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Aeronautical Information Manual (AIM), page 677

5/26/16
12/10/15

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.
Pilot/Controller Glossary

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 Chart Supplement U.S.

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 specifica-
tion based on area navigation that does not include the
requirement for performance monitoring and alert-
ing, 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.


PCG N-1

Page 677 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   676 -- Page 677 -- 678