Feb 13, 2012
Incident
Minor Portland, OR
InjuriesNone
Phase of Flight-
ConditionsUnk
OperationFAR 121
Probable Cause
The fracture of the fan mid shaft due to a stress corrosion cracking initiated by local regions of corrosion pitting, which resulted from oil migration within the shaft and its subsequent degradation.
NTSB ENG12IA012