A word of warning though, if you don’t lock the rotating assembly, somebody will put fingers in and turn the Compressor. I know 300 series and think some, if not all the others had an anti rotation brake fitted which meant the engine will only turn one way. What happens is the inertia of the big rotating mass drags fingers in and they get wedged. You can’t turn the engine in the opposite direction because of the stop, so the only way to get the trapped fingers out is to get the bolt croppers out of stores. (I would strongly advise that they are used on the blades not the fingers – however, the preservationist in me thinks otherwise!)
A&P student I knew about 20 years ago wound up a jet engine by using a finger… & then his hand slipped, neatly removed his digit at the 2nd knuckle. Not sure if they ever took the engine apart to get the finger out, I know we could smell the damn thing rotting away for at least a couple of weeks after..
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