I am a commercial pilot, A&P IA, and DER aircraft engineer. I work assiduously to ensure that everything on the airplanes I approve is absolutely perfect, but throughout my 60 year career, I have seen failures of just about every aircraft system. Airplanes are designed and maintained by humans, so some errors will creep in. These errors can be overcome only by another human, the trained and professional pilot. It do not often praise the FAA, but in this instance I am proud of them.