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[i]During ascent, the capcom made the call 'negative seats.' This occurred as the shuttle climbed above 80,000 feet. At that altitude the ejection seats would still work, and the pressure suit had sufficient oxygen get back down so you may ask, why was that a limit? Because an analysis of the speed and trajectory above that point resulted in enough air friction heating to melt the plastic faceplate of the helmet. And probably other things we didn’t analyse.[/i]
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