Skywest CRJ7 at Chicago on Jun 10th 2017, uncontained engine failure

Last Update: May 4, 2019 / 20:24:50 GMT/Zulu time

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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

A Skywest Canadair CRJ-700 on behalf of American Airlines, registration N715SK performing flight OO-2985/AA-2985 from Chicago O'Hare,IL to Flint,MI (USA) with 54 people on board, was in the initial climb out of runway 28R when the crew reported an engine (CF34) failure and advised they needed to return as soon as possible onto the longest runway available. The crew stopped the climb at 4000 feet, reported they had a left hand engine fire indication, positioned for an approach to runway 28C and landed safely about 10 minutes after departure. After landing the crew reported they had no fire indication anymore and vacated the runway.

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
Registration mark
N715SK
Country of Registration
United States
Date of Registration
GAqpjpkhqcdnbjAe Subscribe to unlock
Manufacturer
BOMBARDIER INC
Aircraft Model / Type
CL-600-2C10
Number of Seats
Bf Subscribe to unlock
ICAO Aircraft Type
CRJ7
Year of Manufacture
Hipl Subscribe to unlock
Serial Number
Gkggm Subscribe to unlock
Aircraft Address / Mode S Code (HEX)
Nhchpk Subscribe to unlock
Engine Count
M Subscribe to unlock
Engine Manufacturer
i Subscribe to unlock
Engine Model
BkcmcefqeAl Subscribe to unlock
Engine Type
H mlkjnlp Subscribe to unlock
Pounds of Thrust
P il Subscribe to unlock
Main Owner
DnbcpAd ejcpqelpmbhAmil hcfA AibibfAk miAdbpjqme lfAbnf jcdbebgn gccAqbhemk Subscribe to unlock
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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