Originally Posted by Frangible
Why is anyone allowed to change the manufacturer's version of the FCOM?
The manufacturers business is to build airplanes, not to operate them ...
The manufacturer's responsibilty is to publish limitations and other technical informations (including performances, failures etc. ) about theyr product. Sometimes they provide recommandations that protect their liabilities but are not aimed at a real - practical - safety improvement.
Operator's business is to fly as safely as possible, making money in the process. And sometimes, first class chief pilots know their business (operating an airplane in the real world, with real pilots) much, much better than manufacturer's test pilots and lawyers ... Those guys desserve some respects, they are not "anyone".