On July 6, 1989, a Bell 206L-1 (registration N2137U) operated by Kenn Aire Medical Corp. was involved in an aviation accident near Chiefland, FL. Investigators recorded the probable cause as: The separation of a component from the first stage turbine wheel disk, which resulted in the turbine section locking up and subsequent engine failure. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A helicopter experienced a sudden engine failure while on final approach near the designated pickup area at approximately 300 feet altitude, prompting an autorotation landing.
What happened
The flight was approaching its designated pickup area when the aircraft was approximately 300 feet above ground level and established on the final approach segment. During this phase of flight, the pilot heard a distinct noise originating from the engine section. In response to the mechanical anomaly, the pilot initiated an autorotation into an adjacent field.
The investigation
Following the incident, investigators examined the turbine section of the aircraft's powerplant. The examination revealed that the turbine was locked up. Subsequent disassembly of the turbine module exposed the root cause: a piece of the first stage turbine wheel disk had separated from the assembly.
Probable cause
The separation of a component from the first stage turbine wheel disk, which resulted in the turbine section locking up and subsequent engine failure.
What happened in the 6 Jul 1989 Bell 206L-1 accident near Chiefland, FL?
A helicopter experienced a sudden engine failure while on final approach near the designated pickup area at approximately 300 feet altitude, prompting an autorotation landing.
What aircraft was involved and where did it happen?
The accident on 6 Jul 1989 involved a Bell 206L-1, registration N2137U, operated by Kenn Aire Medical Corp., at Chiefland, FL.
What was the probable cause of the accident?
The separation of a component from the first stage turbine wheel disk, which resulted in the turbine section locking up and subsequent engine failure.
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