The FAA's previous gold-standard aircraft certification standard......
I recall that the FAA certified the B707.
The then Air Registration Board's chief test pilot flew it and refused to certify it claiming the rudder forces were too high for the average line pilot in the event of an outboard engine failure. He was backed by Lord Brabazon, the head of the ARB.
To gain British certification, if I recall correctly, Boeing fitted a bigger rudder which, funny enough, they retrofitted, free of charge, to aircraft already flying.
A later model had an undesirable pitch up approaching the stall. The FAA certified it, the British wouldn't. A stick pusher was fitted and, similarly to the bigger rudder, Boeing retrofitted the pusher to aircraft already flying.
Gold standard indeed.