BTW. Do not assume numbers written on blades correspond to their position as per the AMM. The numbers may have been wriiten to aid blade removal and re-installation and may bear no relation to the actual blade number.
Very true. I was once dropped in the sh1t by this. I went out to Karachi with a set of fan blades for a RB211 after a bird strike there. We fitted the blades nbr 1 to 33 ACW as marked on the blades. Their was still fan vibration afterwards and we ended up doing a two engine ferry back to BAH.
On arrival, I was given the fan blade fitment sheet that the engine shop had found. The blades had been balanced on a rig at RR, and the fitting sequence bore no relation to the numbers. Me and 250 Pakistani passengers were not amused.