What was found
WHILE ON VISUAL APPROACH CAVU DAY WE HAD THE SMELL OF SMOKE THROUGH THE AIRPLANE. WE COULD NOT IDENTIFY THE SOURCE. PERFORMED A BREAKAWAY TORQUE CHECK OF THE LEFT AND RIGHT ACM TURBINES IAW AMM PART II TASK 21-51-00-720-801. BREAKAWAY TORQUE WITHIN LIMITS AT THIS TIME. NO DEFECTS NOTED. REMOVED THE WATER SEPARATOR COALESCER BAGS, CHECKED BAGS FOR OIL IMPREGNATION, AND REINSTALLED IAW AMM PART II TASK 21-51-13-400-801. NO OIL WAS NOTED IN THE COALESCERS AT THIS TIME. REMOVED THE APU INLET DUCT AT THE CONNECTION POINT TO THE APU ENCLOSURE & CHECKED THE APU COMPRESSOR FOR OIL WITH A BORESCOPE, NOTED NO OIL PRESENT AT THIS TIME. REINSTALLED THE APU INLET DUCT IAW AMM PART II TASK 49-14-01-400-801. PER MCC'S REQUEST PERFORMED THE BOMBARDIER ECS BURN-OFF PROCEDURE. NO OIL SMELL WAS NOTED DURING THE BURN-OFF PROCEDURE. PER DOM REQUEST, TECHS OPERATED EACH INDIVIDUAL CABIN APPLIANCE AND CHECKED FOR SMOKE EMISSION, NO SMOKE EMISSIONS NOTED. MCC & DOM ELECT NO FURTHER ACTION AT THIS TIME. NO DEFECTS NOTED, ALL LEAK CHECKS SATISFACTORY.