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traffic circuit
conceived, exists in two levels. TCAS I is the baseline
system which merely senses potentially conflicting traffic
and warns crew [by traffic advisory]. TCAS II additionally
provides traffic information within c30 nm [55 km],
and two conflicting equipped aircraft are manoeuvred
apart.
traffic circuit See Circuit.
traffic density The number of xpdr-equipped aircraft
[excluding one’s own] within R nm [1.85R km] π R 2 .
traffic information, radar Information issued to alert
aircraft to radar target observed on ground radar display
which may be in such proximity to its position or intended
route as to warrant its attention.
traffic lights Any red/amber/green presentation,
especially that by a radar altimeter referenced to a preselected
low (minimum safe) height setting.
traffic pattern See circuit; * usually used for
tracks/profiles of arrivals and departures of non-GA
traffic, ie military or commercial.
traffic situation display TMS (3) tool for monitoring
position of traffic to determine demand on airports and
sensors.
TrAG Training air group (RN, WW2).
trail 1 Relative motion of dropped store, eg free-fall
bomb, behind aircraft flying at constant V, broken down
into * distance, cross-*, range component of *, * angle,
cross-* angle, and range component of cross-*.
2 Distance between centre of tyre contact area with
ground and intersection with ground of free castoring
axis; not relevant to power-steered aircraft.
3 To shadow another aircraft or hostile ship(s).
4 Tendency of freely hinged (ie, not irreversible) control
surface to align itself with relative wind. Normally negative,
surface ‘floating’ in line with wind, but an
overbalanced surface has positive * and unless restrained
will be blown to limit of its deflection.
5 To fly a tanker behind potential receivers.
6 To extend tanker’s hose.
trail angle 1 Angle between vertical and line joining
bomb impact to aircraft at time of impact.
2 Several angles in landing gear, including acute angle
between bogie beam and aircraft horizontal plane (negative
when front axle is lower than rear) and acute angle
between local aircraft vertical and axis of main-gear oleo
strut (often not relevant because of gear geometry).
trail blade That immediately following in same stage of
engine fan, compressor or turbine, especially following a
blade that breaks off.
trail distance Horizontal distance between point of
bomb impact and point vertically below aircraft at time of
bomb impact.
trailer 1 Aircraft following and keeping under surveillance
a designated airborne contact (DoD).
2 General US term for towed road vehicle, esp. for
human occupancy.
trail formation In direct line-ahead, each aircraft or
element being directly in front of those following.
trailing aerial Aerial [antenna] in form of long wire,
usually with weight or drogue on end, capable of being
wound in or out from underside of aircraft.
trailing area Area of flight control or other pivoted
surface on aircraft downwind of hinge axis.
trailing blade Trail blade (US usage).
trajectory shift
trailing edge 1 Rear edge of aerofoil or streamlined
strut.
2 Outline of pulse as amplitude falls from peak to zero
or minmum positive value.
trailing finger Extra electrode in piston-engine magneto
distributor which transmits large current from booster
magneto to cylinder next in firing order when engine is
started.
trailing flap Not a normal term but could be applied to
Junkers double wing.
trailing link Landing gear in which axle [or pivot of
bogie beam] is carried by arm pivoted to rear of leg. Also
called levered suspension.
trailing sweep Sweep (5) when deviation is towards
trailing edge.
trailing vortex Vortex extending downstream from
point on body.
trailing vortex drag See lift-induced drag.
trail length Length of cable connecting aircraft to
braking parachute, anti-spin parachute or other drag
device.
trail line That between aircraft in level flight and bomb
released from it. Projected, it reaches trail point.
trail point Where trail line reaches Earth’s surface.
trail rope 1 Trailed by balloon over ground to reduce
groundspeed and assist in regulating height.
2 Carried in airship for ground handling.
train 1 Bombs dropped in short intervals or sequence
(DoD).
2 Single tug towing several gliders on single towrope or
series of ropes.
train bombing Two or more bombs released at predetermined
interval from one aircraft as result of single
actuation of release mechanism (USAF).
trainer Aircraft for training flight personnel, esp. pilots.
training aids Items whose primary purpose is to assist
instruction and growth of operator skill/familiarity, such
as publications, tapes, films, mimic boards, systems rigs,
procedure trainers and simulators.
training package Self-contained arrangement to train
personnel (eg of an air force or of purchaser of GA
aircraft) for fixed fee or fixed outlay per month; may
include design of trainer, construction of facilities as
turnkey contract or part of larger programme.
trajectory Flightpath in 3-D of any object, eg aeroplane
or electron or other particle, with exception of orbits and
other closed paths. Can be ballistic, acted on only by
atmospheric drag and gravity, or controlled by various
external forces.
trajectory band Webbing strip round top of aerostat
envelope to reduce distortion.
trajectory plotting A particular meaning is using a
wreckage field and knowledge of winds at all relevant
altitudes to establish point in sky at which an aircraft
broke up.
trajectory scorer Instrument carried by aerial target
which continuously defines position of intercepting
missile in sphere whose centre coincides with origin of
target’s co-ordinate axes; readout is time-history record of
missile range and angular position commensurate with
scoring requirements.
trajectory shift Distance or angular measure of deviation
of missile from ballistic trajectory under influence of
a thrust mechanism (ASCC).
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