What was found
DURING CRUISE FLIGHT AT 120 KTS, THE LT SLIDING CABIN DOOR CAME OPEN, SLID ALL THE WAY TO THE STOP AT A HIGH RATE OF SPEED AND POPPED OUT OF THE CENTER GUIDE RAIL. THE MECHANICS FOUND A BOLT VERY LOOSE (3 OR 4 TURNS LOOSE) IN THE LATCHING MECHANISM FRICTION SYS, WHICH ALLOWED THE DOOR HANDLE TO VIBRATE OPEN. THE CENTER GUIDE ARM ABOVE WAS BENT, THE CENTER GUIDE RAIL P/N B520M0037801 WAS BENT OPEN WHERE THE GUIDE POPPED OUT AND THE BACKSTOP P/N B520M4025102 WAS CRACKED. THE DAMAGED PARTS WERE REPLACED, THE LOOSE BOLT WAS REMOVED, CLEANED AND REINSTALLED TO PROPER TORQUE WITH THREAD LOCKING FLUID. NO FURTHER PROBLEMS HAVE OCCURED.