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The altitude at or below which the vertical position of an aircraft is controlled by reference to altitudes.
According to PANS-AIM, the transition altitude is only required for airspaces listed in section "AD 2.17 ATS airspace" (e.g. CTR).
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| In AIXM 5.1.(1) , the transitionAltitude is an attribute of the AirportHeliport feature. There is no association between the Airspace feature and the AirportHeliport feature in AIXM. |