GoJet CRJ7 near Saint Louis on Nov 29th 2016, uncontained engine failure
Last Update: March 8, 2018 / 15:01:33 GMT/Zulu time
Incident Facts
Date of incident
Nov 29, 2016
Classification
Incident
Airline
GoJet Airlines
Flight number
DL-6210
Departure
Cincinnati, United States
Destination
Denver, United States
Aircraft Registration
N367CA
Aircraft Type
Canadair CRJ-700
ICAO Type Designator
CRJ7
The NTSB reported the engine suffered an uncontained failure, a visual inspection showed debris had penetrated the turbine case, however, had not penetrated the nacelle. The engine was removed and shipped for further examination. The NTSB have opened an investigation.
On Mar 8th 2018 the NTSB released their final report concluding the probable cause of the incident was:
The probable cause of the uncontained No. 1 (left) engine failure was a separated high pressure turbine 2nd stage blade that failed due to a fatigue crack that originated below the blade platform from an area of corrosion.
The NTSB wrote:
Metallurgical analysis of the HPT 2nd stage blades that separated below the platform concluded that the first blade to separate failed due to a high cycle fatigue crack that originated from an area of corrosion on the convex side. Six additional blades separated below the blade platform at high cycle fatigue cracks that had transitioned to overload due to impact damage from the initial blade release. The remaining blades in the HPT 2nd stage separated above the blade platform due to overload consistent with secondary impact damage. Multiple blades that separated above the blade platform also had fatigue cracks present below the blade platform that originated from areas of corrosion. The corroded areas contained elements including: sulfur, sodium, potassium, and phosphorus, which are common corrosive elements. The source of the corrosive elements could not be identified.
The engine water wash schedule was reviewed and according to GoJet Airlines, water washes are performed on their CF34-8C engines every 1,200 flight hours, or when engine trend data shows performance degradation. GE currently recommends water washing the engine at every -2A check, or about 1,600 flight hours. A GE service bulletin applicable to CF-348C engines is scheduled to be released in the first quarter of 2018 that increases the water wash interval to 2,000 flight hours or when engine trend data shows performance degradation.
Aircraft Registration Data
Incident Facts
Date of incident
Nov 29, 2016
Classification
Incident
Airline
GoJet Airlines
Flight number
DL-6210
Departure
Cincinnati, United States
Destination
Denver, United States
Aircraft Registration
N367CA
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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