Serious Incident to an ATR 72 registered YR-ATI operated by Romanian Air Transport on 03/16/16 at Budapest [investigation led by TSB / Hungary]

Preliminary data based on the notification from the Hungarian authorities:

During take off from LHBP the flight crew observed an RPM fluctuation from the engine N°2. After this the engine N°2 real fire warning signal came on and the crew activated the fire extinguishing system. MAYDAY was declared. The crew decided to turn back to departure airport and landed safely at the LHBP airport.