Originally Posted by
High_Expect
Pan... Mayday is imminent danger. As you're now flying a single engine aircraft like most others it's hardly life threatening.
There are some airplanes unable to maintain altitude on one engine. I'd consider that imminent danger
FWIW, it's not necessarily considered an emergency at my company if one engine fails. However it's mandatory to declare an emergency on failure of a second engine (4 engine airplane). That's more of a company policy thing, I don't ever recall reading any regulation which specified that.