On August 4, 1989, a Bell 206-B2 (registration N96117) operated by Imperial International Inc. was involved in an aviation accident near Sebeka, MN. Investigators recorded the probable cause as: The fracture of the first stage turbine wheel due to thermal fatigue cracking. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A pilot experienced a sudden engine failure during an approach, resulting in a hard landing due to loss of tail rotor control after the turbine wheel fractured.
What happened
The pilot was conducting an approach to a field site when he suddenly heard a loud bang. Immediately following this noise, the aircraft's engine out light illuminated and an audio warning sounded. The pilot initiated a forced landing procedure. During the maneuver, the helicopter experienced a loss of tail rotor control, which resulted in a hard landing.
The investigation
Following the accident, the engine was removed from the aircraft for teardown and detailed examination. The inspection revealed that the first stage turbine wheel had fractured. Analysis determined that the fracture was caused by thermal fatigue cracking.
Probable cause
The fracture of the first stage turbine wheel due to thermal fatigue cracking.
What happened in the 4 Aug 1989 Bell 206-B2 accident near Sebeka, MN?
A pilot experienced a sudden engine failure during an approach, resulting in a hard landing due to loss of tail rotor control after the turbine wheel fractured.
What aircraft was involved and where did it happen?
The accident on 4 Aug 1989 involved a Bell 206-B2, registration N96117, operated by Imperial International Inc., at Sebeka, MN.
What was the probable cause of the accident?
The fracture of the first stage turbine wheel due to thermal fatigue cracking.
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