Originally Posted by
propjunkie
I am a little skeptical about logging SIC on a single pilot airplane operated under part 91. there are no "legal" opspecs that require an sic.
The only one under regular Part 91 ops is safety pilot ops under 91.109, If the safety pilot is not the one acting as PIC, he is considered to be a SIC and permitted to log it as SIC. So much so that under 61.55, if the safety pilot op is done under IFR (say in VMC but on an IFR flight plan) the safety pilot must be instrument rated.