About the accident in Hungary: the police investigation has been apparently closed, and the cause was ruled to be pilot error (If I understand it correctly, they did a too severe turn too low). There was no sign of a fire before the crash, so even though the wreckage burned out, the crash was not due to electrical issues or fire. A hungarian news article: https://hvg.hu/itthon/20190401_magnus_aircraft_elektromos_ki... (Unfortunately I couldn't find an English article, and the accident investigation of the transportation safety organization might not be finished yet, since they only issued a preliminary report for now.)