# Incident 20121115025319I: Aerospatiale/Aeritalia ATR 42-320, Misoula, MT, November 15, 2012

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: November 15, 2012, 18:54 local time
- Place: Misoula, MT
- Airport: Missoula Int. Airport
- Damage: Minor damage
- Phase of flight: Takeoff: Climb Out
- Operating rules: Air carrier (Part 121)
- Operator: COEA
- Aircraft: N900FX, a cancelled registration (https://openairdocs.org/deregistered/N900FX-2024-08-16) (OpenAirDocs)
- Registry model: Aerospatiale/Aeritalia ATR 42-320 (registry code 8680930, https://openairdocs.org/model/aerospatiale-aeritalia-atr-42-320) (OpenAirDocs)
- Registry engine: Pratt & Whitney Canada PW121 (registry code 52124, https://openairdocs.org/engine/pratt-whitney-canada-pw121) (OpenAirDocs)
- Reported make and model: AEROSPATIALE/AERITALIA ATR 42-320
- Reported engine: P&W CANADA PW121
- People aboard: 2
- Fatal injuries: 0
- Other injuries: 0
- Pilot certificates: Airline transport, commercial pilot, flight instructor
- Pilot flight hours: 3,513 total, 983 in this make and model, 55 in the last 90 days
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20121115025319I

## Narrative

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

ENROUTE MSO TO GTF AT 13,500 FEET:FLIGHT 7820:PILOT ENCOUNTERED A SLIGHT YAW TO THE LEFT AND A MOMENTARY TORQUE DECREASE OF 5% ON THE #1 ENGINE. PILOT THEN SMELLED SMOKE. ALL ENGINES READINGS WERE NORMAL EXCEPT THE ITT ON THE #1 ENGINE WHICH HAD INCRESED TO 780 DEGREES.SOON AFTER, PILOTS RECEIVED AN ENGINE FIRE INDICATION ON NUMBER 1 ENGINE. NUMBER ONE ENGINE WAS THEN SHUT DOWN; SMOKE BEGAN TO SUBSIDE.PILOTS THEN DECLARED AN EMERGENCY AND RETURNED TO MSO WITHOUT FURTHER INCIDENT.ON 11/19/2012, THE AIRLINE REPORTED THAT IT APPEARS THAT THE VENT LINE FOR THE #6 AND 7 BEARING CAVITIES HAD BROKEN AND ALLOWED HOT HIGH PRESSURE INTERNAL ENGINE GASES TO FLOW INTO THE ENGINE NACELLE. THE INTERNAL ENGINE COMPONENT THAT CAUSED THE VENT LNE TO BREAK IS UNKNOWN PENDING ENGINE TEARDOWN BY THE MANUFACTURER.

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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