Originally Posted by
hans brinker
Your level of knowledge of certification is not something I will ever approach. But either the KC-46 was over engineered/certified having dual channel MCAS and a comparator annunciator, or corners were cut with the MAX, when they made it single source. And they definitely made it single source to avoid training and the associated cost. Maybe they thought is was safe enough, but they would have known that is was less safe, and cheaper.......
KC-46 MCAS is fundamentally different than 737 MCAS. On the KC-46, it's intended to account for everyday occurrences - the rapidly changing CG as the tanker offloads fuel. Different design requirements when you design something to account for what will routinely happen.
737 MCAS was intended to account something that should rarely occur - the pilot flying the aircraft into a near stall condition. So MCAS would rarely come into play - again, a different design requirement.
Not excusing the sloppy engineering that resulted in the original MAX MCAS implementation, but comparing it to the KC-46 MCAS is apples to oranges.