ASN Wikibase Occurrence # 36015
Last updated: 23 April 2017
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Narrative:Ground witnesses reported seeing the helicopter disintegrate in-flight, about 250 feet above ground level. The helicopter impacted the ground in a nearly inverted attitude, scattering rotor blade fragments on both sides of a canal. The ex-military, medium lift helicopter with twin intermeshing rotors was en route to perform an off-airport lift operation. It operated in the 'restricted' category and was required to fly over unpopulated areas. At the time of the accident, it was flying parallel with a canal. Examination of the wreckage revealed that the fixed horizontal stabilizer left outboard leading edge attach fitting had fractured and exhibited evidence of a pre-existing crack. A second attach fitting aft of the leading edge attachment was also fractured. Additionally, the operator had installed automotive dampers in lead-lag positions on the rotor blades. CAUSE: Failure of the horizontal stabilizer left outboard forward attach point because of a previously existing crack that resulted from inadequate maintenance inspection by the operator. A factor was the use of automotive parts.
|C/n / msn:|| 59-1583|
|Fatalities:||Fatalities: 2 / Occupants: 2|
|Airplane damage:|| Written off (damaged beyond repair)|
|Location:||Phoenix, AZ -
United States of America
|Phase:|| En route|
|Departure airport:||Litchfield Park, AZ|
|Destination airport:||, AZ (NONE)|
|Investigating agency: ||National Transport Safety Bureau (NTSB) - United States of America |
||ASN Update Bot
||Updated [Time, Damage, Category, Investigating agency]|