Joker, as far as I am aware no non-Turkish hold Turkish DGCA licences, the foreign pilots are flying on their own licences with a " Permission to fly" not a " validation. ( some dual nationality guys have both German and Turkish licences) IF, and it is IF! the DGCA give non- nationals Turkish licences then the EASA state members can retain their own licences but re-validation of type ratings will have to be done by an EASA approved ATO or Examiner, presumably at the cost to the individual concerned as the Company will have no obligation to do this. At the moment, UK licence holders will need their revalidation done outside Turkey and this will be the same for Swiss and Hungry from 8th April, Germany and rest of EU will follow later in year.