NTSB Identification: LAX91LA300.
The docket is stored on NTSB microfiche number 44876.
Accident occurred Monday, July 08, 1991 in RENO, NV
Probable Cause Approval Date: 03/31/1993
Aircraft: CESSNA 320, registration: N3011T
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE PILOT STATED THAT HE APPLIED FULL POWER AND THE AIRCRAFT WAS ACCELERATING THROUGH 30 KNOTS ON THE TAKEOFF GROUND ROLL WHEN HE HEARD A LOUD EXPLOSION. THE PILOT ABORTED THE TAKEOFF AND TAXIED BACK TO THE RAMP. INSPECTION OF THE AIRCRAFT REVEALED THAT A CLAMP WHICH RETAINS ONE OF THE FEATHERING COUNTER WEIGHTS ON THE LEFT PROPELLER HAD SEPARATED, AND THE COUNTER WEIGHT PENETRATED THROUGH THE NOSE STRUCTURE OF THE AIRCRAFT. THE FAILED CLAMP ASSEMBLY WAS SENT TO THE FACTORY UNDER THE SUPERVISION OF THE FAA CHICAGO AIRCRAFT CERTIFICATION OFFICE FOR DETAILED ANALYSIS. ACCORDING TO THE REPORT OF THE EXAMINATION, THE FRACTURE WAS FOUND TO BE OF A FATIGUE TYPE, WITH THE ORIGIN ON THE LOWER INSIDE CORNER OF THE STEEL STRAP. CHEMICAL AND HARDNESS TESTS OF THE ASSEMBLY REVEALED THAT THE PART MET SPECIFICATIONS. THE REASON FOR THE FRACTURE INITIATION WAS UNDETERMINED.

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

THE FATIGUE FAILURE OF THE PROPELLER FEATHERING COUNTER WEIGHT CLAMP ASSEMBLY.

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