N118NC

ATA 2150

Part: O-RING — DAMAGED (A/C BAY) · airframe 10,053 hrs · 32,697 cycles

DURING DESCENT TO LAND CREW SMELT (STRANGE ODOR) COMING FROM THE AIR CONDITIONING GASPERS. DEACTIVATING ENVIRONMENT CONTROL UNIT CEASED ODOR. AFTER LANDING INSPECTION MAINTENANCE PERSONNEL DISCOVERED A SPLIT IN THE (INDUCTOR) TUBE BETWEEN THE TEMPERATURE CONTROL UNIT AND THE COOLING TURBINE OF THE ECU. SEALING O-RING (PACKING) OF INDUCTOR AT COOLING TURBINE END HAD DETERIORATED AND STARTED TO COME OUT OF TUBE AT SPLIT.

ATA 2150

Part: O-RING — BLOWN (A/C BAY) · airframe 10,053 hrs · 32,697 cycles

CRUISE FLIGHT, CLOSE TO FLIGHT DESTINATION, CREW SMELLED "STRANGE ODOR" IN CABIN/COCKPIT. PILOT TURNED OFF THE ENVIRONMENTAL CONTROL UNIT AND SMELL CEASED. INSPECTION OF ECU REVEALED THAT THE "INDUCTOR" PIPE TEMPERATURE CONTROLLER TO COOLING TURBINE HAD A SMALL SPLIT AT THE TURBINE AND PIECES OF THE SEALING O-RING (PACKING) WAS EXPOSED AND MISSING.

ATA 2150

Part: ECS — MALFUNCTIONED (A/C BAY)

AIRCRAFT WAS ALMOST AT DESTINATION WHEN THE CREW SMELLED SEVERAL STRANGE ODORS. CREW THOUGHT THE SMELLS WERE COMING FROM NUMEROUS FIRES ON THE GROUND IN THE AREA. NURSE IN BACK OF AIRCRAFT REPORTED SMOKE COMING FROM THE ENVIRONMENTAL SYSTEM VENTS IN THE AIRCRAFT CABIN. PILOT AND MEDICAL CREW MEMBER IN FRONT NEVER SAW SMOKE. THE ECU WAS BLOWING WARM AIR EVEN THOUGH IT WAS SET FOR AIR CONDITIONING. TURNING OFF THE ECU STOPPED BOTH THE SMOKE AND THE SMELL. THE CLOSEST PLACE TO LAND WAS THE DESTINATION, AND LANDING WAS COMPLETED WITHOUT INCIDENT. MECHANIC FOUND FAILED COMPONENTS IN THE AIR CONDITIONING SYSTEM. MECHANIC TOOK ECU OUT OF SERVICE, COMPLETED MEL PAPERWORK, AND PLACARDED SYSTEM OUT OF SERVICE AS WELL.

ATA 2150

Part: O-RING — DAMAGED (A/C BAY) · airframe 10,053 hrs · 32,697 cycles

CRUISE FLIGHT, CLOSE TO FLIGHT DESTINATION CREW SMELLED "STRANGE ODOR" IN CABIN/COCKPIT. PILOT TURNED OFF THE ENVIRONMENTAL CONTROL UNIT AND SMELL CEASED. INSPECTION OF ECU REVEALED THAT THE "INDUCTOR" PIPE TEMPERATURE CONTROLLER TO COOLING TURBINE HAD A SMALL SPLIT AT THE TURBINE AND PIECES OF THE SEALING O-RING (PACKING) WAS EXPOSED AND MISSING.

ATA 2150

Part: O-RING — DAMAGED (A/C BAY) · airframe 10,053 hrs · 32,697 cycles

CRUISE FLIGHT, CLOSE TO FLIGHT DESTINATION, CREW SMELLED "STRANGE ODOR" IN CABIN/COCKPIT. PILOT TURNED OFF THE ENVIRONMENTAL CONTROL UNIT AND SMELL CEASED. INSPECTION OF ECU REVEALED THAT THE "INDUCTOR" PIPE TEMPERATURE CONTROLLER TO COOLING TURBINE HAD A SMALL SPLIT AT THE TURBINE AND PIECES OF THE SEALING O-RING (PACKING) WAS EXPOSED AND MISSING.

