Originally Posted by
43Inches
And that is one of the worst case scenarios for fault finding an incident, the aircraft system not registering a fault, but a fault witnessed by multiple sources outside of the system, like the human component. That's when a plane will sit for long periods to work out the why and how.
Absolutely , if I remember correctly that was the case here :
Martinair B767 Boston 1996
Where it took quite some time to understand what happened.