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Pilot/Controller Glossary

3/29/18

PCG T−4

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 telecommu-

nications services for landing facilities or

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.