NTSB Identification: FTW85LA233.
The docket is stored on NTSB microfiche number 30395.
Accident occurred Friday, May 24, 1985 in HAMILTON, TX
Aircraft: MOONEY M20, registration: N853B
Injuries: 1 Serious.

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 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.

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

PROPELLER SYSTEM/ACCESSORIES..VIBRATION

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

LUBRICATING SYSTEM,OIL SEAL..UNDERTORQUED

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

FLUID,OIL..LOSS,PARTIAL

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

LUBRICATING SYSTEM,OIL GASKET..UNDERTORQUED

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