Oh man these regs confuse the hell out of me sometimes.
So when I flew 121, I logged PIC when I acted as PIC. And at that company the guy sitting next to me was not typed in the aircraft so he logged SIC.
Now, I fly 91 where I am designated Captain/PIC on all trips/paperwork. I fly with another guy who has the same type rating/qualifications I do. We are both qualified as PIC under 91 for this aircraft. He claims we can both log PIC time during all flights, regardless of whether acting as PF or PNF. I say he is wrong. I have been logging PIC time for the legs I fly, and not logging PIC for his legs.
Another can of worms: When we have a third/relief pilot on these 91 legs, one of us sits in the cabin and rests. So if that relief pilot happens to be me for 2 hours out of a 7 hour flight, what do I log? 5 hours PIC? Or 7 hours PIC? I have been logging neither PIC or SIC for the time I am asleep. But of course, who is the PIC during the time I am sleeping?
Ideas?