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ASN Wikibase Occurrence # 58774
Last updated: 14 November 2021
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Type:Silhouette image of generic MD60 model; specific model in this crash may look slightly different
McDonnell Douglas MD 600N
Owner/operator:United States Customs and Border Protection
Registration: N608BP
MSN: RN037
Fatalities:Fatalities: 0 / Occupants: 3
Aircraft damage: Substantial
Location:San Clemente, CA -   United States of America
Phase: En route
Departure airport:Long Beach, CA (LGB)
Destination airport:San Diego, CA (SDM)
Investigating agency: NTSB
During cruise flight the helicopter experienced a loss of engine power. The pilot performed an autorotation, maneuvering the helicopter to avoid obstacles. The helicopter sustained substantial damage after landing hard, semi-submerged in the surf zone of a beach. During the landing sequence, a main rotor blade made contact with the tail boom and the helicopter sustained crush damage to the lower fuselage. Post accident examination of the airframe did not reveal evidence of any failure or malfunction. Examination of the engine revealed a failure of the number two bearing, resulting in a subsequent failure of the engine’s gas generator and power turbine sections. Examination of the bearing revealed signatures consistent with the inner and outer bearing races experiencing misalignment. The misalignment resulted in the associated balls becoming mechanically locked against the ball cage, leading to raceway compromise, heat damage, and bearing failure. As a result of this accident, and other in-service wear issues related to the number two bearing, the engine manufacturer has embarked on a bearing redesign process for this engine series.
Probable Cause: Failure of the engine’s number two bearing during cruise flight, which resulted in a loss of engine power.



Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 2 months
Download report: Final report

Revision history:

20-Feb-2009 22:35 4evergrounded Added
29-Dec-2010 06:05 TB Updated [Aircraft type, Cn, Operator, Location, Nature, Departure airport, Destination airport, Source, Damage]
27-Feb-2013 09:02 TB Updated [Time, Aircraft type, Source, Damage]
27-Feb-2013 11:20 TB Updated [Operator]
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
01-Dec-2017 12:10 ASN Update Bot Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative]

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