Originally Posted by
Semreh
There are two things that take precedence before communicating with ATC. It is premature to draw a conclusion from (presumed) radio silence.
I am not drawing any conclusions. I do find it difficult though to believe a (simple) engine fire would require such aviation and navigation that a quick mayday to secure a free flight path would be too much.
And if you do return to a busy international airport, communication might be important to at least alert other aircraft and ATC of a deviation of the expected path.
Again, no conclusions, but if I were a betting man, I would not put any money on an engine fire as sole reason.