Old Aero Guy,
Thank you for your comprehensive reply. I appreciate it very much as it appears to answer to points that I've had troubnle getting out of Seattle. In essence, it seems that no independent fatigue testing was done, only by delta analysis of the 737 classic structure. I have no doubt that it DOES meet the criteria (it has to) - I was being a little facetious in order to prompt a response such as your own. I don't believe that Boeing gets a sweetheart deal as far as certification is concerned on things this important (though we could debate all day long the rudder issue resolution), but I thank you once again for your time and your explanation.
Best wishes,
p-k-b
Back to original thread......