Sensors, actuators and algorithms, observability and controllability
Hi A33Zab,
You are pointing other systems' faults... If sensors are missing for any reason and observability cannot be reached in the closed loop you must modify or add sensors, perhaps threads of wool on the frame! Engineers will be able to find something if the certification guys get able to verify observability and controllability.
And the same with controllability and missing actuators. Pilot intervention is possible only so long you have an actuator to jump in the loop again, creating a system interruption and doing the correction quickly enough...and adequatly, if it is possible (the 30 seconds don't fit, too slow)
We are in the time to reject every fault in systems, from A, B or C.