Example cited was definitely 10deg either side of vertical, referenced by the AHRS/EADI which is pretty accurate! I think we had an SOP limit of 6deg but it was a crew change day and you know those guys will always report pitch/roll/heave below limits when they want to go home. Once you're on the deck and you find it's going 12deg either way (i.e. double what was reported) and there're pax crawling around on the deck and the doors are open then your options are limited. But the aircraft was stable up to 10deg, although obviously I wouldn't write that as a limit in the SOP's because 10deg in pitch axis and the S76 will start to slide off a slick deck (vessel in question was a small seismic with aft deck).