English subtitles for clip: File:Challenger Launch and Breakup.ogv

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T−10

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9

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We have main engines start.

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1

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and liftoff!

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Liftoff… of the 25th Space Shuttle mission

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and it has cleared the tower.

Houston challenger roll program
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CAPCOM (Dick Covey): "Roger roll, Challenger."

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Good roll program confirmed.

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Challenger now heading downrange.

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Engines beginning throttling down now, at 94%.

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Normal throttles for most of the flight, 104%.

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Will throttle down to 65% shortly.

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Engines at 65%, three engines are running normally.

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Three good fuel cells, three good APUs.

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Velocity 2,257 feet per second,

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altitude 4.3 nautical miles, downrange distance 3 nautical miles.

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Engines throttling up, three engines now to 104%.

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CAPCOM: "Challenger, go at throttle up."

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Challenger: "Roger, go at throttle up."

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One minute 15 seconds, velocity 2,900 feet per second,

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altitude 9 nautical miles, downrange distance 7 nautical miles.

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Flight controllers here are looking very carefully at the situation.

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Obviously a major malfunction.

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We have no downlink.