Skywest CRJ7 at Chicago on Jun 10th 2017, uncontained engine failure
Last Update: May 4, 2019 / 20:24:50 GMT/Zulu time
Incident Facts
Date of incident
Jun 10, 2017
Classification
Incident
Airline
Skywest Airlines
Flight number
OO-2985
Departure
Chicago O'Hare, United States
Destination
Flint, United States
Aircraft Registration
N715SK
Aircraft Type
Canadair CRJ-700
ICAO Type Designator
CRJ7
The FAA reported a blade went through the cowling when the engine failed.
On Jun 20th 2017 the NTSB reported that the crew heard a loud bang followed by power reduction and a fire warning from the left hand engine. The crew declared emergency and returned to Chicago for an uneventful landing. A visual inspection of the left hand engine revealed extensive turbine damage, a large hole to the engine cowl, multiple small impact marks were found on the fuselage aft of the #1 engine. The engine failure was rated uncontained, the NTSB is investigating the occurrence rated an incident.
On Oct 24th 2018 The Aviation Herald received photos and information that the combustion outer liner shell showed large cracks. The low pressure turbine case as well as the aft core cowl were breached by burn holes.
On May 4th 2019 the NTSB released their final report concluding the probable cause of the incident was:
A Bombardier CRJ700 No. 1 engine failure caused by buckling of the combustion outer liner due to fatigue cracks. The liner buckling resulted in airflow disruption and reduced engine performance. The engine fuel control unit attempted to compensate for the decrease in engine performance by increasing the fuel flow rate. The combustion liner damage and increased fuel flow led to incomplete combustion of the fuel injected into the combustion chamber. Unconsumed fuel then ignited downstream of the combustion chamber (delayed ignition) and resulted in high pressure turbine thermal damage, and the eventual separation of a high pressure turbine 2nd stage nozzle vane segment. The separated vane segment subsequently caused low pressure turbine case burn through and catastrophic impact damage to the high and low pressure turbine stages.
The NTSB powerplant group chairman's factual report contains 18 pages detailing the engine examination and 20 photos.
Aircraft Registration Data
Incident Facts
Date of incident
Jun 10, 2017
Classification
Incident
Airline
Skywest Airlines
Flight number
OO-2985
Departure
Chicago O'Hare, United States
Destination
Flint, United States
Aircraft Registration
N715SK
Aircraft Type
Canadair CRJ-700
ICAO Type Designator
CRJ7
This article is published under license from Avherald.com. © of text by Avherald.com.
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