NTSB Identification: CHI92FA223.
The docket is stored on NTSB microfiche number 50017.
Accident occurred Monday, August 03, 1992 in OSHKOSH, WI
Probable Cause Approval Date: 10/15/1993
Aircraft: EDRA/MCDERMITT SEABIRD/PETREL, registration: N109SB
Injuries: 2 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.

THE BRAZILIAN MANUFACTURED AMPHIBIAN HOMEBUILT KIT AIRPLANE HAD NOT MADE ANY WATER LANDINGS OR TAKEOFFS PRIOR TO ITS ARRIVAL AT THE EAA FLY-IN. IT HAD BEEN PARKED IN A COVE ADJACENT TO A LAKE. SOMETIME DURING THE EVENING AND/OR EARLY MORNING THE FOLLOWING DAY, THE AIRPLANE BECAME PARTIALLY SUBMERGED WHILE MOORED DUE TO ROUGH WEATHER AND WATER. IT WAS BROUGHT CLOSE TO SHORE AND THE WATER REMOVED. PRIOR TO THE FLIGHT WITNESSES OBSERVED THE PILOT AND AN ASSOCIATE PULLING THE AIRPLANE ONTO SHORE BY THE TAILBOOM. DURING THE SECOND DAY OF FLYING, THE EMPENNAGE AND TAILBOOM ASSEMBLY SEPARATED FROM THE FUSELAGE/HULL DURING A DESCENT. POST-CRASH EXAMINATION REVEALED THAT THE TAILBOOM WAS CONSTRUCTED WITH ONLY FOUR OF THE SIX REQUIRED CARBON FIBER LAMINATE PLIES. IN ADDITION, THE STRIPS UTILIZED TO HOLD THE TAILBOOM TOGETHER WERE ALSO MINUS ONE CARBON FIBER LAMINATE PLY. THE TAILBOOM CAME ASSEMBLED FROM THE KIT MANUFACTURER IN BRAZIL.

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

INADEQUATE QUALITY CONTROL DURING THE MANUFACTURING PROCESS RESULTING IN THE IN-FLIGHT STRUCTURAL FAILURE OF THE TAILBOOM.

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