# Incident 20240820011809I: Bombardier Inc CL-600-2B19, Denver, CO, August 20, 2024

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: August 20, 2024, 15:19 local time
- Place: Denver, CO
- Airport: Denver International
- Damage: No damage
- Phase of flight: Takeoff: Climb Out
- Operating rules: Air carrier (Part 121)
- Operator: SWIA
- Location: 39.8617° N, 104.6732° W: Placed by OpenAirDocs at DENVER INTL (DEN), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=39.8617&lon=-104.6732&mi=10
- Aircraft: N929SW, registered now (https://openairdocs.org/aircraft/N929SW) (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: 0
- Fatal injuries: 0
- Other injuries: 0
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20240820011809I

## Narrative

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

ON CLIMB OUT THE AIRCRAFT RECEIVED STAB TRIM, MACH TRIM, AND STALL FAIL CAUTION MESSAGES AT ABOUT 500’ AGL. THE PILOT CONTINUED TO CLIMB BUT COULD NOT ENGAGE STAB TRIM OR ADJUST IT FROM THE FAILED POSITION. IT TOOK A SIGNIFICANT AMOUNT OF NOSE DOWN PRESSURE TO MAINTAIN ALTITUDE AND THE AUTOPILOT WAS NOT AVAILABLE TO ASSIST. QUICK REFERENCE HANDBOOK (QRH) PROCEDURES DID NOT CORRECT THE ISSUE. THE CREW DECLARED AN EMERGENCY AND REQUESTED TO RETURN TO THE AIRPORT. WHILE THE FIRST OFFICER FLEW THE AIRCRAFT THE CAPTAIN WIGGLED THE STAB TRIM DISCONNECT SWITCH AND REGAINED TRIM CONTROL. THE AIRCRAFT LANDED AND RETURNED TO THE GATE WITHOUT FURTHER INCIDENT.

PRIOR TO THIS EVENT, ON 08/11/2024 THE AIRCRAFT RECEIVED MACH TRIM AND STAB TRIM CAUTION MESSAGES WHILE IN FLIGHT. THE MESSAGES WERE RE-SET BY THE PILOT UNDER DIRECTION OF MAINTENANCE CONTROL AND REMAINED CLEARED (REF.

ON 08/14/2024 DURING CLIMB OUT BOTH STAB TRIMS DISCONNECTED AND MACH TRIM DISCONNECTED AT THE SAME TIME. QRH PROCEDURES WERE RUN. BOTH SYSTEMS WERE RE-SET WITH NO FURTHER ISSUES FOR THAT FLIGHT. A RELIABILITY DISCREPANCY WAS INITIATED FOR THE NEXT MAINTENANCE OVERNIGHT VISIT FOR TROUBLESHOOTING OF REPEAT STAB TRIM/MACH TRIM CAUTION MESSAGES (REF.

ON 08/17/2024 MACH TRIM AND STAB TRIM CAUTION MESSAGES CAME ON IN CRUISE. QRH PROCEDURES RESOLVED THE ISSUE FOR THE REMAINDER OF THE FLIGHT. ON TAXI IN, AFTER ENGINE #1 WAS SHUTDOWN, BOTH MESSAGES REAPPEARED. REPEAT HISTORY WAS NOTED. THE ISSUE COULD NOT BE DUPLICATED BUT THE STAB/MACH TRIM PANEL WAS REPLACED.

ON 08/20/2024 IN RESPONSE TO THE DISCREPANCY MADE AFTER EMERGENCY LANDING, THE CAPTAIN’S STAB TRIM DISCONNECT SWITCH WAS REPLACED.

THE OVERNIGHT TROUBLESHOOTING VISIT DID NOT OCCUR UNTIL 08/22/2024, AFTER THE EMERGENCY LANDING ON 08/20/2024. TROUBLESHOOTING DETERMINED STAB TRIM SWITCH REPLACEMENT CORRECTED THE PROBLEM. FUNCTIONAL AND OPERATIONAL CHECKS SHOWED NO DEFECTS. MAINTENANCE CARRY OVER ITEM (MCI) WAS REMOVED AND THE AIRCRAFT RELEASED FOR SERVICE.

THERE HAVE BEEN NO FURTHER ISSUES RELATED TO THIS SYSTEM.

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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