@aviationdoctor.eth
A fuller picture is starting to emerge from the UPS flight 2976 accident on Nov. 4 in Louisville, KY.
The left engine separated during the takeoff roll for reasons that are yet to be determined (installation error, undetected fatigue cracks, etc.). This was bad enough on its own, but survivable barring serious damage to the wing structure, including hydraulic lines and flight controls. The MD-11 could have taken off on the remaining two engines, albeit with some fine piloting given the asymmetric aerodynamics and thrust.
What sealed the flight's fate, though, is that some debris was ingested by engine #2 (the one at the base of the vertical stabilizer), causing a compressor stall. With only one engine left running (#3), the MD-11 no longer had sufficient thrust to take off, circle around, and land.
Whether this all happened before or after the decision speed (V1) at which takeoff can no longer be rejected is yet to be determined. Regardless, as long as the pilots only realized the situation after V1, there was nothing else they could have done to change the outcome; there was not enough runway to stop the plane before the hard obstacles anyway. Sadly, they were just passengers on their own flight by that point.
There is one precedent of engine separation on a DC-10, which is of a similar trijet design as the MD-11. That was flight AA 191 in 1979; the left engine fell at takeoff due to incorrect maintenance. The accident killed 271 people on board and 2 more on the ground, and was the deadliest air disaster in U.S. history back then.
I wouldn't be surprised by calls for an accelerated retirement of the remaining MD-11s in service; the one that crashed (N259UP) was 34 years old, a venerable age (FedEx, for one, plans to phase out its own MD-11s by 2032). Of the 200 MD-11s ever produced, only 56 remain in service today, and all in cargo operations (the last passenger service was in 2014).