Quote "After each period of 25 hour inspection has to be repeated again using magnifying glass and color-luminiscent-defectoscopy."
In the case of the Puma blades involved the visual check did not find cracks early enough. Eddy current inspection was approved for the inspection as the cracks that had caused failure in the past were not visible to the eye with the painted blade.
Blakmax comments on the blade are spot on, how on earth did this design of tail blade get fitted?