background image

12/2/21 

Pilot/Controller Glossary 

through the assignment of time at specific points for 
an aircraft. TBM applies time to manage and 
condition air traffic flows to mitigate 
demand/capacity imbalances and enhance efficiency 
and predictability of the NAS. Where implemented, 
TBM tools will be used to manage traffic even during 
periods when demand does not exceed capacity. This 
will sustain operational predictability and assure the 
regional/national strategic plan is maintained. TBM 
uses capabilities within TFMS, TBFM, and TFDM. 
These programs are designed to achieve a specified 
interval between aircraft. Different types of programs 
accommodate different phases of flight. 

TIME GROUP

 Four digits representing the hour 

and minutes from the Coordinated Universal Time 
(UTC) clock. FAA uses UTC for all operations. The 
term “ZULU” may be used to denote UTC. The word 
“local” or the time zone equivalent shall be used to 
denote local when local time is given during radio and 
telephone communications. When written, a time 
zone designator is used to indicate local time; e.g., 
“0205M” (Mountain). The local time may be based 
on the 24-hour clock system. The day begins at 0000 
and ends at 2359. 

TIMELINE GRAPHICAL USER INTERFACE 
(TGUI)

 A TBFM display that uses timelines to 

display the Estimated Time of Arrival and Scheduled 
Time of Arrival of each aircraft to specified constraint 
points. The TGUI can also display pre

departure and 

scheduled aircraft. 

TIS

B

 

(See TRAFFIC INFORMATION 

SERVICE

BROADCAST.) 

TMI

 

(See TRAFFIC MANAGEMENT INITIATIVE.) 

TMPA

 

(See TRAFFIC MANAGEMENT PROGRAM 

ALERT.) 

TMU

 

(See TRAFFIC MANAGEMENT UNIT.) 

TOD

 

(See TOP OF DESCENT.) 

TODA

 

(See TAKEOFF DISTANCE AVAILABLE.) 
(See ICAO term TAKEOFF DISTANCE 

AVAILABLE.) 

TOI

 

(See TRACK OF INTEREST.) 

TOP ALTITUDE

 In reference to SID published 

altitude restrictions, the charted 

maintain” altitude 

contained in the procedure description or assigned by 
ATC. 

TOP OF DESCENT (TOD)

 The point at which an 

aircraft begins the initial descent. 

TORA

 

(See TAKEOFF RUN AVAILABLE.) 
(See ICAO term TAKEOFF RUN AVAILABLE.) 

TORCHING

 The burning of fuel at the end of an 

exhaust pipe or stack of a reciprocating aircraft 
engine, the result of an excessive richness in the fuel 
air mixture. 

TOS

 

(See TRAJECTORY OPTIONS SET) 

TOTAL ESTIMATED ELAPSED TIME [ICAO]

 

For IFR flights, the estimated time required from 
takeoff to arrive over that designated point, defined 
by reference to navigation aids, from which it is 
intended that an instrument approach procedure will 
be commenced, or, if no navigation aid is associated 
with the destination aerodrome, to arrive over the 
destination aerodrome. For VFR flights, the 
estimated time required from takeoff to arrive over 
the destination aerodrome. 

(See ICAO term ESTIMATED ELAPSED TIME.) 

TOUCH-AND-GO

 An operation by an aircraft that 

lands and departs on a runway without stopping or 
exiting the runway. 

TOUCH-AND-GO LANDING

 

(See TOUCH-AND-GO.) 

TOUCHDOWN

 

a. 

The point at which an aircraft first makes 

contact with the landing surface. 

b. 

Concerning a precision radar approach (PAR), 

it is the point where the glide path intercepts the 
landing surface. 

(See ICAO term TOUCHDOWN.) 

TOUCHDOWN [ICAO]

 The point where the 

nominal glide path intercepts the runway. 

Note: Touchdown as defined above is only a datum 

and is not necessarily the actual point at which the 
aircraft will touch the runway. 

PCG T