I’m curious why a flight school that does high routine DA operations (KAPA is at 5884.9ft according to airnav) would operate such underpowered multi engine aircraft. That doesn’t make sense. Or was this not a flight school aircraft, just a (careless) instructor teaching a customer in his own aircraft? Don’t dogpile me for calling the instructor careless: DA calculations were something we did along with weight and balance and takeoff/landing performance before every single flight I did in flight school, even though it was often in the same aircraft and the same airport, so it’s carelessness that caused this crash when 5min of routine performance calculations and POH consultation would have thrown up a red flag “hey we’re going to be operating outside of this aircraft’s single engine performance limitations”. That’s the whole reason my instruction included drilling those routine low effort calculations into normal operation; it keeps stuff like this from happening.