Boeing sent a warning to plane operators in 2011 about the broken part that failed in the fiery UPS plane crash in Louisville, but said it was not a “safety of flight” issue at the time, federal regulators said Wednesday.

A new NTSB update says Boeing identified fatigue risks in a key MD-11 engine component years before a UPS crash that killed 15 people near Louisville.

About 14 years before an MD-11 aircraft flown by UPS crashed in Louisville, Kentucky, killing 15 people, Boeing warned about potential problems with the parts holding an engine in place, according to the National Transportation Safety Board.

An aviation attorney says Boeing is partly responsible for the UPS flight 2976 crash in Louisville because the NTSB found that a critical engine part that failed had been on Boeing's radar since 2011,

Boeing identified bearing race failures in 2011 bulletin, now central to NTSB probe into fatal UPS MD-11F crash that killed 14 in Louisville

A new report from the National Transportation Safety Board says years ago, Boeing flagged a potential issue with a bearing that was found fractured on the UPS plane that crashed.