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information that is broadcast on L/MF and VOR
facilities for pilots. (Provided only in Alaska.)
(Refer to AIM.)
TRANSFER OF CONTROL- That action whereby
the responsibility for the separation of an aircraft is
transferred from one controller to another.
(See ICAO term TRANSFER OF CONTROL.)
TRANSFER OF CONTROL [ICAO]- Transfer of
responsibility for providing air traffic control service.
TRANSFERRING CONTROLLER- A controller/
facility transferring control of an aircraft to another
controller/facility.
(See ICAO term TRANSFERRING
UNIT/CONTROLLER.)
TRANSFERRING FACILITY-
(See TRANSFERRING CONTROLLER.)
TRANSFERRING UNIT/CONTROLLER [ICAO]-
Air traffic control unit/air traffic controller in the
process of transferring the responsibility for
providing air traffic control service to an aircraft to
the next air traffic control unit/air traffic controller
along the route of flight.
Note:See definition of accepting unit/controller.
TRANSITIONa.
The general term that describes the change from
one phase of flight or flight condition to another; e.g.,
transition from en route flight to the approach or
transition from instrument flight to visual flight.
b. A published procedure (DP Transition) used to
connect the basic DP to one of several en route
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 transmission
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 automatically
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.)
2/14/08 Pilot/Controller Glossary
PCG T-7
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.
TURN ANTICIPATION- (maneuver anticipation).
TVOR-
(See TERMINAL‐VERY HIGH FREQUENCY
OMNIDIRECTIONAL RANGE STATION.)
TWEB-
(See TRANSCRIBED WEATHER BROADCAST.)
TWO‐WAY RADIO COMMUNICATIONS FAILURE-
(See LOST COMMUNICATIONS.)

2/14/08 Pilot/Controller Glossary
PCG U-1
U
UDF-
(See DIRECTION FINDER.)
UHF-
(See ULTRAHIGH FREQUENCY.)
ULTRAHIGH FREQUENCY- The frequency band
between 300 and 3,000 MHz. The bank of radio
frequencies used for military air/ground voice
communications. In some instances this may go as
low as 225 MHz and still be referred to as UHF.
ULTRALIGHT VEHICLE- An aeronautical vehicle
operated for sport or recreational purposes which
does not require FAA registration, an airworthiness
certificate, nor pilot certification. They are primarily
single occupant vehicles, although some two‐place
　
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