National Transportation Safety Board (NTSB)

FAA warned of engine issue days before KNBC helicopter crash
The FAA said an incorrectly-installed engine flange on some Airbus AS350 helicopters could cause a helicopter pilot to lose control of the aircraft.
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NTSB investigators begin probe of deadly KNBC-TV helicopter crash
Video footage captured on board KNBC-TV's helicopter is providing early clues into what happened just before it crashed on Tuesday.
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