Originally Posted by
Ewfflyer
99% of these you will not be legal to log the SIC time, because all of these planes are single-pilot approved, and I'm almost 100% guarantee'd that they have an autopilot, so even 135 they don't need the SIC. You can log any 91 legs assuming you have all endorsements including High-Perf, High-Alt, etc..(421s'/414's require high-alt endorsement).
I don't believe it matters that they have an autopilot. Two pilots are required under pt. 135 for IFR. An exception to the rule is made if there is an operating, approved autopilot, and in this case one pilot is allowed. Doesn't mean that two pilots are NOT allowed.