But is is not also listed in the FARs that the Pilot in Command is the ultimate authority of determining airworthiness before each flight? And have there not been cases like this where some AP says an airplane is not airworthy, when they are incorrect? In that case, the pilot is free to make their own interpretation and fly the plane to another AP for a second opinion if they wish.
§ 91.7
Civil aircraft airworthiness.
(a) No
person may operate a
civil aircraft unless it is in an airworthy condition.
(b) The
pilot in command of a
civil aircraft is responsible for determining whether that
aircraft is in condition for safe flight. The
pilot in command shall discontinue the flight when unairworthy mechanical, electrical, or structural conditions occur.
I am not saying that it is smart for every PIC to do this all the time, but it is sometimes used when an unscrupulous school, AP, or instructor is trying to ground a plane for no good reason.