Originally Posted by
bsieker
And I would assume that when you do these inspections, the easiest way is in fact to just number the blades and their position on the disk with a permanent felt-tip marker.
Bernd
The Chlorine based ink used in permanent markers reacts with Titanium, the main component in modern fan blades. This has the potential to be the initiating point for a stress fracture site. The law of unintended consequences?
It is rather ironic that innocent actions during the maintenance and inspections designed to detect and prevent fan blade failure could actually be responsible for some recent failures.