Part 66 is the aviation regulation prepared and issued by The European Aviation Safety Agency – EASA, that explains
– The categories of licences and their privileges,
– How an aircraft maintenance personnel can get an aircraft maintenance licence and
– How to endorse an aircraft type into the Licence.
Solely licensed aircraft engineers are allowed to certify the work that has been carried out on an aircraft and return it to service in Line or base maintenance in an EASA Part-145 approved Maintenance Organisation.