What was found
DURING AN INSPECTION OF THE AIRCRAFT, THE HINGE FOR THE ENTRY DOOR WAS LOOSE. THE HINGE WAS REMOVED AND INSPECTION REVEALED FRAME, P/N 50-430043-328, TO BE CRACKED AT 4 OF THE AFT RIVET HOLES. ALSO NOTED 3 RIVETS ATTACHING THE FRAME, P/N 50-430043-324, TO THE 2 CENTER FRAMES, WERE MISSING CAUSING FLANGES AT BOTTOM OF CENTER FRAMES TO BE CRACKED. REPAIRED BY INSTALLING INTERNAL AND EXTERNAL DOUBLERS.