What was found
LEFT MAIN FUEL TANK (TIP TANK) AFT BULKHEAD (PN: 0823400-109) CRACKED IN UPPER RADIUS. THIS BULK HEAD IS AN EXTENSION OF THE AFT WING SPARE AND IS ONE OF ONLY 2 LOCATIONS THAT HOLD THE FUEL TANK ON THE AIRPLANE. WE HAVE JUST PURCHASED THE AIRPLANE AND ONLY FLEW IT ONCE TO GET IT BACK TO OUR SHOP WERE WE DISCOVERED THE CRACK UPON INSPECTION. THIS IS THE 2ND 340A WHERE I HAVE SEEN THIS FAILURE, THE OTHER ONE WAS THE SAME BULKHEAD, SAME RADIUS BUT ON THE RIGHT TANK.