Originally Posted by
S.o.S.
It used to be, and I hope still is in most places, that a sleeve would be put on one of the blades and tethered to the u/c or suitable point to prevent it wind-milling.
I don't think that nowadays ground staff have time to do that on an average turnround.
Most of the (fortunately few) workers who have been killed or seriously injured by a prop on the ramp have walked into a spinning one, which can be difficult to see in certain conditions.
My longstanding respect for props stems from a spell at LHR in the 70s when (among other things) I did turnrounds on Ilyushin Il-18s, where the ground power receptacle was midships, roughly abeam the engines, and of course you didn't disconnect it until all 4 Ivchenkos were running ...
PPRuNe: Safety around propellers