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ASN Wikibase Occurrence # 132627
Last updated: 29 May 2017
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Date:01-APR-1990
Time:13:55
Type:Silhouette image of generic AS50 model; specific model in this crash may look slightly different
Aérospatiale AS 350B
Owner/operator:Macaw Helicopters
Registration: N350AP
C/n / msn: 1252
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Airplane damage: Written off (damaged beyond repair)
Category:Accident
Location:Philippine Sea, off Saipan -   Northern Mariana Islands
Phase: En route
Nature:Private
Departure airport:Koblerville, Saipan, Northern Mariana Islands
Destination airport:Anatahan Island, Northern Mariana Islands
Investigating agency: National Transport Safety Bureau (NTSB) - United States of America
Narrative:
THE PILOT AND PAX WERE CRUISING OVER THE PHILIPPINE SEA WHEN THE PILOT FELT AN EXTREME VIBRATION. THE PILOT MADE AN EMERGENCY LANDING IN THE 7-FT SEA. THE PILOT REPORTED THAT PRIOR TO THE HELICOPTER OVERTURNING HE OBSERVED THAT 'ONE OF THE ELASTOMERIC SPHERICAL THRUST BEARINGS WAS COMPLETELY GONE.' THE HELICOPTER SUBSEQUENTLY OVERTURNED, SANK AND HAS NOT BEEN RECOVERED. THE ACFT'S ROTOR SYSTEM HAD PREVIOUSLY BEEN INVOLVED IN A SUDDEN STOPPAGE MISHAP AND HAD THEREAFTER BEEN REPAIRED AND RETURNED TO SERVICE BY OTHER THAN THE CURRENT COMPANY MAINTENANCE PERSONNEL.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

THE PARTIAL FAILURE OF A ROTOR SYSTEM COMPONENT FOR UNDETERMINED REASONS.

Sources:

1. http://www.ntsb.gov/aviationquery/brief.aspx?ev_id=20001212X22940&key=1
2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=350AP
3. http://www.griffin-helicopters.co.uk/accidentdetails.aspx?accidentkey=11552


Revision history:

Date/timeContributorUpdates
24-Jun-2014 17:36 Dr. John Smith Updated [Time, Location, Country, Nature, Departure airport, Destination airport, Source, Narrative]
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]

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