N
NAS-
(See NATIONAL AIRSPACE
SYSTEM.)
NATIONAL 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 military.
NATIONAL 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 (FIR).
(See FLIGHT INFORMATION
REGION.)
NATIONAL 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 Digest.
(See NATIONAL FLIGHT DATA
DIGEST.)
NATIONAL 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.
NATIONAL 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.
NAVAID-
(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.
Note: The 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
Airport/Facility Directory.
NAVIGABLE AIRSPACE-
Airspace at and above the minimum flight altitudes prescribed in the CFRs
including airspace needed for safe takeoff and landing.
(Refer to 14 CFR Part 91.)
NAVIGATION REFERENCE
SYSTEM (NRS)- The NRS is a system of waypoints developed for use within the
United States for flight planning and navigation without reference to ground
based navigational aids. The NRS waypoints are located in a grid pattern along
defined latitude and longitude lines. The initial use of the NRS will be in the
high altitude environment in conjunction with the High Altitude Redesign
initiative. The NRS waypoints are intended for use by aircraft capable of
point-to-point navigation.
NAVIGATION SPECIFICATION [ICAO]- A set of
aircraft and flight crew requirements needed to
support performance-based navigation operations
within a defined airspace. There are two kinds of
navigation specifications:
a. RNP specification. A navigation specification
based on area navigation that includes the
requirement for performance monitoring and alerting, designated by the prefix RNP; e.g., RNP 4, RNP
APCH.
b. RNAV specification. A navigation specification based on area navigation that does not include the
requirement for performance monitoring and alerting, designated by the prefix RNAV; e.g., RNAV 5,
RNAV 1.
Note: The Performance-based Navigation Manual
(Doc 9613), Volume II contains detailed guidance
on navigation specifications.
NAVIGATIONAL AID- 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.)
NBCAP AIRSPACE-
(See NATIONAL BEACON CODE
ALLOCATION PLAN AIRSPACE.)
NDB-
(See NONDIRECTIONAL BEACON.)
NEGATIVE-
"No," or "permission not granted," or "that is not correct."
NEGATIVE CONTACT-
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 particular frequency.
NFDC-
(See NATIONAL FLIGHT DATA
CENTER.)
NFDD-
(See NATIONAL FLIGHT DATA
DIGEST.)
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.
Note: 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 appropriate.
(Refer to AIM.)
NO GYRO VECTOR-
(See NO GYRO APPROACH.)
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-
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.
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 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.
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 AMERICAN 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.
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.
NOTAM-
(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 flight operations.
a. I Distribution-
Distribution by means of telecommunication.
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.)
NOTICES
TO 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.)
NRR-
(See NON-RESTRICTIVE
ROUTING.)
NRS-
(See NAVIGATION REFERENCE
SYSTEM.)
NTAP-
(See NOTICES TO AIRMEN
PUBLICATION.)
NUMEROUS TARGETS
VICINITY (LOCATION)- A traffic advisory issued by ATC to advise pilots
that targets on the radar scope are too numerous to issue individually.
(See TRAFFIC ADVISORIES.)
|