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Pilot/Controller Glossary

3/29/18

PCG T−8

airways/jet routes, or a published procedure (STAR

Transition) used to connect one of several en route

airways/jet routes to the basic STAR.

(Refer to DP/STAR Charts.)

TRANSITION POINT− A point at an adapted

number of miles from the vertex at which an arrival

aircraft would normally commence descent from its

en route altitude. This is the first fix adapted on the

arrival speed segments.

TRANSITION WAYPOINT− The waypoint that

defines the beginning of a runway or en route

transition on an RNAV SID or STAR.

TRANSITIONAL AIRSPACE− That portion of

controlled airspace wherein aircraft change from one

phase of flight or flight condition to another.

TRANSMISSOMETER− An apparatus used to

determine visibility by measuring the transmission of

light through the atmosphere. It is the measurement

source for determining runway visual range (RVR)

and runway visibility value (RVV).

(See VISIBILITY.)

TRANSMITTING IN THE BLIND−  A transmis-

sion from one station to other stations in

circumstances where two-way communication

cannot be established, but where it is believed that the

called stations may be able to receive the

transmission.

TRANSPONDER− The airborne radar beacon

receiver/transmitter portion of the Air Traffic Control

Radar Beacon System (ATCRBS) which automati-

cally receives radio signals from interrogators on the

ground, and selectively replies with a specific reply

pulse or pulse group only to those interrogations

being received on the mode to which it is set to

respond.

(See INTERROGATOR.)
(See ICAO term TRANSPONDER.)
(Refer to AIM.)

TRANSPONDER [ICAO]− A receiver/transmitter

which will generate a reply signal upon proper

interrogation; the interrogation and reply being on

different frequencies.

TRANSPONDER CODES

(See CODES.)

TRANSPONDER OBSERVED − Phraseology used

to inform a VFR pilot the aircraft

’s assigned beacon

code and position have been observed. Specifically,

this term conveys to a VFR pilot the transponder

reply has been observed and its position correlated for

transit through the designated area.
TRIAL PLAN− A proposed amendment which

utilizes automation to analyze and display potential

conflicts along the predicted trajectory of the selected

aircraft.
TRSA

(See TERMINAL RADAR SERVICE AREA.)

TSD−

(See TRAFFIC SITUATION DISPLAY.)

TURBOJET AIRCRAFT− An aircraft having a jet

engine in which the energy of the jet operates a

turbine which in turn operates the air compressor.
TURBOPROP AIRCRAFT− An aircraft having a jet

engine in which the energy of the jet operates a

turbine which drives the propeller.
TURBULENCE− An atmospheric phenomenon that

causes changes in aircraft altitude, attitude, and or

airspeed with aircraft reaction depending on

intensity. Pilots report turbulence intensity according

to aircraft’s reaction as follows:

a. Light − Causes slight, erratic changes in altitude

and or attitude (pitch, roll, or yaw).

b. Moderate− Similar to Light but of greater

intensity. Changes in altitude and or attitude occur

but the aircraft remains in positive control at all times.

It usually causes variations in indicated airspeed.

c. Severe− Causes large, abrupt changes in altitude

and or attitude. It usually causes large variations in

indicated airspeed. Aircraft may be momentarily out

of control.

d. Extreme− The aircraft is violently tossed about

and is practically impossible to control. It may cause

structural damage.

(See CHOP.)
(Refer to AIM.)

TURN ANTICIPATION− (maneuver anticipation).
TVOR

(See TERMINAL-VERY HIGH FREQUENCY

OMNIDIRECTIONAL RANGE STATION.)

TWEB

(See TRANSCRIBED WEATHER BROADCAST.)