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Altitude: Difference between revisions
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*The [[altimeter]] reading. | *The [[altimeter]] reading. | ||
The altimeter can be set on '''three''' possible references | The altimeter can be set on '''three''' possible references | ||
#the "barometric pressure adjusted to sea level" ([[#QNH]]) resulting in indicated altitude above [[Mean Sea Level]] for a certain region during current weather conditions. While on the airfield the altimeter would read the altitude of the airfield, the [[#True altitude]]. If | #the "barometric pressure adjusted to sea level" ([[#QNH]]) resulting in indicated altitude above [[Mean Sea Level]] for a certain region during current weather conditions. While on the airfield the altimeter would read the altitude of the airfield, the [[#True altitude]]. If QNH is not available but the height of the departing airfield is known, the alitimeter can be set on the height of the airfield. It is also possible to use QNH from a nearby airfield. | ||
#height above the airfield. While on the runway the indicated altitude would read zero. Near the airfield the indicated altitude would be [[above ground level]], the [[#Absolute altitude]] | #height above the airfield. While on the runway the indicated altitude would read zero. Near the airfield the indicated altitude would be [[above ground level]], the [[#Absolute altitude]] | ||
#Standard pressure (29.92" Hg or 1013.25 millibars) resulting in the [[#Pressure altitude]]. While on the airfield the altimeter will not display the altitude. It will display the barometric pressure expressed in feet. It provides a standard altitude reading above a certain height. | #Standard pressure (29.92" Hg or 1013.25 millibars) resulting in the [[#Pressure altitude]]. While on the airfield the altimeter will not display the altitude. It will display the barometric pressure expressed in feet. It provides a standard altitude reading above a certain height. | ||