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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
SERVICE.)
TPX‐42- A numeric beacon decoder equipment/
system. It is designed to be added to terminal radar
systems for beacon decoding. It provides rapid target
identification, reinforcement of the primary radar
target, and altitude information from Mode C.
(See AUTOMATED RADAR TERMINAL
SYSTEMS.)
(See TRANSPONDER.)
TRACEABLE PRESSURE STANDARD- The
facility station pressure instrument, with certification/
calibration traceable to the National Institute of
Standards and Technology. Traceable pressure
standards may be mercurial barometers, commissioned
ASOS or dual transducer AWOS, or portable
pressure standards or DASI.
TRACK- The actual flight path of an aircraft over the
surface of the earth.
(See COURSE.)
(See FLIGHT PATH.)
(See ROUTE.)
(See ICAO term TRACK.)
TRACK [ICAO]- The projection on the earth's
surface of the path of an aircraft, the direction of
which path at any point is usually expressed in
degrees from North (True, Magnetic, or Grid).
TRAFFICa.
A term used by a controller to transfer radar
identification of an aircraft to another controller for
the purpose of coordinating separation action. Traffic
is normally issued:
1. In response to a handoff or point out,
2. In anticipation of a handoff or point out, or
3. In conjunction with a request for control of an
aircraft.
b. A term used by ATC to refer to one or more
aircraft.
TRAFFIC ADVISORIES- Advisories issued to alert
pilots to other known or observed air traffic which
may be in such proximity to the position or intended
route of flight of their aircraft to warrant their
attention. Such advisories may be based on:
a. Visual observation.
2/14/08 Pilot/Controller Glossary
PCG T-5
b. Observation of radar identified and nonidentified
aircraft targets on an ATC radar display, or
c. Verbal reports from pilots or other facilities.
Note 1:The word “traffic” followed by additional
information, if known, is used to provide such
advisories; e.g., “Traffic, 2 o'clock, one zero miles,
southbound, eight thousand.”
Note 2:Traffic advisory service will be provided to
the extent possible depending on higher priority
duties of the controller or other limitations; e.g.,
radar limitations, volume of traffic, frequency
congestion, or controller workload. Radar/
nonradar traffic advisories do not relieve the pilot
　
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