WASHINGTON (AP) - Federal officials have accepted Boeing's revamped battery system for its beleaguered 787 Dreamliners and intend to lift a 3-month-old order grounding the planes.
    
The Federal Aviation Administration said in a statement Friday that next week it will send airlines instructions and publish a notice lifting the grounding order. The lifting of the grounding order will be effective the day the notice is published.
    
Lifting the grounding order gives Boeing the go-ahead to begin retrofitting planes with an enhanced lithium ion battery system. The root cause of battery failures that led to a fire on one of the planes and smoke on another remains unknown.
    
Flights could resume within a week.