All of a sudden my AC unit started to make a loud rattling noise while the fan is spinning...I opened the unit up and found the fan blade by the condenser coil has cracks in every blade at the base...it looks like this is causing the blade to contact the plastic piece that surrounds it...I figure I have to replace the blade but it looks like it might be hard to access the nut holding it on because of its position - what is the best way to access the nut holding on this blade will I have to remove much of the insides to get at it...any help or suggestions are greatly appreciated

Thanks

Gary