Look for surface damage on both sides of the blades such as
dents, nicks, scratches, and corrosion. Surface imperfections can also be felt by running your
fingernail along the blade leading edge. Damage should be repaired before flight. Whenever a
noticeable dent, nick, corrosion pit, or bump is observed, an appropriately rated mechanic should
blend it out. The mechanic should remove all corrosion products and determine that the section
thickness has not been reduced below allowable limits. Allowable thickness limits should be
obtained from the manufacturer’s maintenance manual, or other FAA acceptable propeller
inspection criteria.