You mainly see "excessive redundancy" in larger cargo, passenger, and military aircraft. Small general aviation airplanes don't have as many redundant systems a

You mainly see "excessive redundancy" in larger cargo, passenger, and military aircraft. Small general aviation airplanes don't have as many redundant systems as you'd think. There is neither the space or weight budget. For safety, they mainly rely on well engineered systems, frequent inspections, required maintenance and updates, and failsafe design, such as the ability to pilot the plane as a glider if the engine cuts out.