What was found
DURING ROUTINE INSPECTION, THE LT OB THRUST REVERSER STANG FOUND DISPLACED .2500 INCH OB FROM NORMAL POSITION. REMOVAL OF STANG REVEALED THE LOWER FWD SUPPORT WAS MISSING THE UPPER FWD SUPPORT SHEARED OFF. THE ATTACHING RIVETS HAD FAILED. FURTHER INSPECTION REVEALED THE UPPER AFT MOUNTING LUG OF OB (BIRDCAGE) WAS CRACKED DUE TO STRESSES IMPOSED DUE TO MISSING FWD SUPPORT. THRUST REVERSER WAS REMOVED AND SENT TO MFG FOR REPAIR. AS PREVENTIVE MEASURE, THE RT OB THRUST REVERSER STANG WAS REMOVED AND THE LOWER FWD SUPPORT WAS FOUND LOOSE WITH ONE SHEARED ATTACHING RIVET. THE UNIT WAS REMOVED FOR REPAIR. CAUSE MAY HAVE BEEN ACCUMULATED AGE AND VIBRATION. (K)