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TTCP
TTCP The Technical Co-operation Program[me]
(US/UK).
TTCR 1 Time/temperature cycle recorder, or recording.
2 Triangular trihedral corner reflector.
TTCS Tactical terminal, or target-tracking, control
system.
TTD Tactical-threat display.
TTDF Tip-turbine-driven fan.
TTE 1 Tooling and testing equivalency working group
(AMC).
2 Total time on engine.
TTEMP Temperature test and evaluation master plan.
TTF 1 Time to first fix.
2 Tanker task force.
3 Threat training facility (US).
4 Target-towing flight.
5 Torpedo Training Flight.
TTFF Time to first fix.
TTG Time to go, range divided by closing speed.
t θ T-theta, panel thickness required to avoid buckling in
torsion.
T θ2 T–theta–2, numerator time-constant.
TTI 1 Triple torque indicator.
2 Time/temperature indicator.
TTL 1 Transistor/transistor logic; IC adds integrated
circuit.
2 Torpedo-tube launch.
TTLS Transportable-transponder landing system.
TTM Tape-transfer magazine.
TTNT Tactical-targeting network technology, or technologies.
TTP 1 Time to protection, measured from firing chaff,
aerosol, flare or other dispensed payload to time aircraft
can be judged protected.
2 Through-thickness pinning.
3 Time-triggered protocol.
4 Tactics, techniques and procedures (USA).
TTR 1 Target-tracking radar.
2 Twin tandem rotors (helicopter).
3 TCAS-II transmitter/receiver.
4 Tonopah Test Range, Utah.
TTRJ Thermally throated ramjet.
TTS 1 Time to station; time in minutes to fly to tuned
DME station. Often a selectable mode on DME panel
instrument.
2 Technology Transfer Society (US).
3 Thin-tape system.
4 Total technical service (MRO), or support.
5 Total training system.
TTSMOH Total time since major overhaul.
TTSN Total time since new.
TTT 1 Tactical technical requirement(s), basis of each
military specification (USSR, R).
2 Tailplane trim[ming] tank.
3 Template-tracing technique.
TTTD Tactile torso display device [not TTDD] (USAF
Academy).
TTTO, T 3 O Two stage[s] to orbit.
TTTS Tanker/transport training system.
TTU 1 Triplex transducer unit feeding height, TAS and
Mach to CSAS.
2 Torpedo Training Unit (RAF).
TTW Time of tension to war, or transition to war.
TTWL Twin-tandem wheel loading.
tulip
T 2 CAS Combined TCAS/TAWS.
TTWS Terminal threat warning system.
TTY Telephone/teletypewriter.
TU Towed unit.
T u Ultimate value of torque.
TuAF Turkish air force [UK usage].
TUAV Tactical unmanned air, or aerial, vehicle [R adds
radar].
tub Tub section has been used to describe lower rear half
of main fuselage structure of pod/boom helicopters.
Tuballoy Depleted uranium.
tube 1 Vacuum tube (UK = thermionic valve).
2 Large modern jetliner (colloq.).
tube oil Liquid primer for hot-coating interior of inaccessible
workpieces.
tube yawmeter Array of four (or five if one in centre)
pitot tubes each inclined at about 45° to flow and radially
spaced at 90° so that dP across each opposite pair gives
flow inclination in that plane; provides complete picture
of local flow direction, little affected by yaw up to 15°.
Tubitak Scientific research board [acronym] (Turkey).
tubo-annular Gas-turbine combustor of annular type
within which are separate tubular flame tubes. Latter are
sometimes linked into common turbine NGV ring.
tubular combustor Gas-turbine combustion chamber
whose upstream part is of essentially circular cross-section
with central fuel burner. Engine may have one or more
(early turbojets had as many as 16 because true annular
technology unknown).
tubular rivet Rivet whose shank is a tube, usually
inserted on central mandrel which on withdrawal closes
upset head.
tubulators Numerous open tubes in surface of sailplane
wing in hope of sustaining a laminar boundary-layer.
tuck, tuck in 1 Tendency to tighten turn, without pilot
command.
2 At high Mach numbers, uncommanded nose-down
pitching moment, also called Mach *; could be violent to
point of causing structural failure [the opposite of (1)].
tuck derivative C mv , mathematical expression for tuck2,
numerically equal to M(δCm/δM).
tuck-under Strong tendency to dive, especially at high
Mach number.
tufting Covering aircraft, model or portion thereof with
tufts.
tufts Short pieces of wool, thread or other very light,
flexible and easily visible material which give qualitative
picture of local airflow direction and (from steadiness or
oscillatory motion or turbulence) vorticity or turbulence.
Mounted on aircraft or model skin or at varying distances
from it.
tug 1 Self-contained propulsion system for long-term
use in space tasked with taking payloads, satellites, spacecraft
and portions of station structure, propellants and
other supplies (eg delivered by Shuttle Orbiter) and
placing them in desired locations or trajectories. Intention
is to attach * to all types of payload, in various ways giving
thrust without rotation, and to replenish propellants in
space.
2 Aeroplane for towing glider, target or other unpowered
object. Hence * pilot, * queue, * landing area.
tugging Towing a target (colloq.).
TUGRIT Turkey, Greece, Italy radar assistance service.
tulip Spray of fuel from gas-turbine airspray-type
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