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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.
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.
Pilot/Controller Glossary 2/14/08
PCG N-2
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
　
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