normal operating zone

normal operating zone (NOZ)

normal operating zone (NOZ)click for a larger image
An airspace of defined dimensions extending to either side of an ILS (instrument landing system) localizer course and/or MLS (microwave landing system) final approach track. Only the inner half of the normal operating zone is taken into account in independent parallel approaches.
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Boundary data includes process alarms, safety instrumented and environmental trip points, mechanical design limits, normal operating zones, and safe operating envelopes.
An EA spokesman said: "With the exception of north-west England, there is currently little threat to public water supplies across the rest of England and Wales, as groundwater levels are healthy and reservoirs are generally within their normal operating zones, despite some being below average for this time of year.