HAMILTON, TX, USA
N853B
MOONEY M20
THE PLT STATED THE ACFT AND ENGINE ASSY HAD EXPERIENCED EXECSSIVE VIBRATIONS WHILE IN FLT FOLLOWED BY THE WINDSHIELD BEING COVERED WITH OIL IMMEDIATELY AFTER THE VIBRATION STARTED. THE PROPELLER ASSY HAD BECOME LOOSE FROM THE ENGINE MOUNT AND SEPARATED AT IMPACT. ONLY ONE BOLT REMAINED ATTACHED AT IMPACT. METALLURGICAL EXAM INDICATED A LACK OF TORQUE WHICH ALLOWED VIBRATORY AND OTHER HIGH CYCLE STRESS TO BE FELT BY THE BOLTS THEREBY INITIATING AND PROPAGATING FATIQUE CRACKS.
Source: NTSB Aviation Accident Database
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