Compressor failure in Marbore Engine

Summary and conclusions• The reason that this cracks were not found until now is because themaintenance policy for NDT enabled choosing between inspection underlow magnification or fluid penetration (Zyglo) method.• From the other disks that were found with cracks, it can be concluded thatanother severe event was prevented due to this investigation.• From the amount of corrosion pits and the difficulty to see the coating itcan be concluded that the protective coating was damaged and was notaffective.• The probability of FOD (Foreign Object Damage) as a cause of the failurewas ruled out.– There were no signs for FOD over the stainless steel disk– Other disks were found cracked (with smaller cracks).24