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Pilot/Controller Glossary 

6/17/21 

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.) 

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 
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 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 
(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 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 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 

PCG T