Billionaire Chris Cline died in a helicopter crash on July 4 near the Bahamas. (LILA PHOTO)

The helicopter carrying coal billionaire Chris Cline began spinning before it plunged into the ocean near the Bahamas and killed everyone on board, federal authorities said Tuesday.

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The National Transportation Safety Board’s preliminary report details the July 4 accident and its aftermath but doesn’t include a cause. Cline, his daughter Kameron and three of her friends died along with a pilot and copilot in the crash off Cline’s private Big Grand Cay island.

The aircraft was leaving the island to take two passengers to Florida for medical treatment, the NTSB said.

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