They should audit the process in general. Too many ACOs make up their own rules even though the regulations are already in place. I was involved in a two blade fixed pitch prop STC and they were making us test to the higher standard of a 4 blade propeller. When I questioned why the higher standard the engineer said because he said so. I have never seen bureaucracy run so amuck as I did in this project. People wonder why STCs are so expensive. The STC’d prop cost twice as much as the experimental version and they are exactly the same however the cost of certification is being recouped on the STC’s version.