Great advice John. As another datapoint, I was walking along the
parking ramp to my aircraft and a Bo started up when I was by his
wingtip walking towards the prop. He didn't do ANYTHING to notify
anyone that he was starting, no beacon, no nav lights, and most of all,
no "clear prop" call-out. I gave him a dirty look while he looked up
with a surpised look on his fat, dumb and clueless face. Had he called
out from his side window, I would have heard him clear as day.

That day made sure I would never forget that checklist item.

Marco

JGalban wrote:

The purpose is the same as it's always been. To warn anyone nearby
that the prop is about to turn into a meat grinder. I'm not sure what
you're flying, but many of the planes I fly do not allow me to see
everything around me. Also, I've had my head in the cockpit for the
past few minutes, performing the prestart checks and I haven't been
concentrating on the movements of passerbys.