JD
I have heard of a number of 60's that ECU lockout checks on one engine resulted in damage to or loss of the aircraft. The highest visibility one was the HMX-1 ship. So the prescident has been established of unintended consequences when testing engine failure modes and those made it to the presidential fleet.
Report still remains doing engine out (one) testing at extreme of the airspeed range rpm was lost resulting in loss of the aircraft. As to what the crew felt or perceived prior to the event is still being analyzed.
The Sultan