Meteorologyaltimetry
Area QNH
Area QNH is an altimeter setting forecast by the Bureau of Meteorology that is within ±5 hPa of the actual QNH for any location within a specified geographical area. It is used to maintain vertical separation when flying below the transition altitude and a local QNH is not available. Area QNH is a forecast value and may differ slightly from the actual QNH at a given location.
Key Points
- •Forecast by the Bureau of Meteorology for a specified geographical area.
- •Accurate to within ±5 hPa of the actual QNH for any location within that area.
- •Used when operating below the transition altitude and a local QNH is unavailable.
Exam Relevance
Understanding Area QNH is essential for accurate altimetry and maintaining vertical separation outside of terminal areas.
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