So I have been doing boroscopes for a while and have noticed the higher time RB211-535E's have damage to the HPT (high pressure turbine blades) at the blade root trailing edge. Nothing to get excited about most of the time because it is within maintenance manual limits. But what is causing this damage on the roots when the noozle guide vanes in the combustion section have little or no damage????
HPT notice the dark area of the blade, (lower left corner of picture) this is the area of damage
Typical damage of high time engine of HPT
If anyone has any insight or knowledge of this I would be curious to understand the cause of damage to just this area and not the whole blade.
[Edited 2013-01-21 08:35:54]