WASHINGTON, June 3 (Reuters) - A U.S. senator overseeing

aviation issues on Monday urged the head of the Federal Aviation

Administration to require transparency and accountability in

Boeing's ( BA ) quality turnaround effort.

Senator Tammy Duckworth, a Democrat who chairs a

subcommittee on aviation, said "Boeing's ( BA ) safety and quality

assurances will be meaningless without appropriate transparency

and accountability." Boeing ( BA ) on Thursday submitted a

comprehensive quality improvement plan after FAA Administrator

Mike Whitaker in late February gave Boeing ( BA ) 90 days to develop a

comprehensive plan to address "systemic quality-control issues."