er ... "Failsafe" ?
I have a vague memory that the concept of "Failsafe" is that a system can be put into a state which is intrinsically safe.
For example, railway signals used to be DOWN for stop. In the event of the signalling system failing, all trains would just stop at the next signal. Leaving the system in a "safe" condition.
I also believe there's no failsafe for an aircraft in motion. I.e: there is no way to set the controls to keep the aircraft permanently safe (even a car would just come to a stop when power is remove).
Biting the hand that feeds IT
