NTSB Identification: ATL86FLQ06.
The docket is stored on NTSB microfiche number 31441.
Accident occurred Monday, August 04, 1986 in TRENTON, KY
Aircraft: BERNARD SONERAI II, registration: N325WB
Injuries: 1 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

WITNESSES REPORTED SEEING THE ACFT SPIN TO GROUND IMPACT WITH A SECTION OF THE RIGHT WING HANGING. POST ACCIDENT EXAM REVEALED THE OUTBOARD HALF (APRX 4 FT) OF THE RIGHT WING WAS BENT APRX 120 DEGREES TO THE INSIDE HALF OF THE RIGHT WING. MONNETT EXPERIMENTAL AIRCRAFT SERVICE BULLETIN NO. 002 ADDRESSED FLIGHT ENVELOPE RESTIRCTION NECESSARY TO PREVENT INFLIGHT WING FAILURES DUE TO OVERLOADS. IT IS NOT KNOWN IF THESE RESTRICTIONS WERE ADHEARED TO. THE PREVIOUS ACFT OWNER HAD INSTALLED A 14 INCH EXTENSION ON THE WINGS PRIOR TO THIS SERVICE BULLETIN. THE EFFECT ON THE STRUCTURAL INTEGRITY BY THE ADDITION OF THE EXTENSIONS IN UNKNOWN.

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

WING..UNDETERMINED

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