Transcription: 10, 9, 8, 7, 6. We have main engine start. 4, 3, 2, 1 and liftoff. Liftoff of the 25th Space Shuttle mission and it has cleared the tower. Good roll program confirmed. Challenger now heading downrange. Engines beginning throttling down now at 94 percent. Normal throttles for most of the flight 104 percent. We'll throttle down to 65 percent shortly. Engines at 65 percent, three engines running normally, three good fuel cells, three good Good APUs. Velocity 2,257 feet per second. Altitude 4.3 nautical miles. Downrange distance 3 nautical miles. Engine's throttling up. Three engines now at 104%. ...
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