Originally Posted by
plasticpi
There is no required type rating OR endorsement in 61.55 to just act as SIC during domestic operations, you only need an endorsement to get the SIC type rating that's required if you want to fly outside of US airspace.
I would agree. I don't see anywhere it says you have to have an endorsement. The only documentation I see required is logging 3 takeoffs and landings and OEI procedures in the last 12 months.