HOUSTON: Solid, solid rocket boosters are burning 11,000 pounds of propellant every second.
Coming up on one minute, 45 seconds. Standing by for first-stage separation of the solid rocket boosters.
Atlantis is at an altitude of 129,000 feet, 24 miles in altitude, 25 miles downrange. All three engines are still performing as expected.
SRB separation and staging confirmed.
All three electrically producing fuel cells are operating as expected, as are the hydraulic systems, the auxiliary power units.