Due to some work circunstances, I am working with Pixhawk+PX4 in an expensive fixed wing UAV. As I have little experience with the Pixhawk, I was wondering what was the community opinion on developing some sort of extra circuit which would multiplex the RC signal directly to the servos when triggered (by the RC itself for example). This is mainly so an experienced pilot can take full manual control in case the Pixhawk stops working, or even shuts down entirely.
Is there any merit to this idea? Or is the rate of failure of the Pixhawk+PX4 is low enought that adding it is pointless (or even prejudicating the system)?
Is there any documentation on number of flight hours or certification for Pixhawk+PX4?
Thank you for your help