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Pilot/Controller Glossary 

6/17/21 

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. 

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.) 

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. 

NON

COOPERATIVE SURVEILLANCE

 Any 

surveillance system, such as primary radar, that is not 
dependent upon the presence of any equipment on the 
aircraft or vehicle to be tracked. 

(See COOPERATIVE SURVEILLANCE.) 
(See RADAR.) 

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 

PCG N