Originally Posted by
longliveKA
Actually, the photo might not be very clear, but there is a short patch of metal about 10cm x 5 cm on the edge of the propeller. I saw this on several of the blades. Just speculating if this is for balancing of the blades, or to cover small dents/cracks? Props where definitely working :-) fortunately for me :-))) but I never saw this kind of patch before so...
The following from a blog written by an American shows duct-tape was used on the propeller of a US public aircraft somewhere in the USA (Colorado it seems)..
http://tiltjames.com/duct-tape
Since this happened in the USA (where litigation reigns supreme) it must be an OK thing because the aircraft mechanics are all licensed and certified (by the FAA I think). If am aircraft mechanic breaks "da rules" they lose certification, yadda it would seem.
If no aeronautical engineer says otherwise, I'd let this one go as an authorized operating procedure.