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Pressure Altitude/ Density Altitude

Your in and out of ground effect hover ceiling is found in your POH by applying the pressure/ density altitude for the day, combined with the gross aircraft weight. You will likely have to do a performance calculation such as this on your helicopter check ride.

Notice that as temperature and weight increase, the hover ceiling is lowered.

Notice that the in ground effect ceiling is always higher that the out of ground effect ceiling.

Standard barometric pressure is 29.92. Standard temperature is 15 deg Celsius.

Low pressure is bad for performance and the resulting difference will be added to the given airport elevation. High pressure is good for performance and the resulting difference will be subtracted from the given airport elevation.

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