What was found
ON SHORT FINAL, THE FLIGHT CREW REPORTED SMELLING SMOKE IN THE COCKPIT. WITHIN A COUPLE SECONDS OF SMELLING IT, THE CREW SAW A SHORT PUFF OF SMOKE COME OUT FROM THE AREA OF THE PILOT AND CO-PILOT SIDE VENTS. THE AIRCRAFT MADE AN UN-EVENTFUL LANDING. MAINTENANCE INSPECTED THE AIRPLANE. FOUND THAT THE AIR CYCLE MACHINE HAD FAILED. THE ACM WAS REPLACED, OPERATION CHECKS COMPLETED AND THE AIRCRAFT RETURNED TO SERVICE WITH NO FURTHER ISSUES.