ASN Wikibase Occurrence # 369052
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| Date: | Wednesday 22 March 1989 |
| Time: | 20:30 LT |
| Type: |  Bell 206B |
| Owner/operator: | Dooley Helicopters Inc |
| Registration: | N5004F |
| MSN: | 2443 |
| Year of manufacture: | 1978 |
| Total airframe hrs: | 4894 hours |
| Engine model: | Allison 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Atlanta, GA -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Ferry/positioning |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DRG TAKEOFF FROM A HELIPAD AT DUSK, THE ENG LOST PWR AS THE HELICOPTER WAS CLIMBING THRU APRX 75' AGL. THE PLT INITIATEDAN AUTOROTATION TO A PARKING LOT, WHICH REQUIRED THE USE OF COLLECTIVE TO REACH THE LOT. SUBSEQUENTLY, THE HELICOPTER HIT AN ELECTRICAL WIRE OVER THE PARKING LOT, THEN CRASHED. AN EXAM REVEALED THE TURBINE SPUR ADAPTER GEARSHAFT HAD FAILED FROM FATIGUE. ALUMINUM RICH METAL DEBRIS WAS FOUND BLOCKING THE OIL DELIVERY TUBE TO THE GEARSHAFT; THE OIL INLET SCREEN FILTER WAS MISSING; AND THERE WAS EVIDENCE OF OVERHEATING & EXCESSIVE WEAR OF THE GEARSHAFT SPLINES. THE 100 HR INSPN CHECKLIST FOR THE ENG REQUIRED THE REMOVAL & INSPN OF THE ENG OIL SYS FILTER. WITH THE FILTER REMOVED, THERE WAS DIRECT ACCESS TO THE SPUR ADAPTER GEARSHAFT OIL DELIVERY TUBE & THE OIL TUBE CONNECTOR ASSEMBLY CUP FILTER.
Probable Cause: FATIGUE FAILURE OF THE ENGINE SPUR ADAPTER GEARSHAFT IN AN AREA WHERE THERE WAS A LACK OF LUBRICATION (OIL STARVATION) DUE TO A PARTIALLY BLOCKED OIL DELIVERY TUBE. CONTRIBUTING FACTORS WERE: INATTENTIVE MAINTENANCE OR SERVICING OF THE AIRCRAFT BY UNKNOWN MAINTENANCE PERSONNEL, THE LIGHT CONDITIONS AT DUSK, AND THE ELECTRICAL (TRANSMISSION) WIRE.
Accident investigation:
 |
|
Sources:
NTSB ATL89FA112
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Mar-2024 10:19 | ASN Update Bot | Added |
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