What was found
OWNER REPORTED FLAP SPLIT DURING FLIGHT. INSPECTION REVEALED LT FLAP FLEX CABLE DRIVE SPLINE CRIMP TO BE LOOSE WHICH ALLOWED CABLE CORE TO SLIP. LT FLAP DID NOT EXTEND AS MUCH AS RT FLAP. WHEN FLAPS WERE RETRACTED, LT FLAP CONTACTED UPLIMIT SWITCH; THUS, STOPPING FLAP RETRACTION. RT FLAP WAS STILL EXTENDED 15 DEGREES - 25 DEGREES CAUSING SPLIT. THIS APPEARED TO BE A MANUFACTURING DEFECT. SUBMITTER SUGGESTED RAYTHEON ISSUE AN EMERGENCY SB TO REQUIRE FIELD INSPECTIONS OF FLAP DRIVE SYSTEM. (X)