TEEC NOS POS, AZ, USA
N1089S
HUGHES 369D
THE ACFT LOST ENG POWER & CRASHED WHILE ATTEMPTING AN AUTOROTATION. ENG TEARDOWN REVEALED THAT THE #2 BEARING FAILED AS A RESULT OF SOME OF THE BALL RETAINERS BEING BROKEN & CRACKED BETWEEN THE BALL POCKETS. THIS CONDITION ALLOWED THE IMPELLER ASSEMBLY TO MOVE FORWARD CONTACTING THE DIFFUSER ASSEMBLY RESULTING IN A LOSS OF ENG OPERATING POWER.
Source: NTSB Aviation Accident Database
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