According to the new rules on the Turkish CAA website, the 1500TT requirement is only applicable to ICAO licence holders. For EASA or JAA license holders there is no minimum requirement. Furthermore the licence validation which all foreign licence holders have to get, will also not be applicable anymore to EASA or JAA holders. The company that you will work for just has to get a document called 'yetki belgesi' which is valid for the duration of your employment.
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