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trimode scanner
liquids) located as far as possible from c.g. between which
fuel can be pumped to achieve desired trim in pitch, eg in
SST at subsonic or supersonic speed.
trimode scanner Circular aerial (antenna) using three
EM modes in microwave cavity to move amplitude distribution
in azimuth to scan 360°.
trim size Finished size of map or chart sheet.
trim speed Precise value of N 2 , adjusted to ISA sea level,
for particular engine; recorded by many manufacturers on
data plate. It can correspond to MIL, rated thrust or some
other power.
trim tab Small hinged portion of trailing edge of primary
flight-control surface whose setting relative to surface is
set by pilot via screwthread, powered trimmer actuator or
other system preventing subsequent rotation under air
loads and whose effect is to hold main surface in desired
neutral position for trimmed flight.
trim tank See trimming tanks.
trim template Template used for marking finished shape
of part already formed (eg in press) but not trimmed.
trinitrophenol Yellow crystalline high explosive.
triode Thermionic valve containing cathode, anode and
control grid.
trip 1 One complete flown sector; hence * time, * fuel.
2 To activate an electrical circuit-protection system, or
action thus triggered, eg overvoltage *.
triplane 1 Traditionally, aeroplane with three main
lifting surfaces, in practice superimposed but not required
by definition.
2 In modern usage, aeroplane with foreplane and
tailplane.
triple Triple seat unit.
triple-A Anti-aircraft gunfire or defences, from AA
artillery (colloq.).
triple display indicator Shows Mach, KEAS and altitude.
triple ejector rack Rack for carrying and forcibly
ejecting three dropped stores.
triple-H Hot, high, humid (all reduce takeoff performance).
triple modular redundancy Majority-vote redundancy by
three parallel systems.
triple-output GPU Normally means electrical supply
offers three voltages, eg 28 V DC, 115 and 415 V AC.
triple point 1 Unique thermodynamic equilibrium value
of temperature/pressure at which substance can exist as
solid, liquid and vapour.
2 In any diametral vertical section through NW air
burst, intersection of incident, reflected and fused (Mach)
shock fronts; height above surface (called Mach stem)
increases with distance from GZ (DoD).
triple pressure gauge On British aircraft 1932–60 showed
pneumatic brake system pressure and actual pressure at
each main wheel.
triple release Release of three free-fall bombs at short
intervals, with middle one intended to be on target
(suggest arch.).
triple seat Passenger seat unit for three persons side-byside.
triple-tandem Actuator of tandem type with three
actuation sections.
triple torque indicator Vertical scales on AMLCD show
engine output and main/tail-rotor torque.
triplex Among many meanings, use of three parallel
systems with minimal or zero interconnection to provide
majority-vote redundancy; such triple redundancy
provides for continued operation after single failure
(SFO/FS operation). In * detection/correction system one
channel may be a model.
triplexer Dual duplexer allowing one aerial to feed two
radar receivers simultaneously, both isolated during
transmission of each pulse.
trip line Cable or thin rope attached to far end of seaanchor
drogue which when pulled spills out contents to
allow drogue to be wound back on board.
tripod Vectored-thrust turbofan with one hot and two
cold nozzles.
TriSar Triple-mode synthetic-aperture radar.
TRIT Turbine (usually HP) rotor inlet temperature.
Tri-Tac Tri-service tactical communications (DoD).
tritium Unstable radioactive isotope of hydrogen of
mass number 3, crucial component of NW fusion
materials such as Pu, Li-6 and deuterium.
TRIXS Tactical reconnaissance intelligence exchange
system, or service.
TRJ Tactical radar jammer.
TRK, Trk Track.
TRL 1 Tyre rolling limit; upper right boundary of aeroplane
takeoff performance carpet.
2 Thrust-reduction limit in flexible takeoff.
3 Transition level.
4 Technology readiness level.
TRM
1 Technical requirements manual.
2 Training and readiness manual (US).
3 Team resource management.
4 Tow-reeling machine.
tropical air mass
T/RM Transmit and receive module, or manifold.
Tr(M) Magnetic track.
TRML Terminal.
TRMM Tropical-rainfall measuring , or measurement,
mission.
TRN 1 Terrain-reference(d) navigation [S adds system].
2 Terminal radar numeric.
TRO Technical resources operation.
trochoid Path traced by point on circle which rolls along
straight line. Commonest RC engine pistons are of related
profiles.
TROF Trough.
troland Unit of retinal illuminance; that produced by
viewing surface whose luminance is 1 cd/m 2 through artificial
pupil of 1 mm 2 area centred on natural pupil. E (in *)
= LA (in nits × mm 2 ).
trolley-acc Pronounced trolley-ack, 12-V or 28-V
accumulator on two-wheel mount for starting aircraft.
trolley dolly Stewardess (colloq., suggest derogatory).
troll(ing) Flying of random pattern by EW/Elint/ECM
aircraft to try to trigger and detect hostile emissions.
trombone Adjustable U-shaped length of waveguide or
co-axial line used for phasing.
trombone lever Cockpit lever with linear trombone-like
movement, eg F-111 wing sweep.
tromboning See path stretching.
troop carrier Aircraft designed or converted for carrying
troops, with or without provision for other loads, or for
departure by parachute.
TROP Tropopause.
tropical air mass Warm air originating at low latitudes,
esp. in subtropical high-pressure system.
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