How accurate should airworthiness directives be? Before you answer that question, let me give you an example of an actual AD applicable to the Airbus A318/319/320/321 and then you can decide whether the information provided is sufficient for a mechanic to perform the required maintenance properly. I know you’re not all mechanics, but I don’t think you need to be one to see the problem. And if you fly or maintain GA aircraft, and think this issue doesn’t apply to you, think again. If the FAA doesn’t scrutinize ADs for large aircraft that carry millions of people around the world, just how much scrutiny do you think it’s giving ADs applicable to GA aircraft?
As you all know, airworthiness directives are issued only when a known safety problem exists and that problem is likely to exist or develop in other similar products. To quote the regulation exactly, FAR 39.3 states, “The FAA issues an airworthiness directive addressing a product when we find that: (a) an unsafe condition exists in the product; and (b) the condition is likely to exist or develop in other products of the same type design.”