Pilot/Controller Glossary

which the aircraft"s glideslope antenna would be if
the aircraft maintains the trajectory established by the
mean ILS glideslope or the altitude at which the
calculated glidepath of an RNAV or GPS approaches.
(See GLIDESLOPE.)
(See THRESHOLD.)

THRESHOLD LIGHTS-
(See AIRPORT LIGHTING.)

TIBS-
(See TELEPHONE INFORMATION BRIEFING
SERVICE.)

TIE-IN FACILITY" The FSS primarily responsible
for providing FSS services, including telecommuni ca ti on s se rv i ce s fo r la nd in g f ac il it ie s o r
navigational aids located within the boundaries of a
flight plan area (FPA). Three-letter identifiers are
assigned to each FSS/FPA and are annotated as tie-in
facilities in the Chart Supplement U.S., the Alaska
Supplement, the Pacific Supplement, and FAA Order
JO 7350.9, Location Identifiers. Large consolidated
FSS facilities may have many tie-in facilities or FSS
sectors within one facility.
(See FLIGHT PLAN AREA.)
(See FLIGHT SERVICE STATION.)

TIME BASED FLOW MANAGEMENT (TBFM)-
The hardware, software, methods, processes, and
initiatives to manage air traffic flows based on time
to balance air traffic demand with system capacity,
and support the management of PBN. This includes,
but not limited to, Adjacent Center Metering (ACM),
En Route Departure Capability (EDC),
Ground-based Interval Management-Spacing
(GIM-S), Integrated Departure/Arrival Capability
(IDAC), Single Center Metering (SCM),
Time-Based Metering (TBM), Time-Based
Scheduling (TBS), and Extended/Coupled Metering.
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.

TIS-B-
(See TRAFFIC INFORMATION
SERVICE-BROADCAST.)

TMPA-
(See TRAFFIC MANAGEMENT PROGRAM
ALERT.)

TMU-
(See TRAFFIC MANAGEMENT UNIT.)

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.
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.