What was found
DURING CRUISE PHASE OF FLIGHT, THE CREW REPORTED BURNING ODOR AND VIBRATION IN THE CABIN, DUE THAT SITUATION THE AIRCRAFT DIVERTED FOR MAINTENANCE. AFTER AN UNEVENTFUL LANDING THE PILOT REPORTED A HEAVY BURNING ODOR AND STRONG VIBRATION FELT ALONG THE CABIN. IT STOPPED WHEN THE BLOWER AND EXTRACT WERE TURNED OFF. MAINTENANCE PERSONNEL PERFORMED FAULT ANALYSIS TO THAT REPORT IAW TSM 05-50-00-810-831-A, AND 21-26-00-810-817-A, FOUND THAT THE CAUSE FOR THE BURNING ODOR AND VIBRATION ARE THE AVIONICS BLOWER FAN AND THE EXTRACT FAN. THOSE COMPONENTS WERE REPLACED IAW AMM 21-26-51 PB401, THE TESTS WERE SATISFACTORY, THE AIRCRAFT WAS RETURNED TO SERVICE.