NTSB Identification: ENG11IA043
Scheduled 14 CFR Part 121: Air Carrier operation of Delta Air Lines
Incident occurred Saturday, August 06, 2011 in Atlanta, GA
Probable Cause Approval Date: 11/18/2014
Aircraft: MCDONNELL DOUGLAS DC-9-51, registration: N676MC
NTSB investigators traveled in support of this investigation and used data obtained from various sources to prepare this aircraft incident report.
Based on metallurgical analysis, a fan blade in the No. 2 engine separated at the blade root due to a high cycle fatigue crack when the engines were accelerated for takeoff. The liberated blade entered the gas path and caused damage to the inlet guide vanes, the remaining fan blades, fan exit guide vanes, and low pressure compressor as it was ingested. The mid span shrouds on the remaining fan blades exhibited shingling and witness marks also consistent with impact from the separated blade. The crew reacted to the engine failure and were able to abort takeoff and safely stop the airplane on the runway surface.
The National Transportation Safety Board determines the probable cause(s) of this incident to be: The probable cause of the No. 2 engine failure and subsequent aborted takeoff was the high cycle fatigue failure of a fan blade near the blade root that resulted in extensive low pressure compressor damage and compressor case breach. Full narrative available
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