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Transition Altitude

Definition

The altitude at which pilots change from QNH altimeter setting to standard pressure setting (29.92 inHg / 1013.25 hPa). In the US it is 18000 feet. Below this altitude, local QNH is used.

Related Terms

Flight Level(FL)

A standard pressure altitude expressed in hundreds of feet with the altimeter se...

Altimeter Setting(QNH)

The barometric pressure adjusted to sea level used to set the altimeter so it re...

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