.
temperature correction Correction applied to bring
instrument reading to STP conditions.
temperature gradient Rate of change of temperature
with unit distance through material in direction normal to
isotherm surfaces, esp. rate of change of temperature in
atmosphere with unit increase in height.
temperature inversion See inversion.
temperature lapse rate Lapse rate.
temperature probe Sensor protruding into airstream,
giving output requiring correction to give static
temperature.
temperature recovery factor Usually, equilibrium
temperature of solid surface in high-speed flow, varying
according to turbulence of boundary layer; usually T w
and given by several formulae.
temperature-sensitive paint Thermal paint.
temperature shear Rapid change in atmospheric temperature
with horizontal or vertical travel [can cause
unacceptable change in Mach whilst holding
airspeed/altitude constant].
temperature stress Stress caused by temperature, esp.
changes in temperature between different parts of monolithic
body.
temperature traverse Series of temperature (usually
stagnation/total temperature) measures taken either over
area or along straight line perpendicular to fluid flow, eg
at exit from combustion chamber.
Tempest Transient EMP emanation standard.
template Simple pattern, usually planar, either cut to
TEP
shape of a part or with shape and dimensions marked on
surface, used as guide in repeated marking out of desired
shape. In UK occasionally written templet.
Temple-Yarwood Formula for pressure coefficient at
low Mach as function of critical Mach M c : C = 1 – 0.522
(1 + 0.2 M 2 c ) 3 /M 2 c (1 – 0.05 M 2 c ) 2 .
Tempo 1 Technical military planning operation.
2 Also TEMPO, temporary or temporarily.
temporary flight restriction Order prohibiting unauthorized
aircraft from airspace above major accident,
natural disaster or other event.
temporary revision Document printed on yellow paper
which temporarily amends an item in a maintenance
manual [now also issued electronically].
TEMS Turbine-engine monitoring system.
TEN Tactical environment network (USMC).
10base T A standard high-capacity databus (Ethernet).
Tencap Tactical exploitation of national capabilities
(US).
TEND Trend forecast.
tendency Variation with respect to time, esp. change
in atmospheric pressure in 3 h period prior to an observation.
Tenley Secure voice system for Tri-Tac, for NSA (US).
Tensabarrier Seat-belt-type barrier to control people
movements at airport (BAA); quickly closed or opened.
tensile strength Tensile force per unit cross-section
required to cause rupture.
tensile stress That produced by two external forces
acting in direct opposition tending to increase distance
between their points of application.
tensiometer Measures actual tensile stress in flexible
cable, such as flight-control circuit; can be used for
flexible bracing wires.
Tensioned Skin Patented method of assembling circularsection
structure from 3-D segment panels with skin under
tension [Aviation Traders].
tensioner Self-contained mechanism inserted into cable
carrying tensile load, eg in manual flight-control system,
which maintains desired (usually constant) tension
throughout; often in form of spring-loaded quadrants.
tension field Surface within which tensile force acts, with
direction parallel to forces. Hence * beam, eg wing spar,
within which * acts diagonally in vertical plane, tending
to pull upper and lower booms together.
tension regulator See tensioner.
tent Quasi-conical upper compartment of longendurance
balloon housing near-spherical helium cell, the
main purpose being thermal insulation.
tent-pegging Mistakenly diving into the ground (RAF
colloq.).
tenuity factor In level bombing, correction for variation
with height of atmospheric density.
TEO 1 Transferred-electron oscillator.
2 Top engine overhaul.
TEOC 1 Tactical electro-optical camera.
2 Technical-objective camera.
TEORS Tactical electro-optical reconnaissance system.
TEOS Technologies for energy-optimised systems.
TEOSS, Teoss 1 Tactical emitter operational support
system; EW locator (USAF).
2 Tracking electro-optical sensor suite.
TEP Tactical electronic plot.
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