ASN Wikibase Occurrence # 131699
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| Date: | Tuesday 7 May 1991 |
| Time: | 13:10 LT |
| Type: |  Bell 206B-3 JetRanger III |
| Owner/operator: | Contractors Helicopters |
| Registration: | N717NH |
| MSN: | 2847 |
| Year of manufacture: | 1979 |
| Total airframe hrs: | 2966 hours |
| Engine model: | ALLISON 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Lockwood Drive, Market Street, Houston, Texas -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Houston, TX (N/A) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
WHILE ON A FLIGHT OVER METROPOLITAN HOUSTON TO GET AERIAL VIDEO FOOTAGE, THE MAIN DRIVE SHAFT COUPLING FAILED & THE PILOT WAS FORCED TO MAKE AN AUTOROTATION. HE TRIED TO LAND IN A PARKING LOT, BUT WAS UNABLE TO REACH IT. SUBSEQUENTLY, THE HELICOPTER CRASH LANDED ON THE ROOF OF AN APARTMENT HOUSE. AN INVESTIGATION DISCLOSED THE ENGINE MOUNT WAS OIL SOAKED & HAD DELAMINATED, CAUSING MISALIGNMENT OF THE DRIVE SHAFT. ALSO, A LACK OF LUBRICATION WAS NOTED IN THE MAIN DRIVE SHAFT COUPLING. OTHER MAINTENANCE DISCREPANCIES WERE ALSO NOTED DURING THE INVESTIGATION.
Probable Cause: ENGINE MOUNT DELAMINATION AND LACK LUBRICATION, CAUSING THE DRIVE SHAFT TO FAIL. POOR SERVICING OF THE HELICOPTER WAS A RELATED FACTOR.
Accident investigation:
 |
|
Sources:
NTSB DEN91FA068
FAA register: 2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=717NH
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 18-Apr-2016 17:02 | Dr.John Smith | Updated [Location, Nature, Departure airport, Destination airport, Source, Narrative] |
| 18-Apr-2016 17:15 | Dr.John Smith | Updated [Operator, Location, Destination airport, Source, Narrative] |
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 21-Apr-2024 06:41 | ASN Update Bot | Updated [Time, Operator, Total occupants, Other fatalities, Phase, Nature, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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