non-directional beacon An LF/MF or UHF radio beacon transmitting non-directional signals whereby the pilot of an aircraft equipped with direction-finding equipment can determine his or 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 (ILS) marker, it is normally called a marker beacon.
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abbreviation: NDB
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see also: radio beacon
Fr: radiophare non directionnel
non-instrument runway A runway intended for the operation of aircraft using visual approach procedures, or an instrument approach down to a height above aerodrome (HAA) or a height above touchdown zone elevation (HAT) not lower than 500 ft. Fr: piste à vue
non-precision approach procedure An instrument approach procedure (IAP) in which only electronic azimuth information is provided. No electronic glide path (GP) information is provided and obstacle assessment in the final segment is based on minimum descent altitude (MDA). Fr: procédure d’approche de non-précision
non-precision runway A runway served by visual aids and non-visual NAVAIDs that provide at least lateral guidance adequate for approach down to a height above aerodrome(HAA)/height above touchdown (HAT) of 500 ft but not lower than 250 ft.
. see also: precision runway
Fr: piste de non-précision
non-radar route A route on which an aircraft is able to determine its position, track and, consequently, the minimum IFR altitude without the benefit of radar information. Fr: route non radar
non-radar separation
The separation used when aircraft position information is derived from sources other than radar.
Fr: espacement non radar
non-standard formation A formation flight for which, through prior arrangement with ATC, the flight leader has received approval for formation dimensions other than standard ones. Fr: formation non standard
no radio An expression describing an inability to communicate by radio owing to the absence or failure of radio equipment.
. abbreviation: NORDO
Fr: sans radio
NORDO Abbreviation for: no radio Fr: NORDO
normal operating zone An airspace of defined dimensions, extending to either side of an instrument landing system (ILS) localizer centreline. Only the inner half of the normal operating zone is taken into account in independent approaches.
. abbreviation: NOZ
Fr: zone d’évolution normale
North American Datum 1983 The geodetic co-ordinate reference system used in Canada and the U.S. that allows the user to mathematically describe (in degrees of latitude and longitude) any position on the earth’s surface. NAD83 uses North American ground stations as references. Note: In Canada, NAD83 has been deemed to be equivalent to World Geodetic System 1984 for aviation purposes.
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abbreviation: NAD83
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