Dec 19, 1993
Incident
Minor MELBOURNE, FL
InjuriesNone
Phase of Flight-
ConditionsIMC
OperationFAR 091
Probable Cause
WAS INADEQUATE QUALITY CONTROL BY THE ENGINE MANUFACTURER WHICH RESULTED IN FAILURE OF THE SECOND STAGE LOW PRESSURE TURBINE DISK DUE TO A MACHINING ANOMALY AND REDUCED FATIGUE STRENGTH DUE TO SUB STANDARD HEAT TREAT PROCESSING.
NTSB MIA94IA040