Crash

Preliminary report details dramatic moments aboard Tennessee air medical helicopter before fatal crash.

Investigators detail helicopter flights that led to a fatal accident late last month.

Investigators focus on fractured spherical bearing assembly following deadly UPS MD-11 Louisville accident in November.

Probable cause and safety recommendations to be addressed Jan. 27.

FAA, NTSB investigating single-engine accident in Southeast Texas.

TSB final report details deteriorating weather, improvised approaches and normalized deviations.

Investigators are examining the circumstances surrounding a Jan. 2 accident near Telegraph Canyon.

Report cites runway conditions and human error.

Cessna 172 went down while attempting to land Sunday afternoon.

Relatives press for progress as investigation lags.