NTSB Identification: ATL88IA074.
The docket is stored on NTSB microfiche number 35936.
Incident occurred Monday, October 05, 1987 in COLUMBIA, SC
Probable Cause Approval Date: 07/10/1989
Aircraft: MOONEY M-20E, registration: N1936Y
Injuries: 2 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.

DURING TAKEOFF THE PROPELLER STUDS FAILED AND THE PROPELLER DEPARTED THE ACFT. FAA INCIDENT RPT STATED THAT PROPELLER HAD BEEN OVERHAULED AND REPLACED 32 HOURS PRIOR TO THE SEPARATION. METALLURGICAL EXAM OF THE PROPELLER STUDS REVEALED FATIGUE FAILURE OF THE STUDS THROUGH THE THREADED AREA WITH NO DAMAGE TO THE THREADS. FATIGUE FAILURE OF PROP STUDS OCCURRED AS A RESULT OF VIBRATION DUE TO INADEQUATE TORQUING OF THE MOUNTING NUTS.

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

PROPELLER SYSTEM/ACCESSORIES..SEPARATION

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

MAINTENANCE,INSTALLATION..IMPROPER..OTHER MAINTENANCE PERSONNEL

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