No Icing

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As the investigation into last month's plane crash in Montrose continues, the NTSB has ruled out at least one possible cause: icing.

Investigators say pilots of the private jet checked the wings for icing.

The plane was carrying NBC Sports President Dick Ebersol and his 2 sons.

A cockpit voice recorder captured a conversation between the captain and the co-pilot in which they believed the wings were clear of ice.

Icing reduces lift for a plane.

The crash killed the pilot, flight attendant, and Ebersol's 14 year-old son.