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of his/her responsibility to see and avoid other
aircraft. Pilots are cautioned that there are many
times when the controller is not able to give traffic
advisories concerning all traffic in the aircraft's
proximity; in other words, when a pilot requests or
is receiving traffic advisories, he/she should not
assume that all traffic will be issued.
(Refer to AIM.)
TRAFFIC ALERT (aircraft call sign), TURN
(left/right) IMMEDIATELY, (climb/descend) AND
MAINTAIN (altitude).
(See SAFETY ALERT.)
TRAFFIC ALERT AND COLLISION AVOIDANCE
SYSTEM- An airborne collision avoidance
system based on radar beacon signals which operates
independent of ground‐based equipment. TCAS‐I
generates traffic advisories only. TCAS‐II generates
traffic advisories, and resolution (collision avoidance)
advisories in the vertical plane.
TRAFFIC INFORMATION-
(See TRAFFIC ADVISORIES.)
TRAFFIC IN SIGHT- Used by pilots to inform a
controller that previously issued traffic is in sight.
(See NEGATIVE CONTACT.)
(See TRAFFIC ADVISORIES.)
TRAFFIC MANAGEMENT ADVISOR (TMA)- A
computerized tool which assists Traffic Management
Coordinators to efficiently schedule arrival traffic to
a metered airport, by calculating meter fix times and
delays then sending that information to the sector
controllers.
TRAFFIC MANAGEMENT PROGRAM ALERTA
term used in a Notice to Airmen (NOTAM) issued
in conjunction with a special traffic management
program to alert pilots to the existence of the program
and to refer them to either the Notices to Airmen
publication or a special traffic management program
advisory message for program details. The contraction
TMPA is used in NOTAM text.
TRAFFIC MANAGEMENT UNIT- The entity in
ARTCCs and designated terminals directly involved
in the active management of facility traffic. Usually
under the direct supervision of an assistant manager
for traffic management.
TRAFFIC NO FACTOR- Indicates that the traffic
described in a previously issued traffic advisory is no
factor.
TRAFFIC NO LONGER OBSERVED- Indicates
that the traffic described in a previously issued traffic
advisory is no longer depicted on radar, but may still
be a factor.
TRAFFIC PATTERN- The traffic flow that is
prescribed for aircraft landing at, taxiing on, or taking
off from an airport. The components of a typical
traffic pattern are upwind leg, crosswind leg,
downwind leg, base leg, and final approach.
a. Upwind Leg- A flight path parallel to the
landing runway in the direction of landing.
b. Crosswind Leg- A flight path at right angles to
the landing runway off its upwind end.
c. Downwind Leg- A flight path parallel to the
landing runway in the direction opposite to landing.
The downwind leg normally extends between the
crosswind leg and the base leg.
d. Base Leg- A flight path at right angles to the
landing runway off its approach end. The base leg
normally extends from the downwind leg to the
intersection of the extended runway centerline.
e. Final Approach. A flight path in the direction of
landing along the extended runway centerline. The
final approach normally extends from the base leg to
the runway. An aircraft making a straight‐in approach
VFR is also considered to be on final approach.
(See STRAIGHT‐IN APPROACH VFR.)
(See TAXI PATTERNS.)
(See ICAO term AERODROME TRAFFIC
CIRCUIT.)
(Refer to 14 CFR Part 91.)
(Refer to AIM.)
TRAFFIC SITUATION DISPLAY (TSD)- TSD is a
computer system that receives radar track data from
all 20 CONUS ARTCCs, organizes this data into a
mosaic display, and presents it on a computer screen.
Pilot/Controller Glossary 2/14/08
PCG T-6
The display allows the traffic management coordinator
multiple methods of selection and highlighting of
individual aircraft or groups of aircraft. The user has
the option of superimposing these aircraft positions
over any number of background displays. These
background options include ARTCC boundaries, any
stratum of en route sector boundaries, fixes, airways,
military and other special use airspace, airports, and
geopolitical boundaries. By using the TSD, a
coordinator can monitor any number of traffic
situations or the entire systemwide traffic flows.
TRAJECTORY- A URET representation of the path
an aircraft is predicted to fly based upon a Current
Plan or Trial Plan.
(See USER REQUEST EVALUATION TOOL.)
TRAJECTORY MODELING- The automated process
of calculating a trajectory.
TRANSCRIBED WEATHER BROADCAST- A
continuous recording of meteorological and aeronautical
　
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