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A
A corridor of airspace, maximum 610 m wide, located centrally between the two extended runway centre lines. It extends from the nearer runway threshold to the point where 1000 ft vertical separation is reduced.
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B
A corridor of airspace at least 500 m wide located centrally between the two extended runway centre lines. It extends from the farthest runway threshold to the point where 1000 ft vertical separation is reduced.
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C
A corridor of airspace at least 610 m wide located centrally between the two extended runway centre lines. It extends from the nearer runway threshold to the point where 1000 ft vertical separation is reduced.
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D
A corridor of airspace at least 500 m wide located centrally between the two extended runway centre lines. It extends from the farthest runway threshold to the point where 1500 ft vertical separation is reduced.
ICAO Doc 8168
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.
Chapter 1. MODES OF OPERATION
1.2.2.2 No transgression zone (NTZ)
In the context of independent parallel approaches, this is a corridor of airspace at least 610 m (2000 ft) wide located centrally between the two extended runway centre lines. It extends from the nearer runway threshold to the point where 300 m (1000 ft) vertical separation is reduced. Penetration of the NTZ by an aircraft requires controller intervention to manoeuvre any threatened aircraft on the adjacent approach.
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