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Transponder Mandatory Zone (TMZ)

A Transponder Mandatory Zone (TMZ) is a defined area where carrying and using a transponder transmitting the barometric altitude of the aircraft’s altimeter is mandatory.

The pilot must set the published TMZ code in the transponder before flying into a TMZ. In addition, the pilot must listen to the corresponding published frequency and be available for two way voice communication at all times.

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With friendly permission of DFS Deutsche Flugsicherung GmbH. Not to be used for navigational purposes!

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