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NO TRANSGRESSION ZONE (NTZ)− The NTZ is
a 2,000 foot wide zone, located equidistant between
parallel runway final approach courses in which
flight is not allowed.
NONAPPROACH CONTROL TOWER− Authorizes
aircraft to land or takeoff at the airport controlled
by the tower or to transit the Class D airspace. The
primary function of a nonapproach control tower is
the sequencing of aircraft in the traffic pattern and on
the landing area. Nonapproach control towers also
separate aircraft operating under instrument flight
rules clearances from approach controls and centers.
They provide ground control services to aircraft,
vehicles, personnel, and equipment on the airport
movement area.
NONCOMMON ROUTE/PORTION− That segment
of a North American Route between the inland
navigation facility and a designated North American
terminal.
NONCOMPOSITE SEPARATION− Separation in
accordance with minima other than the composite
separation minimum specified for the area concerned.
NONDIRECTIONAL BEACON− An L/MF or UHF
radio beacon transmitting nondirectional signals
whereby the pilot of an aircraft equipped with
direction finding equipment can determine his/her
bearing to or from the radio beacon and “home” on or
track to or from the station. When the radio beacon is
installed in conjunction with the Instrument Landing
System marker, it is normally called a Compass
Locator.
(See AUTOMATIC DIRECTION FINDER.)
(See COMPASS LOCATOR.)
NONMOVEMENT AREAS− Taxiways and apron
(ramp) areas not under the control of air traffic.
NONPRECISION APPROACH−
(See NONPRECISION APPROACH
PROCEDURE.)
NONPRECISION APPROACH PROCEDURE− A
standard instrument approach procedure in which no
electronic glideslope is provided; e.g., VOR, TACAN,
NDB, LOC, ASR, LDA, or SDF approaches.
NONRADAR− Precedes other terms and generally
means without the use of radar, such as:
a. Nonradar Approach. Used to describe instrument
approaches for which course guidance on final
approach is not provided by ground-based precision
or surveillance radar. Radar vectors to the final
2/17/05 Pilot/Controller Glossary
PCG N−3
approach course may or may not be provided by ATC.
Examples of nonradar approaches are VOR, NDB,
TACAN, and ILS/MLS approaches.
(See FINAL APPROACH COURSE.)
(See FINAL APPROACH-IFR.)
(See INSTRUMENT APPROACH
PROCEDURE.)
(See RADAR APPROACH.)
b. Nonradar Approach Control. An ATC facility
providing approach control service without the use of
radar.
(See APPROACH CONTROL FACILITY.)
(See APPROACH CONTROL SERVICE.)
c. Nonradar Arrival. An aircraft arriving at an
airport without radar service or at an airport served by
a radar facility and radar contact has not been
established or has been terminated due to a lack of
radar service to the airport.
(See RADAR ARRIVAL.)
(See RADAR SERVICE.)
d. Nonradar Route. A flight path or route over
which the pilot is performing his/her own navigation.
The pilot may be receiving radar separation, radar
monitoring, or other ATC services while on a
nonradar route.
(See RADAR ROUTE.)
e. Nonradar Separation. The spacing of aircraft in
accordance with established minima without the use
of radar; e.g., vertical, lateral, or longitudinal separation.
(See RADAR SEPARATION.)
(See ICAO term NONRADAR SEPARATION.)
NONRADAR SEPARATION [ICAO]− The separation
used when aircraft position information is
derived from sources other than radar.
NON−RESTRICTIVE ROUTING (NRR)− Portions
of a proposed route of flight where a user can flight
plan the most advantageous flight path with no
requirement to make reference to ground−based
NAVAIDs.
NOPAC−
(See NORTH PACIFIC.)
NORDO−
(See LOST COMMUNICATIONS.)
NORMAL OPERATING ZONE (NOZ)− The NOZ
is the operating zone within which aircraft flight
remains during normal independent simultaneous
parallel ILS approaches.
NORTH AMERICAN ROUTE− A numerically
coded route preplanned over existing airway and
route systems to and from specific coastal fixes
serving the North Atlantic. North American Routes
consist of the following:
a. Common Route/Portion. That segment of a
North American Route between the inland navigation
facility and the coastal fix.
b. Noncommon Route/Portion. That segment of a
North American Route between the inland navigation
facility and a designated North American terminal.
　
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