Pilot/Controller Glossary

TARMAC DELAY- The holding of an aircraft on the
ground either before departure or after landing with
no opportunity for its passengers to deplane.
TARMAC DELAY AIRCRAFT- An aircraft whose
pilot-in-command has requested to taxi to the ramp,
gate, or alternate deplaning area to comply with the
Three-hour Tarmac Rule.
TARMAC DELAY REQUEST- A request by the
pilot-in-command to taxi to the ramp, gate, or
alternate deplaning location to comply with the
Three-hour Tarmac Rule.
TAS-
(See TERMINAL AUTOMATION SYSTEMS.)

TAWS-
(See TERRAIN AWARENESS WARNING
SYSTEM.)

TAXI- The movement of an airplane under its own
power on the surface of an airport (14 CFR
Section 135.100 [Note]). Also, it describes the
surface movement of helicopters equipped with
wheels.
(See AIR TAXI.)
(See HOVER TAXI.)
(Refer to 14 CFR Section 135.100.)
(Refer to AIM.)

TAXI PATTERNS- Patterns established to illustrate
the desired flow of ground traffic for the different
runways or airport areas available for use.
TCAS-
(See TRAFFIC ALERT AND COLLISION
AVOIDANCE SYSTEM.)

TCH-
(See THRESHOLD CROSSING HEIGHT.)

TCLT-
(See TENTATIVE CALCULATED LANDING
TIME.)

TDLS-
(See TERMINAL DATA LINK SYSTEM.)
TDZE-
(See TOUCHDOWN ZONE ELEVATION.)

TELEPHONE INFORMATION BRIEFING SERVICE- A continuous telephone recording of
meteorological and/or aeronautical information.
(Refer to AIM.)

TEMPORARY FLIGHT RESTRICTION (TFR)- A
TFR is a regulatory action issued by the FAA via the
U.S. NOTAM System, under the authority of United
States Code, Title 49. TFRs are issued within the
sovereign airspace of the United States and its
territories to restrict certain aircraft from operating
within a defined area on a temporary basis to protect
persons or property in the air or on the ground. While
not all inclusive, TFRs may be issued for disaster or
hazard situations such as: toxic gas leaks or spills,
fumes from flammable agents, aircraft accident/incident sites, aviation or ground resources engaged in
wildfire suppression, or aircraft relief activities
following a disaster. TFRs may also be issued in
support of VIP movements, for reasons of national
security; or when determined necessary for the
management of air traffic in the vicinity of aerial
demonstrations or major sporting events. NAS users
or other interested parties should contact a FSS for
TFR information. Additionally, TFR information can
be found in automated briefings, NOTAM publications, and on the internet at http://www.faa.gov. The
FAA also distributes TFR information to aviation
user groups for further dissemination.
TENTATIVE CALCULATED LANDING TIME
(TCLT)- A projected time calculated for adapted
vertex for each arrival aircraft based upon runway
configuration, airport acceptance rate, airport arrival
delay period, and other metered arrival aircraft. This
time is either the VTA of the aircraft or the
TCLT/ACLT of the previous aircraft plus the AAI,
whichever is later. This time will be updated in
response to an aircraft"s progress and its current
relationship to other arrivals.
TERMINAL AREA- A general term used to describe
airspace in which approach control service or airport
traffic control service is provided.
TERMINAL AREA FACILITY- A facility providing air traffic control service for arriving and
departing IFR, VFR, Special VFR, and on occasion
en route aircraft.
(See APPROACH CONTROL FACILITY.)
(See TOWER.)

TERMINAL AUTOMATION SYSTEMS (TAS)-
TAS is used to identify the numerous automated
tracking systems including ARTS IIE, ARTS IIIA,
ARTS IIIE, STARS, and MEARTS.
TERMINAL DATA LINK SYSTEM (TDLS)- A
system that provides Digital Automatic Terminal