NTSB Identification: MIA94LA171.
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Accident occurred Monday, July 04, 1994 in FORT LAUDERDALE, FL
Probable Cause Approval Date: 04/27/1995
Aircraft: PITTS S2B, registration: N61PS
Injuries: 1 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.

THE PILOT WAS PERFORMING ACROBATIC MANEUVERS WHEN HE HEARD A 'POP' AND NOTED THAT HIS RIGHT UPPER AILERON WAS LOOSE. HE SLOWED DOWN, AND WAS ABLE TO RETURN AND LAND WITHOUT FURTHER INCIDENT. POSTFLIGHT INSPECTION REVEALED A FAILURE OF THE UPPER RIGHT INBOARD AILERON WELDED BRACKET. FURTHER METALLURGICAL EXAMINATION AT THE SAFETY BOARD LABORATORY REVEALED 3 DISTINCT FATIGUE ORIGINS BETWEEN THE TOE OF THE WELD AND THE WELDED ZONES. THE WELD ITSELF EXHIBITED SHARP AND HIGH WELD CROWNS.

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

THE POOR WELDING QUALITY OF THE MANUFACTURER, RESULTING IN THE FATIGUE FAILURE OF THE AILERON ATTACHMENT BRACKET.

Full narrative available

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