To me flying around on one engine (in a twin) is an abnormal op, if the second one fails then that's an emergency!
Although in my QRH anything to do with an engine failure (causes etc) is in the red section of the book & are memory recall items, meaning an emergency. The procedure/s for handling flight (such as ldg on one eng.) after the event is covered in the abnormal section.
At the end of the day one would have to wonder if it's wise to travel on any plane not long out of maint! I believe this is identified as the most risky time of flight.
CW