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ASN Wikibase Occurrence # 132272
Last updated: 10 December 2016
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Date:03-JAN-1989
Time:1250
Type:Silhouette image of generic B06 model; specific model in this crash may look slightly different
Bell 206B-3 JetRanger III
Owner/operator:Petroleum Helicopters Inc
Registration: N22704
C/n / msn: 3614
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Airplane damage: Written off (damaged beyond repair)
Location:S. Timbalier 151 Offshore Platform, Gulf of Mexico, off coast of Texas -   United States of America
Phase: En route
Nature:Cargo
Departure airport:S. Timbalier 151 Offshore Platform, Gulf of Mexico, off coast of Texas
Destination airport:
Narrative:
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 http://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/timeContributorUpdates
16-Apr-2016 18:31 Dr.John Smith Updated [Operator, Location, Country, Nature, Departure airport, Source, Narrative]
Number of views: 767

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