As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FIBERGLASS WINGTIP FUEL TANK STC SA1480WE HAS AN EDGE DISTANCE OF .2500 INCH SCREW HOLES WHICH BROKE FIBERGLASS OUT CAUSING THE WINGTIP TO FALL OFF, WHILE AIRCRAFT WAS ON GROUND. FIBERGLASS TIP DOES NOT HAVE SUFFICIENT STRENGTH DUE TO FIBERGLASS THICKNESS AND EDGE DISTANCE.