Pilot/Controller Glossary

4/3/14

PCG T−2

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 SER-

VICE− 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/in-

cident sites, aviation or ground resources engaged in

wildlife 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 publica-

tions, 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− 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 provid-

ing 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

Information Service (D−ATIS) both on a specified

radio frequency and also, for subscribers, in a text

message via data link to the cockpit or to a gate

printer. TDLS also provides Pre−departure Clear-

ances (PDC), at selected airports, to subscribers,

through a service provider, in text to the cockpit or to

a gate printer. In addition, TDLS will emulate the

Flight Data Input/Output (FDIO) information within

the control tower.
TERMINAL RADAR SERVICE AREA− Airspace

surrounding designated airports wherein ATC

provides radar vectoring, sequencing, and separation

on a full-time basis for all IFR and participating VFR

aircraft. The AIM contains an explanation of TRSA.