Ok, thanks again. It's a RR Trent engine. I'm guessing the asterik is under the hub? Just how bad is it for the titanium blades if you mark them with a sharpie? That must be why they don't do it anymore
Depends on where you mark them. The lowest stress area is the bottom of the root attachment. But I wouldn't recommend you do any marking with any tool that hasn't been OKd by the manufacturer. You can get away with a variety of markings on titanium in the cold fan section that you can't use on titanium in the hotter sections of the engine. That goes for tools as well