ATR Electric Query
Thanks all for your replies.
Trackdiamond I am a trained engineer on ATR 42-500. I have no problem with understanding the architecture or working of the electrical system. Rather I was wondering why turbo props including ATR use DC as primary system instead of AC as on larger commercial jets. This unfortunately is something that the instructor failed to address during the type course. In light of the above answers I can only deduce that the biggest advantage lies in using the DC electrical machine as a starter as well as a generator.