By David Shepardson WASHINGTON (Reuters) -A U.S. National Transportation Safety Board investigation found ineffective actions by Boeing and ineffective oversight by the Federal Aviation Administration that led to a mid-air cabin panel blowout of a new 737 MAX 9 flight in January 2024 that spun the planemaker into a major crisis,

The National Transportation Safety Board is set to vote on likely causes of January 2024 accident and make recommendations.

The nation's top safety investigators concluded that a lack of basic safety processes at Boeing, coupled with an inexperienced workforce, contributed to the door plug blowout in January 2024.