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For the ATC experts,
some foreign airports have different transition level and altitudes. For example, TA is 5900' and TL is 100. Are the altitudes in between unusable? Is there a time when they are assigned or can be used?
Thanks
All foreign airports have a different Transition Level TL, and Transition Altitude
TA. Transition Altitude is used for departure, Transition Level is used for arrival. Transition Altitude is on your Jepp chart, Transition level is assigned by ATC. Normally on the ATIS. Just listen to what the ATC controller says. On arrival if the controller says you are cleared to four thousand feet on the QNH of 1022 you should change your altimeter setting to 1022 and descend to 4000'. If the departure controller says you are cleared to Seven Zero you are cleared to FL70 and you should change your altimeter to 1013.2 and climb to FL70.The only caution is that if the QNH is below 1013.2 you should not change your altimeter until you call "flaps up". This will avoid the problem of cleaning up early and getting a noise violation.
True, some country's publish it on the jep pages.Transition Level is not always assigned by ATC, depends on the country.