What was found
DURING TAKEOFF, CREW COMPLAINED OF BURNT RUBBER OR PLASTIC SMELL IN THE CABIN. AIR CONDITIONER WAS TURNED ON AND UPON THE SMELL OF THE RUBBER THE A/C WAS TURNED OFF AND SMELL EVENTUALLY WENT AWAY AFTER THE CREW ABORTED THE FLIGHT, AND OPENED WINDOWS TO VENT AIRCRAFT. MAINTENANCE PERFORMED AS FOLLOWS: INSPECTED VENTING SYSTEM IN CABIN AND FOUND NO BURNT MOTORS OR VENTS. WENT INTO ENGINE BAY, BELT WAS INSPECTED AND DEEMED SERVICEABLE BUT TENSION WAS INCORRECT. BELT TENSION WAS RESET WITH IN LIMITS, AND COMPRESSOR WAS RE-TORQUED AND SAFETIED AS REQUIRED. RAN AIRCRAFT FOR 20 MINS AND SMELL WAS GONE.