Summary
Inspect hub and airfoils for signs of damage. Remove airfoils for further inspection if hub material is cast aluminum. Check tightness of all mounting hardware with a torque wrench. Check breather cap (if applicable). Check oil levels (if applicable) and inspect any signs of leakage. Check safety cables. If guy wires are present, check tightness. Check mounting method. Check that the fan is plumb and level. Inspect whole fan for signs of corrosion, discoloration, pitting, or flaking of metal. Check dimensions of any supplemental steel supports. Visually inspect welds. Check wiring methods. See attached file.