What was found
AIRCRAFT RETURNED OF FLIGHT AS A CONSEQUENCE OF STRONG VIBRATION IN THE NOSE LANDING GEAR. AIRCRAFT WAS SENT TO THE HANGAR AND DURING MAINTENANCE REVISION, IT WAS DETECTED THAT THE NOSE LANDING GEAR DOOR DID NOT RISE. THE NOSE LANDING GEAR DOOR LINKS WERE REPLACED IAW MM 32-22-01 AND NOSE LANDING GEAR DOOR TRIM WAS PERFORMED IAW MM 32-22-01, TESTED CORRECT. THE OVERWEIGHT LANDING INSPECTION WAS PERFORMED IAW MM 05-50-00. DURING OVERNIGHT CHECK, THE NOSE LANDING GEAR WAS TESTED IAW MM 32-22-00, BEING CORRECT.