(See CONTROLLED AIRSPACE.)
(See TERMINAL RADAR SERVICE AREA.)
(Refer to AIM.)
(Refer to AIRPORT/FACILITY DIRECTORY.)
TERMINAL‐VERY HIGH FREQUENCY OMNI-DIRECTIONAL RANGE STATION- A very high frequency terminal omnirange station located on or near an airport and used as an approach aid.
(See NAVIGATIONAL AID.)
(See VOR.)
TERRAIN AWARENESS WARNING SYSTEM (TAWS)- An on-board, terrain proximity alerting system providing the aircrew `Low Altitude warnings' to allow immediate pilot action.
TERRAIN FOLLOWING- The flight of a military aircraft maintaining a constant AGL altitude above the terrain or the highest obstruction. The altitude of the aircraft will constantly change with the varying terrain and/or obstruction.
TETRAHEDRON- A device normally located on uncontrolled airports and used as a landing direction indicator. The small end of a tetrahedron points in the direction of landing. At controlled airports, the tetrahedron, if installed, should be disregarded because tower instructions supersede the indicator.
(See SEGMENTED CIRCLE.)
(Refer to AIM.)
TF-
(See TERRAIN FOLLOWING.)
THAT IS CORRECT- The understanding you have is right.
360 OVERHEAD-
(See OVERHEAD MANEUVER.)
THRESHOLD- The beginning of that portion of the runway usable for landing.
(See AIRPORT LIGHTING.)
(See DISPLACED THRESHOLD.)
THRESHOLD CROSSING HEIGHT- The theoreti-cal height above the runway threshold at which the aircraft's glideslope antenna would be if the aircraft maintains the trajectory established by the mean ILS glideslope or MLS glidepath.
(See GLIDESLOPE.)
(See THRESHOLD.)
THRESHOLD LIGHTS-
(See AIRPORT LIGHTING.)
TIBS-
(See TELEPHONE INFORMATION BRIEFING SERVICE.)
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
Pilot/Controller Glossary
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.
TMA-(See TRAFFIC MANAGEMENT ADVISOR.)
TMPA-
(See TRAFFIC MANAGEMENT PROGRAM
ALERT.)

TMU-
(See TRAFFIC MANAGEMENT UNIT.)
TODA [ICAO]-
(See ICAO Term TAKE‐OFF DISTANCE
AVAILABLE.)

TORA [ICAO]-
(See ICAO Term TAKE‐OFF 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.
TOTAL ESTIMATED ELAPSED TIME [ICAO]-For IFR flights, the estimated time required from take‐off 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 take‐off to arrive over the destination aerodrome.