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to view Definitions of Aircraft Options
T
TA - Traffic advisory (TCAS)
TBO - Time between overhaul
TCAS - Traffic Collison Avoidance
System. TCAS-I provides warnings (TAs) of other nearby
aircraft; TCAS II provides warnings and resolutions
advisories (RAs), and coordinates RAs with other TCAS II
equipped aircraft via Mode S transponder.
TKE - Track error.
T/Rs - Thrust Reversers
Trend Monitoring - Continuous
computerized observation of turbine engine performance. Used
to detect early sings of wear.
TSC - Total Time Since CORE
TSN - Time Since New (also
TTSN)
TSO - Technical standard order. A performance
specification and production compliance criteria applied to
avionics and defined by FARs and the RTCA.
TT - Total Time Airframe
TTG, TTS or TTW - Time to go, time to station, time
to waypoint.
Turbo prop - Is said of an airplane powered by a
type of jet engine, the turbo prop, equipped with a
turbine-driven propeller.
Turbulence mode - Flight control system
mode in which a "softer" response to gust upsets
is programmed.
TX - Transponder
U
Undercarriage strut - A part of an airplane's
structure, designed to resist distortion, which supports the
landing gear.
Usable Fuel (lbs) = Usable fuel (gallons) x
6.7 lbs/gallon
Useful Load = Maximum Ramp Weight - (minus)
Basic Operating Weight
UTC - Universal Coordinated Time.
V
VAC - Volts alternating current.
VDC - Volts direct current.
VFR - Visual Flight Rules. Private Pilots start as
VFR certified. This means that, in most cases,they must have
about 3 miles of visibility, be 500 feet below clouds, 1000
feet above clouds, and/or 2000 feet next to clouds at a bare
minimum. Unless they have an Instrument Rating (and all the
associated control along with that...see IFR), they are
required to avoid all clouds and weather.
VHF - Very High Frequency radio equipment.
VLF - Very Low Frequency
VNAV - Vertical navigation, or the
capability to compute pitch-axis maneuvers and
altitude-related points in space.
VOR - VHF Omnidirectional Receiver. One of the more
common navigational aids that the FAA has dropped all over
the country (and sometimes the world). A VOR sends out a
radio signal that is slightly different in each direction
(the difference is phase, if you want to get technical). So,
an airplane's VOR tool listens to the VOR, and by measuring
the difference in the radio, it can tell which direction it
is from the VOR. Since your chart will show where the VOR
is, and you now know where you are in relation to the VOR,
it has helped you figure out where in the local area you
might happen to be.
W
WAAS - GNSS wide-area augmentation system.
wet wings - Method for containing fuel in wings
without using rubber fuel cells.
wing fence - Term preferred by Airbus and
McDonnell-Douglas aircraft manufacturers for the vertical
structures at the outside ends of the wings of some of their
jets. More at winglet.
winglet - Term preferred by Boeing for the
vertical structures at the ends of the wings on their
747-400. Airbus and McDonnell-Douglas aircraft manufacturers
use the term ``wing fence.'' The 747-400 winglets only rise
from the end of the wing. MD-11 and Airbus wing fences
extend both above and below the wing.
WPT - Waypoint.
X
xpond - Transponder
X-band - Frequency range in which most
general aviation weather radars operate.
XTK - Cross track; cross track error.
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