Pilot/Controller Glossary

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-