QNH altitude | QNH | Pression alt. | |
FT | 0 FT* | ||
*0 + (1013 - 1013) x 27
Pressure altitude is the height above a theoretical level where the weight of the atmosphere is 1013.2 hPa as measured by a barometer in the International Standard Atmosphere (ISA).
Pression alt. | STD temperature | Actual temperature | Density alt. |
FT | 15 °C | °C | 0 FT** |
**0 + 120 x (15 - (15))
Density altitude is pressure altitude adjusted for a non-standard temperature.
Decision alt. | RWY alt. | Actual temperature | Indicated alt. |
FT | FT | °C | 200 FT |
Decision altitude is a specified altitude at which a missed approach must be initiated if the required visual reference to continue the approach has not been established.