# Incident 20211016016019I: Bombardier Inc CL-600-2B19, Chicago, IL, October 16, 2021

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: October 16, 2021, 19:50 local time
- Place: Chicago, IL
- Damage: No damage
- Phase of flight: Taxi
- Operating rules: Air carrier (Part 121)
- Operator: A6WA
- Location: 41.8500° N, 87.6501° W: Placed by OpenAirDocs: center of Chicago, IL, within about 9 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.8500&lon=-87.6501&mi=10
- Aircraft: N423AW, registered now (https://openairdocs.org/aircraft/N423AW) (OpenAirDocs)
- Registry model: Bombardier CL-600-2B19 (registry code 1390008, https://openairdocs.org/model/bombardier-cl-600-2b19) (OpenAirDocs)
- Registry engine: GE CF34 series (registry code 30015, https://openairdocs.org/engine/ge-cf34-series) (OpenAirDocs)
- Reported make and model: BOMBARDIER INC CL-600-2B19
- Reported engine: GE CF34 SERIES
- People aboard: 28
- Fatal injuries: 0
- Other injuries: 0
- Pilot certificates: Airline transport
- Pilot flight hours: 2,500 total
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20211016016019I

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

ON OCTOBER 16, 2021,^PRIVACY DATA OMITTED^, A MITSUBISHI (BOMBARDIER) CRJ200 (N423AW), TAXIED FOR DEPARTURE AT CHICAGO O'HARE INTERNATIONAL AIRPORT.  THE FLIGHT WAS SCHEDULED TO FLY TO GENERAL MITCHELL  MILWAUKEE INTERNATIONAL AIRPORT (KMKE).  THERE WERE 25 PASSENGERS ON BOARD, WITH 3 CREWMEMBERS.

DURING TAXI, THE FLIGHT CREW NOTICED AN UNUSUAL ODOR.  THEY CONFIRMED THE ODOR WAS PRESENT IN THE CABIN WITH THE FLIGHT ATTENDANT, AND DECIDED TO RETURN TO THE GATE.  THE GATE WAS OCCUPIED, AND WHILE THE AIRCRAFT WAS TAXIING TO THE "B" PAD, THE FLIGHT CREW RECEIVED NUMEROUS CAUTION MESSAGES REGARDING THE APU.  THE APU THEN SHUT DOWN AUTOMATICALLY.  WHILE PARKED IN THE "B PAD" WAITING FOR THEIR GATE TO OPEN, THE FLIGHT ATTENDANT NOTIFIED THE FLIGHT CREW THERE WAS SMOKE IN THE CABIN.

THE CAPTAIN INITIATED EVACUATION VIA THE PA SYSTEM.  THE MAIN CABIN DOOR AND SERVICE DOOR WERE UTILIZED FOR THE EVACUATION.

INVESTIGATION REVEALED AN APU OIL COOLER LINE O RING LEAKING.  THE AIR/OIL MIXTURE WAS FED INTO THE AC PACKS AND CAUSED THE HAZE/SMOKE

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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