Landing area. That part of a movement area intended for the landing or take-off of aircraft.
Level. A generic term relating to the vertical position of an aircraft in flight and meaning variously, height, altitude or flight level.
Location indicator. A four-letter code group formulated in accordance with rules prescribed by ICAO and assigned to the location of an aeronautical fixed station.
Manoeuvring area. That part of an aerodrome to be used for the take-off, landing and taxiing of aircraft, excluding aprons.
Meteorological information. Meteorological report, analysis, forecast, and any other statement relating to existing or expected meteorological conditions.
Meteorological office. An office designated to provide meteorological service for international air navigation.
Meteorological report. A statement of observed meteorological conditions related to a specified time and location.
Minimum fuel. The term used to describe a situation in which an aircraft’s fuel supply has reached a state where little or no delay can be accepted.
Note.— This is not an emergency situation but merely indicates that an emergency situation is possible, should any undue delay occur.
Missed approach procedure. The procedure to be followed if the approach cannot be continued.
Mode (SSR). The conventional identifier related to specific functions of the interrogation signals transmitted by an SSR interrogator. There are four modes specified in Annex 10: A, C, S and intermode.
Movement area. That part of an aerodrome to be used for the take-off, landing and taxiing of aircraft, consisting of the manoeuvring area and the apron(s).
Near-parallel runways. Non-intersecting runways whose extended centre lines have an angle of convergence/ divergence of 15 degrees or less.
Non-radar separation. The separation used when aircraft position information is derived from sources other than radar.
Normal operating zone (NOZ). Airspace of defined dimen-sions extending to either side of an ILS localizer course and/or MLS final approach track. Only the inner half of the normal operating zone is taken into account in independent parallel approaches.
NOTAM. A notice distributed by means of telecommunication containing information concerning the establishment, condition or change in any aeronautical facility, service, procedure or hazard, the timely knowledge of which is essential to personnel concerned with flight operations.
No transgression zone (NTZ). In the context of independent parallel approaches, a corridor of airspace of defined dimensions located centrally between the two extended runway centre lines, where a penetration by an aircraft requires a controller intervention to manoeuvre any threatened aircraft on the adjacent approach.
Obstacle clearance altitude (OCA) or obstacle clearance height (OCH). The lowest altitude or the lowest height above the elevation of the relevant runway threshold or the aerodrome elevation as applicable, used in establishing compliance with appropriate obstacle clearance criteria.
Note 1.— Obstacle clearance altitude is referenced to mean sea level and obstacle clearance height is referenced to the threshold elevation or in the case of non-precision
No. 2
I. Definitions
approaches to the aerodrome elevation or the threshold elevation if that is more than 2 m (7 ft) below the aerodrome elevation. An obstacle clearance height for a circling approach is referenced to the aerodrome elevation.
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