What was found
ON APPROACH TO LANDING. MOMENTS AFTER LANDING GEAR WAS PUT DOWN THE ENTIRE CABIN SMELLED A BURNING SMELL. COULD SMELL EVERYWHERE FROM THE FLIGHT DECK TO THE REAR OF THE CABIN. MANY PASSENGERS COMPLAINED OF BURNING SMELL. CAN NOT PINPOINT WHERE IT CAME FROM.T/S USING FIM 21-20-00 AND FIM 21-22-00AND BOMBARDIER SERVICE LETTER 21-028. ALL CABIN LIGHTS ARE OPERATIONAL. RAN BOTH PACKS OFF OF BOTH ENGINE BLEED SOURCES AND APU. RECIRC FANS ARE OPERATIONAL. NO DEFECTS NOTED AT THIS TIME.