ASN Wikibase Occurrence # 140474
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| Date: | Thursday 1 December 2011 |
| Time: | 10:05 |
| Type: |  Bell 407 |
| Owner/operator: | Phi Inc |
| Registration: | N435PH |
| MSN: | 53891 |
| Year of manufacture: | 2008 |
| Total airframe hrs: | 4769 hours |
| Engine model: | Rolls Royce 250-C47B |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | None |
| Category: | Incident |
| Location: | Gulf of Mexico, LA -
 United States of America
|
| Phase: | En route |
| Nature: | Offshore |
| Departure airport: | EC-278C |
| EC-261 | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While maneuvering for a precautionary landing to an oil rig platform because of a chip light indication, the helicopter's engine lost power. The pilot entered an autorotation, called mayday, inflated the helicopter’s floats, and performed a successful water landing. The pilot and passenger were able to exit the helicopter unassisted into a life raft and were picked up within 10 minutes. Examination and disassembly of the engine revealed the No. 2 bearing had failed. Metallurgical examination of the bearing showed the No. 2 bearing outer ring cracked in fatigue due to false brinnelling, which occurs in cases where the bearing is stationary but is subjected to ambient vibration or shock during transport. A spalling area was severe enough to propagate mechanical stress in the outer ring causing the ring to fracture. The engine compressor section was overhauled 2.7 hours before the failure.
Probable Cause: The failure of the compressor section No. 2 bearing due to false brinnelling and fatigue.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 18-Dec-2011 16:30 | Geno | Added |
| 06-Mar-2013 02:35 | TB | Updated [Time, Operator, Location, Phase, Source, Damage, Narrative] |
| 06-Mar-2013 02:38 | TB | Updated [Damage, Narrative] |
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 27-Nov-2017 18:13 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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