What was found
DURING A LANDING, PILOT NOTICED THE LT FLAP DID NOT COME DOWN. AN INSPECTION REVEALED THE FLAP DRIVE ASSY WAS BROKEN BETWEEN THE STEEL SHAFT AND THE BELLCRANK. FURTHER INSPECTION REVEALED THE WELD BETWEEN THE TWO PARTS WAS DONE POORLY. THE WELD WAS ONLY ONE-QUARTER OF THE WAY AROUND THE SHAFT, AND, ALSO, IN AN ANGLE WHICH PUT THE DRIVE FLAP ASSY IN A POSITION WHICH COULD NOT HANDLE MUCH STRESS.