NTSB Identification: CHI83IA209.
The docket is stored on NTSB microfiche number 23660.
Nonscheduled 14 CFR
Incident occurred Friday, May 06, 1983 in YOUNGSTOWN, OH
Aircraft: AERO COMMANDER 500B, registration: N6178X
Injuries: 1 Uninjured.

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

WHILE CRUISING AT 5000 FT MSL, THE PLT HEARD A 'VERY LOUD BANG' & NOTED 'VERY MUCH VIBRATION FROM THE LEFT ENG.' HE SHUT DOWN & FEATHERED THE LEFT ENG & PROP. WHEN THE ENG STOPPED TURNING, HE NOTED 1 PROP BLADE WAS MISSING. THE ACFT WAS LANDED WITHOUT FURTHER INCIDENT. AN EXAM REVEALED THAT A HARTZELL MODEL HC-A3VK-2 BLADE CLAMP, PN C-3, & A PILOT TUBE ON THE 3 BLADED PROP HAD FAILED FROM FATIGUE. ALSO, IT WAS NOTED THAT THE MOTOR MOUNTS BROKE LOOSE & THE GENERATOR BROKE LOOSE & SEPARATED. ULTIMATELY, THE GENERATOR FELL ON A PARKED AUTOMOBILE.

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

PROPELLER SYSTEM/ACCESSORIES,HUB..FATIGUE






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