The Transition Level (TL) is the point where you need to change your altimeter setting from the standard 1013 hpa to the local QNH.

By the end of this video, you will know what the TL is, why it is important and how can you calculate the Transition Level.

When you fly above the Transition Level you must fly using the FLIGHT LEVELs, and when flying below the TL you must fly altitudes.

Why does it work in this way?

When the terrain is no longer a factor and you fly above the transition altitude, you use the standard 1013hpa as a reference in your altimeter in order to maintain the separation with other traffics.

This guarantees that all the Aircrafts flying above the transition altitude use the same pressure reference.

But once you get close to the ground you want to use the pressure at the mean sea level as a reference in order to maintain the separation with the traffic and also with the terrain (The top of the elevation of the mountains are taken from the mean sea level).

So the Transition Level gives you the exact Flight Level at which you have to change the altimeter setting from the 1013hpa to the local qnh.

The TL is reported on the ATIS or by the Air Traffic Controller.

To watch the Transition Altitude Video watch the following:
[ Ссылка ]

To understand how does the Altimeter Pressure references work watch the below video:
[ Ссылка ]

Standard Atmosphere Video:
[ Ссылка ]

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Disclaimer:
THIS VIDEO IS FOR ENTERTAINMENT PURPOSES ONLY.
NOT FOR REAL-LIFE OPERATIONS.
PLEASE REFER TO THE OFFICIAL MANUAL AND DOCUMENTATION.
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