NTSB Identification: FTW86FA007.
The docket is stored on NTSB microfiche number 31596.
Accident occurred Monday, October 07, 1985 in TOMBALL, TX
Aircraft: BELL 206L-1, registration: N515EH
Injuries: 1 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

ACFT WAS SUBSTANTIALLY DAMAGED AS A RESULT OF A HARD LANDING DURING AN EMERGENCY AUTOROTATION FOLLOWING A COMPLETE POWER LOSS. THE POWER LOSS OCCURRED AS A RESULT OF AN UNCONTAINED FAILURE OF THE NO. 1 TURBINE WHEEL. THE WHEEL BURST AS A RESULT OF A FATIGUE FAILURE OF THE TURBINE TO COMPRESSOR COUPLING WHICH ALLOWED THE SHAFT TO DECOUPLE. WHEN THE TURBINE SECTION DECOUPLED THE ENGINE EXPERIENCED AN OVERSPEED. THE ORGIN OF THE FATIGUE FRACTURE WAS FOUND IN THE SCALLOP AREA ON THE TURBINE END OF THE SHAFT. THE ENG FAILURE OCCURRED AT LOW ALTITUDE ON DEPARTURE AND THE PLT HAD TO MANEUVER THE ACFT IN ORDER TO MAKE THE ONLY AVAILABLE FORCED LANDING AREA.

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

TURBOSHAFT ENGINE,GAS GENERATOR TURBINE SHAFT..DISCONNECTED

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

TURBOSHAFT ENGINE,GAS GENERATOR TURBINE SHAFT..FATIGUE


Contributing Factors

AIRPORT FACILITIES,RUNWAY/LANDING AREA CONDITION..NONE SUITABLE

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