3legs,
I used to fly as a safety pilot in a beech 200. I have a frozen atpl(mcc included) but no type rating. The aircraft was a corporate machine with full time company pilot. It was certified single crew and there was no AOC. I only ever logged "other flying" in my logbook and did not include anything in my 'total flying hours'. It would have been nice to be able to log twin turbine time but alas not to be! Good experience though.