NTSB Identification: NYC91LA250.
The docket is stored on NTSB microfiche number 45885.
Nonscheduled 14 CFR operation of AIR 500 LIMITED
Accident occurred Friday, September 27, 1991 in UTICA, NY
Probable Cause Approval Date: 05/03/1993
Aircraft: MITSUBISHI MU-2B-60, registration: CFFSS
Injuries: 2 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.

DURING CLIMB, ONE OF THE FOUR PROPELLER BLADES ON THE NUMBER TWO ENGINE SEPARATED FROM THE PROPELLER HUB, DAMAGING ANOTHER PROPELLER BLADE AND THE FUSELAGE. SHORTLY THEREAFTER, THE ENGINE SHUT DOWN. THE ROTATIONAL UNBALANCE WAS ACCOMPANIED BY EXTREME VIBRATION AND RESULTED IN DISTORTION AND DAMAGE TO THE ENGINE/COWL ASSEMBLY AND THE WING. THE UPPER PORTION OF THE ENGINE COWL WAS DEFLECTED UPWARD OVER THE WING AT AN ANGLE OF ABOUT 30 DEG, RESULTING IN DISTORTION OF AIRFLOW, BUFFETING, AND DEGRADATION OF ROLL CONTROL. DUE TO EXCESSIVE DRAG, MAXIMUM POWER WAS REQUIRED ON THE NUMBER ONE ENGINE IN ORDER TO CONTROL THE RATE OF DESCENT AND LAND SUCCESSFULLY. A METALLURGICAL EXAMINATION DISCLOSED EVIDENCE OF FATIGUE CRACKING OF THE PROPELLER HUB ARM.

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

FATIGUE CRACKING OF THE PROPELLER HUB.

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