# Incident 20121129029109I: Boeing 737-7H4, Denver, CO, November 29, 2012

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: November 29, 2012, 10:10 local time
- Place: Denver, CO
- Airport: Denver International
- Damage: No damage
- Phase of flight: Takeoff: Climb Out
- Operating rules: Air carrier (Part 121)
- Operator: SWAA
- 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: N294WN, registered now (https://openairdocs.org/aircraft/N294WN) (OpenAirDocs)
- Registry model: Boeing 737-7H4 (registry code 1384404, https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Registry engine: CFM International CFM56-7B24 series (registry code 13044, https://openairdocs.org/engine/cfm-international-cfm56-7b24-series) (OpenAirDocs)
- Reported make and model: BOEING 737-7H4
- Reported engine: CFM INTL CFM56-7B24
- People aboard: 41
- Fatal injuries: 0
- Other injuries: 0
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20121129029109I

## Narrative

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

AFTER TAKEOFF (DURING CLIMB OUT) THE NUMBER 2 (RIGHT) ENGINE EXPERIENCED AN UNCOMMANDED ACCELERATION TO 109 % N1.  THE FLIGHT CREW DISENGAGED THE AUTO THROTTLE SYSTEM AND REDUCED POWER ON THE NUMBER 2 ENGINE.  THE NUMBER 2 ENGINE POWER BEGAN TO STABILIZE AFTER THE POWER WAS REDUCED.  THE AIRCREW ELECTED TO RETURN TO DENVER INTERNATIONAL.  AS THEY INITIATED A TURN TO DENVER, THE NUMBER 2 ENGINE ROLLED BACK TO A SUB-IDLE CONDITION AND EXPERIENCED AN OVER TEMPERATURE CONDITION AND THE AIRCREW SHUT IT DOWN.  NEAR SIMULTANEOUSLY, THE NUMBER 1 ENGINE RECOVERED ACCELERATED UNCOMMANDED TO APPROXIMATELY 113 % N1.  THE NUMBER 1 ENGINE RECOVERED FROM THE OVERSPEED AND THE AIRCRAFT RECOVERED SAFELY ON ONE ENGINE AT DENVER INTERNATIONAL.  THE EVENT CAN BE CLASSIFIED AS A DUAL OVERSPEED DUE TO THE CIRCUMSTANCES INVOLVED.  MAINTENANCE PERSONNEL INSPECTED BOTH ENGINES FOR DAMAGE BUT COULD NOT IDENTIFY ANY.  FDR DATA INDICATES THAT THE ENGINES MAY HAVE EXPERIENCED SEVERAL COMPRESSOR STALLS DURING THE INCIDENT SEQUENCE HOWEVER THE AIRCREW DID NOT NOTE ANY COMPRESSOR STALLS.  BOTH ENGINES WERE REPLACED BY THE OPERATOR.

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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