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Altitude: Difference between revisions
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→Indicated altitude: set altimeter without qnh
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(→Indicated altitude: set altimeter without qnh) |
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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]]. | #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 airfield is known, the alitimeter can be set on the height of the 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. | ||