What was found
PILOT REPORTED LANDING GEAR WOULD NOT STAY RETRACTED. THE GEAR WOULD (SLAM) WHEN UP. THE LANDING GEAR EXTENDED PROPERLY AND AN UNEVENTFUL LANDING WAS MADE. MAINTENANCE PERSONNEL JACKED UP THE AIR CRAFT AND DUPLICATED THE PROBLEM, INSPECTION REVEALED THE RT MAIN GEAR UPLOCK HOOK WAS BROKEN, ALLOWING THE UPLOCK SWITCH TO CLOSE WHICH CAUSED THE (SLAMMING). THE PART WAS REPLACED AND THE PROBLEM WAS FIXED, SUSPECT HIGH TIME CAUSED THE BREAK. THE NEW PART WAS MADE OF STEEL. THE OLD PART MADE OF ALUMINUM. (GL11200413886)