Originally Posted by
mryan75
and check this one out, and this guy had an ATP. And he still needed common purpose with his passengers for the operation ey ran (which the FAA determined he did not have).:
Thanks for that link, it was very informative. It seems that FAA has a stick called "common purpose" that they are prepared to wield when it suits them but it is not linked to any regulation that a private, commercial, or even ATP rated pilot could be expected to know about. 61.113(c) does not mention "common purpose" yet FAA uses it as a reference for their common purpose interpretation.
If they want a rule for pilots to follow it would seem reasonable for it to be included in the regulations that pilots are expected to know about.