The
NTSB determined that the probable cause of the accident was "the
pilot's failure to adequately respond to an encounter with
whiteout conditions, which resulted in the helicopter's
collision with terrain."
The operator's inadequate pilot training program and pilot
competency checks also contributed to the accident, the NTSB
report added.
It also said the Federal Aviation Administration (FAA) principal
operations inspector's "insufficient oversight of the operator"
contributed to the incident. One passenger had survived the
crash but there was a delayed notification of search and rescue
organizations, the NTSB report showed.
Kellner was a towering figure in the Czech Republic's
post-communist era, amassing wealth estimated at the time of his
death at $17.5 billion according to Forbes.
He was the world's 68th richest person on Forbes' 2020 list,
tied with media giant Rupert Murdoch and his family.
His heirs filed a lawsuit in Alaska in April in the quest for a
probe into "potential negligence" that caused the deadly crash.
(Reporting by Kanishka Singh in Washington; Editing by Lincoln
Feast.)
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