NTSB Identification: NYC99IA239.
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Incident occurred Sunday, September 26, 1999 in NANTUCKET, MA
Probable Cause Approval Date: 04/06/2001
Aircraft: Israel Aircraft Industries 1124, registration: N666K
Injuries: 4 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

While in a climb after departure, the left engine failed. All procedures were accomplished to secure the engine and the airplane landed uneventfully. Examination of the airplane revealed extensive damage to the left engine nacelle and turbine section. The first stage low pressure turbine rotor disk was found separated from the low-pressure turbine shaft, and had penetrated the inner stage transition liner. The engine was removed from the airplane and disassembled. The disassembly revealed the first stage low-pressure turbine (LPT) had a piece of the web and rim, missing outboard of the curvic coupling. Metallurgical examination of the ruptured first stage LPT disk revealed a high cycle fatigue failure that originated from the subsurface location. The disk's dimensions adjacent to the fracture and the disk's material properties conformed to engineering specifications.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

A fractured turbine wheel.

Full narrative available

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