What was found
DURING A ROUTINE INSPECTION, THE LEFT LANDING GEAR RETRACT LINKAGE HAD EXCESSIVE PLAY. INVESTIGATION REVEALED THE LEFT MAIN GEAR TORQUE TUBE FORK BOLT HOLE WAS SEVERELY ELONGATED. FORK BOLT IS COVERED UNDER AD 76-13-07 WHICH REQUIRES REPLACEMENT AT 5,000 HOUR INTERVALS. THIS PART HAD BEEN REPLACED 1,650 HOURS PREVIOUSLY. SUSPECT ATTACH HOLE DRILLED OVERSIZE DURING MANUFACTURE. IMPROPER HEAT TREATMENT. SUBMITTER SUGGESTS MORE FREQUENT REPLACEMENT AND INSPECTION INTERVALS.