WASHINGTON, Jan 30 (Reuters) - Investigators probing the

cause of a deadly passenger jet crash in Washington aim to have

a preliminary report on their findings within 30 days, a member

of the National Transportation Safety Board said on Thursday.

"Our intention is to have a preliminary report within 30

days, and the final report will be issued once we've completed

all our fact finding and investigation," safety board member

​​​J. Todd Inman said at a news conference.