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Pilot/Controller Glossary

3/29/18

PCG T−5

b. Concerning a precision radar approach (PAR),

it is the point where the glide path intercepts the

landing surface.

(See ICAO term TOUCHDOWN.)

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.)

TRACEABLE PRESSURE STANDARD− The

facility station pressure instrument, with certifica-

tion/calibration traceable to the National Institute of

Standards and Technology. Traceable pressure

standards may be mercurial barometers, commis-

sioned ASOS/AWSS 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).
TRACK OF INTEREST (TOI)− Displayed data

representing an airborne object that threatens or has

the potential to threaten North America or National

Security. Indicators may include, but are not limited

to: noncompliance with air traffic control instructions

or aviation regulations; extended loss of communica-

tions; unusual transmissions or unusual flight

behavior; unauthorized intrusion into controlled

airspace or an ADIZ; noncompliance with issued

flight restrictions/security procedures; or unlawful

interference with airborne flight crews, up to and

including hijack. In certain circumstances, an object

may become a TOI based on specific and credible

intelligence pertaining to that particular aircraft/

object, its passengers, or its cargo.
TRACK OF INTEREST RESOLUTION− A TOI

will normally be considered resolved when: the

aircraft/object is no longer airborne; the aircraft

complies with air traffic control instructions, aviation

regulations, and/or issued flight restrictions/security

procedures; radio contact is re−established and

authorized control of the aircraft is verified; the

aircraft is intercepted and intent is verified to be