This document, in its second edition, is a set of medical requirements in the medical certification of Air Traffic Controllers (ATCOs), for application in ECAC1 States. The document has been revised by the ATCO Medical Requirements Task Force (AMRTF) as a result of developments in aviation medicine and in the operational environment. The document now also includes guidance on the training of Authorised Medical Examiners (AME), a sample European Class 3 Medical Certificate, advice for the holders of air traffic controller licences in the event of a decrease in medical fitness and a summary of Minimum Periodic Requirements.