Originally Posted by
encore
Say you're an ATP with thousands upon thousands of hours and plenty of ratings but have no recent experience in general aviation aircraft and no experience in the type of general aviation aircraft you're flying.
Based on lapsed currency required by FAR 61.57 (which is implied in your scenario), the ATP rated pilot would not be legal to act as PIC.
An FAA administrative law judge could possibly claim gross negligence or willful misconduct based on the ATP rated pilot's experience, however there's nothing in the FARs placing responsibility for that flight on the more experienced pilot.