Restrictions Relating to Approach Paths
- The approval in writing of the New Zealand Defence Force is required prior to the erection of any building, change in use of any land or building, or any subdivision of land, and prior to any building or resource consent application for such works/activities, within the areas of the designation shown on the planning maps as ‘land use and subdivision subject to NZDF approval’. These areas are generally within 1,000 metres of the runways.
- No obstacle shall penetrate the approach and departure path obstacle limitation surfaces shown on the planning maps and explained by the text “Explanation of Protection Surfaces Whenuapai Airfield” and diagram MD1A below without the prior approval in writing of the New Zealand Defence Force. This restriction shall not apply to any building being erected which has a height of not more than 9.0 metres above natural ground level.
Explanation of Protection Surfaces
These protection surfaces have been developed in accordance with NZ Civil Aviation Circulars (AC) 139-6 and AC 139-10. Where two or more surfaces (whether takeoff, approach, transitional, horizontal or conical surfaces) coincide, the lower shall apply.
1. Takeoff, Approach and Transitional Surfaces
The Takeoff and Approach surfaces coincide and commence at 60 metres from the end of the runway threshold. The width of the start of the surface is 300 metres for Runways 03 and 21 and 180 metres for Runways 08 and 26. Each surface diverges in width each side at a rate of 1:6.6 (15%) and extends at a gradient of 1 in 50 (2%) for a total distance of 15 kilometres. As a result, maximum permitted building altitude increases with distance from the Airfield.
The Transitional Side Surfaces, which restrict building altitudes either side of the runway, are imposed either side of the aerodrome strip. The Transitional Side Surface slopes upward from the edge of the aerodrome strip at a gradient of 1:7 (14.3%) to the inner edge of the Inner Horizontal Surface at a height of 45 metres above the Aerodrome Elevation and at an elevation of 76.3 metres above mean sea level (AMSL). The effect of these surfaces on maximum building altitude is illustrated in Diagram MD1A.
2. Inner Horizontal and Conical Surfaces
The Inner Horizontal Surface is a horizontal “near circular” plane extending 4000 metres out from the edge of the aerodrome strip at a height of 45 metres above the Aerodrome Elevation and at an elevation of 76.3 metres above mean sea level (AMSL).
The Conical Surface is an upward sloping surface that extends outwards from the outer edge of the Inner Horizontal Surface at a gradient of 5% to an elevation of 150m above the Aerodrome Elevation and at an elevation of 181.3 metres above mean sea level (AMSL). The effect of these surfaces on maximum permitted altitude of buildings and other objects is illustrated in Diagram MD1A.
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