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(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 theoretical
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
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.
(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.)
TOUCHDOWNa.
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.)
Pilot/Controller Glossary 2/14/08
PCG T-4
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.
TOUCHDOWN RVR-
(See VISIBILITY.)
TOUCHDOWN ZONE- The first 3,000 feet of the
runway beginning at the threshold. The area is used
for determination of Touchdown Zone Elevation in
the development of straight‐in landing minimums for
instrument approaches.
(See ICAO term TOUCHDOWN ZONE.)
TOUCHDOWN ZONE [ICAO]- The portion of a
runway, beyond the threshold, where it is intended
landing aircraft first contact the runway.
TOUCHDOWN ZONE ELEVATION- The highest
elevation in the first 3,000 feet of the landing surface.
TDZE is indicated on the instrument approach
procedure chart when straight‐in landing minimums
are authorized.
(See TOUCHDOWN ZONE.)
TOUCHDOWN ZONE LIGHTING-
(See AIRPORT LIGHTING.)
TOWER- A terminal facility that uses air/ground
communications, visual signaling, and other devices
to provide ATC services to aircraft operating in the
vicinity of an airport or on the movement area.
Authorizes aircraft to land or takeoff at the airport
controlled by the tower or to transit the Class D
airspace area regardless of flight plan or weather
conditions (IFR or VFR). A tower may also provide
approach control services (radar or nonradar).
(See AIRPORT TRAFFIC CONTROL SERVICE.)
(See APPROACH CONTROL FACILITY.)
(See APPROACH CONTROL SERVICE.)
(See MOVEMENT AREA.)
(See TOWER EN ROUTE CONTROL
SERVICE.)
(See ICAO term AERODROME CONTROL
TOWER.)
(Refer to AIM.)
TOWER EN ROUTE CONTROL SERVICE- The
control of IFR en route traffic within delegated
airspace between two or more adjacent approach
control facilities. This service is designed to expedite
traffic and reduce control and pilot communication
requirements.
TOWER TO TOWER-
(See TOWER EN ROUTE CONTROL
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