After leveling out, the three remaining engines were supplying normal thrust. A restart attempt brought No. 4 back into use. They began climbing and reported to air traffic control "condition normal now" and continuing on to Los Angeles. They then noticed that the inboard main landing gear was down and one of the plane's hydraulic systems was empty. Because they did not have sufficient fuel to reach Los Angeles with the drag added by the landing gear, they diverted to San Francisco. An emergency was then declared and they flew straight into San Francisco airport. The plane landed without further incident.