Rocket engineers sailed through the repaired shuttle Discovery's second countdown Friday, readying the ship for takeoff Sunday on a thrice-delayed "Star Wars" test flight running two months behind schedule.

With Air Force meteorologists calling for a 70 percent chance of good weather at launch time, Discovery and its seven-man crew are scheduled to thunder away at 5:01 a.m. MDT Sunday to kick off the first unclassified military flight in shuttle history."Right now, everything's proceeding as scheduled," said NASA test director Eric Redding. "There are no technical problems out there and . . . I don't see any problem at this point in making a Sunday launch."

At the controls will be commander Michael Coats, 45, a Navy captain, and co-pilot Blaine Hammond, 39, a lieutenant colonel in the Air Force.