FAA review

Of course there are the standards which must be met. I would not expect any overt departures from those.

I would suspect there are also guidelines on how to interpret those standards. However, the variation due to the reputation of the particular AME with the FAA as well as essentially random factors, like how much coffee the reviewer had, is likely substantial. These people have typical government bureaucrat jobs and aren’t that much different from those at any regulatory agency.
 
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