(See NATIONAL AIRSPACE SYSTEM.)
NAS STAGE A- The en route
ATC system's radar, computers and computer programs, controller plan
view displays (PVDs/Radar Scopes), input/output devices, and the
related communications equipment which are integrated to form the
heart of the automated IFR air traffic control system. This equipment
performs Flight Data Processing (FDP) and Radar Data Processing (RDP).
It interfaces with automated terminal systems and is used in the
control of en route IFR aircraft.
(Refer to AIM.)
AIRSPACE SYSTEM- The common network of U.S. airspace; air
navigation facilities, equipment and services, airports or landing
areas; aeronautical charts, information and services; rules,
regulations and procedures, technical information, and manpower and
material. Included are system components shared jointly with the
BEACON CODE ALLOCATION PLAN AIRSPACE- Airspace over United States
territory located within the North American continent between Canada
and Mexico, including adjacent territorial waters outward to about
boundaries of oceanic control areas (CTA)/Flight Information Regions
(See FLIGHT INFORMATION REGION.)
FLIGHT DATA CENTER- A facility in Washington D.C., established by
FAA to operate a central aeronautical information service for the
collection, validation, and dissemination of aeronautical data in
support of the activities of government, industry, and the aviation
community. The information is published in the National Flight Data
(See NATIONAL FLIGHT DATA
FLIGHT DATA DIGEST- A daily (except weekends and Federal holidays)
publication of flight information appropriate to aeronautical charts,
aeronautical publications, Notices to Airmen, or other media serving
the purpose of providing operational flight data essential to safe and
efficient aircraft operations.
ROUTE PROGRAM (NRP)- The NRP is a set of rules and procedures
which are designed to increase the flexibility of user flight planning
within published guidelines.
SEARCH AND RESCUE PLAN- An interagency agreement which provides
for the effective utilization of all available facilities in all types
of search and rescue missions.
(See NAVIGATIONAL AID.)
NAVAID CLASSES- VOR,
VORTAC, and TACAN aids are classed according to their operational use.
The three classes of NAVAIDs are:
a. T- Terminal.
b. L- Low altitude.
c. H- High altitude.
normal service range for T, L, and H class aids is found in the AIM.
Certain operational requirements make it necessary to use some of
these aids at greater service ranges than specified. Extended range is
made possible through flight inspection determinations. Some aids also
have lesser service range due to location, terrain, frequency
protection, etc. Restrictions to service range are listed in
Airspace at and above the minimum flight altitudes prescribed in the
CFRs including airspace needed for safe takeoff and landing.
14 CFR Part 91.)
Any visual or electronic device airborne or on the surface which
provides point-to-point guidance information or position data to
aircraft in flight.
(See AIR NAVIGATION FACILITY.)
BEACON CODE ALLOCATION PLAN AIRSPACE.)
(See NONDIRECTIONAL BEACON.)
"No," or "permission not granted," or "that is not correct."
Used by pilots to inform ATC that:
a. Previously issued traffic is not in
sight. It may be followed by the pilot's request for the controller
to provide assistance in avoiding the traffic.
b. They were unable to contact ATC on a
(See NATIONAL FLIGHT DATA
(See NATIONAL FLIGHT DATA
NIGHT- The time between the end
of evening civil twilight and the beginning of morning civil twilight,
as published in the American Air Almanac, converted to local time.
(See ICAO term NIGHT.)
NIGHT [ICAO]- The hours
between the end of evening civil twilight and the beginning of morning
civil twilight or such other period between sunset and sunrise as may
be specified by the appropriate authority.
Civil twilight ends in the evening when the center of the sun's disk
is 6 degrees below the horizon and begins in the morning when the
center of the sun's disk is 6 degrees below the horizon.
NO GYRO APPROACH-
A radar approach/vector provided in case of a malfunctioning
gyro-compass or directional gyro. Instead of providing the pilot with
headings to be flown, the controller observes the radar track and
issues control instructions "turn right/left" or "stop turn" as
(Refer to AIM.)
NO GYRO VECTOR-
(See NO GYRO APPROACH.)
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.
CONTROL TOWER- Author- izes 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.
ROUTE/PORTION- That segment of a North American Route between the
inland navigation facility and a designated North American terminal.
SEPARATION- Separation in accordance with minima other than the
composite separation minimum specified for the area concerned.
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.)
Taxiways and apron (ramp) areas not under the control of air traffic.
(See NONPRECISION APPROACH
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 approach course may or may not be provided by
ATC. Examples of nonradar approaches are VOR, NDB, TACAN, and
(See FINAL APPROACH COURSE.)
(See INSTRUMENT APPROACH PROCEDURE.)
b. Nonradar Approach Control. An ATC
facility providing approach control service without the use of
(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.
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.
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 ICAO term NONRADAR
SEPARATION [ICAO]- The separation used when aircraft position
information is derived from sources other than radar.
(See NORTH PACIFIC.)
(See LOST COMMUNICATIONS.)
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
b. Noncommon Route/Portion. That segment
of a North American Route between the inland navigation facility and
a designated North American terminal.
c. Inland Navigation Facility. A
navigation aid on a North American Route at which the common route
and/or the noncommon route begins or ends.
d. Coastal Fix. A navigation aid or
intersection where an aircraft transitions between the domestic
route structure and the oceanic route structure.
NORTH MARK- A beacon data
block sent by the host computer to be displayed by the ARTS on a 360
degree bearing at a locally selected radar azimuth and distance. The
North Mark is used to ensure correct range/azimuth orientation during
periods of CENRAP.
NORTH PACIFIC- An
organized route system between the Alaskan west coast and Japan.
(See NOTICE TO AIRMEN.)
NOTAM [ICAO]- A notice
containing information concerning the establishment, condition or
change in any aeronautical facility, service, procedure or hazard, the
timely knowledge of which is essential to personnel concerned with
a. I Distribution- Distribution by means
b. II Distribution- Distribution by means
other than telecommunications.
NOTICE TO AIRMEN- A
notice containing information (not known sufficiently in advance to
publicize by other means) concerning the establishment, condition, or
change in any component (facility, service, or procedure of, or hazard
in the National Airspace System) the timely knowledge of which is
essential to personnel concerned with flight operations.
a. NOTAM(D)- A NOTAM given (in addition to
local dissemination) distant dissemination beyond the area of
responsibility of the Flight Service Station. These NOTAMs will be
stored and available until canceled.
b. NOTAM(L)- A NOTAM given local
dissemination by voice and other means, such as telautograph and
telephone, to satisfy local user requirements.
c. FDC NOTAM- A NOTAM regulatory in
nature, transmitted by USNOF and given system wide dissemination.
(See ICAO term NOTAM.)
AIRMEN PUBLICATION- A publication issued every 28 days, designed
primarily for the pilot, which contains current NOTAM information
considered essential to the safety of flight as well as supplemental
data to other aeronautical publications. The contraction NTAP is used
in NOTAM text.
(See NOTICE TO AIRMEN.)
(See NOTICES TO AIRMEN
VICINITY (LOCATION)- A traffic advisory issued by ATC to
advise pilots that targets on the radar scope are too numerous to