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时间:2011-08-13 12:47来源:蓝天飞行翻译 作者:航空
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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/VECTOR - A radar approach/vector provided in case of a malfunctioning gyrocompass 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.
NON-APPROACH CONTROL TOWER - Authorizes aircraft to land or take-off at the airport controlled by the tower, or to transit the airport traffic area. The primary function of a non-approach control tower is the sequencing of aircraft in the traffic pattern and on the landing area. Non-approach 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.
NON-COMPOSITE SEPARATION - Separation in accordance with minima other than the composite separation minimum specified for the area concerned.
NON-DIRECTIONAL BEACON/RADIO BEACON/NDB - A Low/Medium Frequency or Ultra High Frequency radio beacon transmitting non-directional signals whereby the pilot of an aircraft equipped with Direction Finding equipment can determine his 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 Compass Locator, Automatic Direction Finder)
NON-FREE FLYING AREA (DIA) - An area normally delineated by an international boundary or the territorial water adjacent thereto wherein penetration by United States military aircraft is likely to result in their being fired upon without warning.
NON-PRECISION APPROACH PROCEDURE/NONPRECISION APPROACH - A standard instrument approach procedure in which no electronic glide slope is provided; e.g., VOR, TACAN, NDB, LOC, ASR, LDA, or SDF approach.
NON-RADAR - Precedes other terms and generally means without the use of radar, such as:
(1)
NON-RADAR ROUTE - A flight path or route over which the pilot is performing his own navigation. The pilot may be receiving radar separation, radar monitoring or other Air Traffic Control services while on a non-radar route. (See Radar Route)

(2)
NON-RADAR 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 Air Traffic Control. Examples of non-radar approach are VOR, NDB, TACAN, and Instrument Landing System/Microwave Landing System approach. (See Final Approach - IFR, Final Approach Course, Radar Approach, Instrument Approach Procedure)

(3)
NON-RADAR 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)

(4)
NON-RADAR 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, Radar Service)

(5)
NON-RADAR APPROACH CONTROL - An Air Traffic Control facility providing approach control service without the use of radar. (See Approach Control, Approach Control Service)


NON-RADAR SEPARATION (ICAO) - The separation used when aircraft position information is derived from sources other than radar.
NORDO - Non-radio equipped aircraft. Not to be used to designate aircraft which have radio failure.
NORMAL OPERATING ZONE (NOZ) - The NOZ is the operating zone within which aircraft flight remains during normal independent simultaneous parallel ILS approaches.
 
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