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Aeronautical Information Manual (AIM), page 678

Pilot/Controller Glossary 5/26/16


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 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.)
12/10/15

NO TRANSGRESSION ZONE (NTZ)- The NTZ is
a 2,000 foot wide zone, located equidistant between
parallel runway or SOIA final approach courses in
which flight is normally 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 con-
cerned.
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

PCG N-2

Page 678 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   677 -- Page 678 -- 679