The National Transportation Safety Board is expected to issue its report this month.
But just this week, the National Transportation Safety Board said that effort was not working.
The cause was under investigation by the National Transportation Safety Board, he said.
An investigation was opened by the National Transportation Safety Board.
The National Transportation Safety Board sent a team for further investigation.
The National Transportation Safety Board said tonight that it had just started its investigation.
She is vice chairman of the National Transportation Safety Board.
National Transportation Safety Board will have people there, too, to assist.
Key officials of the National Transportation Safety Board said they had no sure evidence on the direct cause.
The reason, according to the National Transportation Safety Board, is bad design.
The National Transportation Safety Board is expected to issue its report this month.
But just this week, the National Transportation Safety Board said that effort was not working.
The cause was under investigation by the National Transportation Safety Board, he said.
An investigation was opened by the National Transportation Safety Board.
The National Transportation Safety Board sent a team for further investigation.
The National Transportation Safety Board said tonight that it had just started its investigation.
She is vice chairman of the National Transportation Safety Board.
National Transportation Safety Board will have people there, too, to assist.
Key officials of the National Transportation Safety Board said they had no sure evidence on the direct cause.
The reason, according to the National Transportation Safety Board, is bad design.