ATA 2150

Part: O-RING — DAMAGED (A/C BAY) · airframe 10,053 hrs · 32,697 cycles

CRUISE FLIGHT, CLOSE TO FLIGHT DESTINATION, CREW SMELLED "STRANGE ODOR" IN CABIN/COCKPIT. PILOT TURNED OFF THE ENVIRONMENTAL CONTROL UNIT AND SMELL CEASED. INSPECTION OF ECU REVEALED THAT THE "INDUCTOR" PIPE TEMPERATURE CONTROLLER TO COOLING TURBINE HAD A SMALL SPLIT AT THE TURBINE AND PIECES OF THE SEALING O-RING (PACKING) WAS EXPOSED AND MISSING.

ATA 2150

Part: O-RING — DAMAGED (A/C BAY) · airframe 10,053 hrs · 32,697 cycles

CRUISE FLIGHT, CLOSE TO FLIGHT DESTINATION, CREW SMELLED "STRANGE ODOR" IN CABIN/COCKPIT. PILOT TURNED OFF THE ENVIRONMENTAL CONTROL UNIT AND SMELL CEASED. INSPECTION OF ECU REVEALED THAT THE "INDUCTOR" PIPE TEMPERATURE CONTROLLER TO COOLING TURBINE HAD A SMALL SPLIT AT THE TURBINE AND PIECES OF THE SEALING O-RING (PACKING) WAS EXPOSED AND MISSING.

ATA 2150

Part: O-RING — DAMAGED (A/C BAY) · airframe 10,053 hrs · 32,697 cycles

CRUISE FLIGHT, CLOSE TO FLIGHT DESTINATION, CREW SMELT "STRANGE ODOR" IN CABIN/COCKPIT. PILOT TURNED OFF THE ENVIRONMENTAL CONTROL UNIT (ECU) AND SMELL CEASED. INSPECTION OF ECU REVEALED THAT THE "INDUCTOR" PIPE TEMPERATURE CONTROLLER TO COOLING TURBINE HAD A SMALL SPLIT AT THE TURBINE AND PIECES OF THE SEALING O-RING (PACKING) WAS EXPOSED AND MISSING.

ATA 2150

Part: O-RING — DAMAGED (A/C BAY) · airframe 10,053 hrs · 32,697 cycles

CRUISE FLIGHT, CLOSE TO FLIGHT DESTINATION, CREW SMELLED "STRANGE ODOR" IN CABIN/COCKPIT. PILOT TURNED OFF THE ENVIRONMENTAL CONTROL UNIT AND SMELL CEASED. INSPECTION OF ECU REVEALED THAT THE "INDUCTOR" PIPE TEMPERATURE CONTROLLER TO COOLING TURBINE HAD A SMALL SPLIT AT THE TURBINE AND PIECES OF THE SEALING O-RING (PACKING) WAS EXPOSED AND MISSING.

ATA 2150

Part: O-RING — BLOWN (A/C BAY) · airframe 10,053 hrs · 32,697 cycles

CRUISE FLIGHT, CLOSE TO FLIGHT DESTINATION, CREW SMELLED "STRANGE ODOR" IN CABIN/COCKPIT. PILOT TURNED OFF THE ENVIRONMENTAL CONTROL UNIT AND SMELL CEASED. INSPECTION OF ECU REVEALED THAT THE "INDUCTOR" PIPE TEMPERATURE CONTROLLER TO COOLING TURBINE HAD A SMALL SPLIT AT THE TURBINE AND PIECES OF THE SEALING O-RING (PACKING) WAS EXPOSED AND MISSING.