DLTOTC configure field cell, essential buzzer switches. Central buzzers are connected to field cell. Copy. The orbiter access arm can be moved back into position around the hatch in about 30 seconds should an emergency occur. T-minus 7 minutes in counting. Next milestone is the start of the auxiliary power units by pilot Kevin Greggle. Start the three switches in the cockpit to start each of the three APUs and then work that's complete. And that's a good. Now moving the flight controls through their test pattern. The three main engines now being gippled. The two main engines are in one memory, terrified, no one expected errors. And the gaseous oxygen fan hood which fits. And then on retraction underway on schedule. T-minus 90 seconds. Sound suppression water system now being armed. Standing by for the handoff to discoveries on board flight computers at T-minus 31 seconds. T-minus 90 seconds. The result of the contingencies is good. The two main engines are in one memory, terrified, no one expected errors. Discovery Houston, go ahead throttle up. Discovery now 63,000 feet in altitude. Twenty seconds left in first stage performance of the Solar Rocket boosters. Discovery approaching the 155,000 foot mark in altitude, some 26 miles down range. Booster officer confirms Solar Rocket booster separation.