Pilot/Controller Glossary

nonthreatening/nonhostile; TOI was identified based
on specific and credible intelligence that was later
determined to be invalid or unreliable; or displayed
data is identified and characterized as invalid.
TRAFFIC-
a. A term used by a controller to transfer radar
identification of an aircraft to another controller for
the purpose of coordinating separation action. Traffic
is normally issued:
1. In response to a handoff or point out,
2. In anticipation of a handoff or point out, or
3. In conjunction with a request for control of an
aircraft.
b. A term used by ATC to refer to one or more
aircraft.
TRAFFIC ADVISORIES- Advisories issued to alert
pilots to other known or observed air traffic which
may be in such proximity to the position or intended
route of flight of their aircraft to warrant their
attention. Such advisories may be based on:
a. Visual observation.
b. Observation of radar identified and nonidentified aircraft targets on an ATC radar display, or
c. Verbal reports from pilots or other facilities.
Note 1: The word "traffic" followed by additional
information, if known, is used to provide such
advisories; e.g., "Traffic, 2 o"clock, one zero miles,
southbound, eight thousand."
Note 2: Traffic advisory service will be provided to
the extent possible depending on higher priority
duties of the controller or other limitations; e.g.,
radar limitations, volume of traffic, frequency
congestion, or controller workload. Radar/
nonradar traffic advisories do not relieve the pilot
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 (TCAS)- 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 INFORMATION SERVICE-BROADCAST (TIS-B)- The broadcast of ATC derived
traffic information to ADS-B equipped (1090ES or
UAT) aircraft. The source of this traffic information
is derived from ground-based air traffic surveillance
sensors, typically from radar targets. TIS-B service
will be available throughout the NAS where there are
both adequate surveillance coverage (radar) and
adequate broadcast coverage from ADS-B ground
stations. Loss of TIS-B will occur when an aircraft
enters an area not covered by the GBT network. If this
occurs in an area with adequate surveillance coverage
(radar), nearby aircraft that remain within the
adequate broadcast coverage (ADS-B) area will view
the first aircraft. TIS-B may continue when an
aircraft enters an area with inadequate surveillance
coverage (radar); nearby aircraft that remain within
the adequate broadcast coverage (ADS-B) area will
not view the first aircraft.
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 PROGRAM ALERT-
A 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