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transistor amplifier
connected to p-type material, separated from other p-type
electrode (called collector) by layer of n-type.
transistor amplifier Amplifier employing one or more
transistors arranged in any of several configurations, eg
common-emitter, common-collector or common-base.
transit 1 Passage of celestial body across meridian.
2 Passage of one aircraft through controlled airspace.
3 Instrument used to determine (1).
4 Apparent passage of celestial body across face of
another.
5 Condition in which three points are aligned, eg
observer and two objects on Earth’s surface, prefaced by
‘in’ (ie said to be in *).
6 Period spent on ground by passenger between
arriving on one flight and departing on another, hence *
area, * trollies etc.
7 A passenger in transit (6).
8 Period spent on ground by aircraft, especially
commercial transport, between flights; the most frequent
interval written into schedules for maintenance. Also
defined as turnaround stop enroute.
9 Motion of landing gear during retraction or
extension.
transit bearing Measuring time at which two surface
features have same (measured) bearing from aircraft in
flight.
transit mode Configuration of mobile system, eg SAM
missile, radars and support facilities, for moving on
ground to new location with radars folded, missiles
packed, launchers at 0° elevation and doors closed, etc.
transition 1 One meaning in aerospace is change from
jet-supported VTOL flight to wing-borne translational
flight and vice versa.
2 Another is sudden switch from blind instrument
approach to visual on first sighting ground, e.g. runway
lights.
3 Another is SID to airway and thence to Star.
transitional surface Specified surface sloping up and out
from edge of approach surface and from line originating
at end of inner edge of each approach area, drawn parallel
to runway centreline in direction of landing (ICAO).
transition altitude QNH, altitude in vicinity of airfield at
or below which aircraft control in the vertical plane is
referred to true altitude; e.g., in London TMA, 6,000 ft.
(see transition level).
transition distance Ground distance covered in
transition (1 or 2).
transition down Change in helicopter flight level to dunk
sonobuoy in sea in ASW operation.
transition envelope That portion of flight envelope in
which trimmed controllable flight is possible in powered
flight regime, bounded by airspeed, height, ROC, power,
conversion angle, AOA, control margins, etc (USAF).
transition flight Flight at TAS below power-off stall
speed, where lift is derived from both wing and powerplant.
transition height QFE, at or below which altitude is
referred to that of airfield.
transition layer Airspace between transition level and
transition altitude (NESN).
transition level QNE, lowest flight level available for use
above transition altitude (DoD).
transition lift parameter For jet VTOL, L/TAj/S,
translunar
where L is wing lift, T is jet lift, Aj is jet area (total) and S
is wing area.
transition manoeuvre Aeroplane manoeuvre linking two
glidepaths or approach trajectories; unusual except at
airports where approach has to be on instrument runway
and actual landing on a parallel runway.
transition point Point on 2-D aerofoil or other surface at
which boundary layer changes from laminar to turbulent,
extremely sensitive to surface roughness, temperature
difference, steadiness of upstream flow and other factors,
and difficult to locate accurately in model testing.
transition strip Area of airfield adjacent to runway or
taxiway suitably paved to allow aircraft to taxi across it in
all weathers.
transition temperature Many meanings in which particular
temperature-dependent change takes place, but
esp. temperature range in which metal ductility or fracture
mode changes rapidly.
transition up Change in helicopter flight level to pull
sonobuoy out of water.
transition zone 1 Narrow atmospheric region along
front where characteristics change rapidly, values lying
between those of dissimilar air masses on either side.
2 Short section of glidepath within which average pilot
makes transition from IFR to visual.
transitron Pentode oscillator with negative resistance
and near-constant sum of anode/screen current.
transit time 1 Elapsed time between instant of filing
message with AFTN station for transmission and instant
it is made available to addressee.
2 Elapsed time between electrodes in valve or other
device for any electron.
translating Moving in straight line relative to surroundings.
translating centrebody Supersonic-inlet centrebody able
to move linearly into or out of inlet under control of
automatic control system.
translating nozzle Jet engine nozzle which in reverse
mode moves to rear, further from engine, opening gap in
jetpipe for gas deflected by reverser clamshells.
translation Motion in more or less straight line, from A
to B, with no rotation about any axis.
translational flight Flight at sensible airspeed, such that
wing generates lift; loosely from A to B, moving under
power from one place to another.
translational lift Additional lift gained by helicopter in
translational flight resulting from induced airflow
through main rotor(s) gained from forward airspeed.
translation bearing Mechanical bearing permitting
sliding motion, eg air-cushion pad or oilfilm bearing.
translation rocket Separation or staging rocket.
translatory resistance derivatives Those expressing
moments and forces caused by small changes in translational
velocity.
transloader Vehicle for transporting missiles [invariably
SAMs] and loading them on or into launchers.
Transloc Transportable (ground station) Loran-C.
translucent Permitting EM radiation, esp. light, to pass
through but diffused in direction.
translucent rime See glazed ice.
translunar Different definitions; most authorities agree
word means extending from Earth to just beyond Moon,
but a minority claim it excludes all space inside lunar
orbit.
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