ASN Wikibase Occurrence # 132272
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| Date: | Tuesday 3 January 1989 |
| Time: | 12:50 |
| Type: |  Bell 206B-3 JetRanger III |
| Owner/operator: | Petroleum Helicopters (PHI) |
| Registration: | N22704 |
| MSN: | 3614 |
| Year of manufacture: | 1982 |
| Total airframe hrs: | 8213 hours |
| Engine model: | ALLISON 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | S. Timbalier 151 Offshore Platform, Gulf of Mexico, off coast of Texas -
 United States of America
|
| Phase: | En route |
| Nature: | Offshore |
| Departure airport: | S. Timbalier 151 Offshore Platform, Gulf of Mexico, off coast of Texas |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE AIRCRAFT EXPERIENCED AN ENGINE FAILURE DURING A SLING LOAD PICK UP ON AN OFFSHORE PLATFORM. DURING THE AUTO ROTATION, THE LEFT SKID AND FLOAT STRUCK A HANDRAIL ON THE RIG AND SEPARATED. THE AIRCRAFT IMPACTED THE WATER, NOSE LOW, AND ROLLED OVER AS A RESULT OF THE SEPARATED FLOAT.
INVESTIGATION REVEALED THAT THE ENGINE FAILURE WAS A RESULT OF A 6TH STAGE COMPRESSOR WHEEL FATIGUE FAILURE. THE WHEEL FATIGUE ORIGINATED AT A CASTING INCLUSION THAT HAD NOT BEEN DETECTED DURING THE MANUFACTURING PROCESS.
The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
A COLLISION BETWEEN THE AIRCRAFT AND THE PLATFORM DURING THE EMERGENCY AUTO-ROTATION WHICH CAUSED THE LEFT SKID AND FLOAT TO SEPARATE AND DESTABILIZED THE AUTO-ROTATION. THE COLLISION WAS PROBABLY UNAVOIDABLE DUE TO THE MANOEUVRE THAT WAS BEING CONDUCTED AT THE ONSET OF THE EMERGENCY.
THE EMERGENCY LANDING WAS ATTEMPTED FOLLOWING AN ENGINE FAILURE THAT WAS THE RESULT OF A TOTAL COMPRESSOR FAILURE. THE COMPRESSOR FAILURE WAS CAUSED BY A FATIGUE FAILURE OF THE SIXTH STAGE WHEEL WHICH SEPARATED. THE FAILURE WAS INITIATED DUE TO A CASTING INCLUSION IN THE WHEEL WHICH WAS NOT DETECTED DURING THE MANUFACTURING PROCESS.
Sources:
1. NTSB Identification: FTW89LA036 at https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001213X27585&key=1&queryId=8f00a6e0-20cb-4a4b-a09d-b74b9177cb7a&pgno=1&pgsize=50
2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=22704
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 16-Apr-2016 18:31 | Dr.John Smith | Updated [Operator, Location, Country, Nature, Departure airport, Source, Narrative] |
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
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