On September 26, 1999, an Israel Aircraft Industries 1124 (registration N666K) was involved in an aviation accident near Nantucket, MA. Investigators recorded the probable cause as: High cycle fatigue failure of the first stage low-pressure turbine disk originating from a subsurface location. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
After departure, a left engine failed. The aircraft landed uneventfully. Examination revealed a ruptured first stage low-pressure turbine disk due to high cycle fatigue from a subsurface origin.
Incident Overview
Following departure, the left engine experienced a failure. The flight crew completed the engine securing procedures, and the aircraft landed without further incident.
Damage Examination
Inspection of the aircraft showed extensive damage to the left engine nacelle and turbine section. The first stage low-pressure turbine (LPT) rotor disk had separated from the low-pressure turbine shaft and penetrated the inner stage transition liner. The engine was removed and disassembled, revealing that the first stage LPT had a piece of the web and rim missing outboard of the curvic coupling.
Metallurgical Findings
Metallurgical examination of the ruptured first stage LPT disk identified a high cycle fatigue failure originating from a subsurface location. The disk's dimensions adjacent to the fracture and its material properties were found to conform to engineering specifications.
Probable cause
High cycle fatigue failure of the first stage low-pressure turbine disk originating from a subsurface location.
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