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Forum:	Commercial Space - Military Space
Topic:	[Discuss] Boeing Starliner Crew Flight Test

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Your Reply: HTML is ON UBB Code is ON Smilies Legend	[QUOTE]Originally posted by Robert Pearlman: [B]According to ULA CEO Tory Bruno... <BLOCKQUOTE>[i]If this was a satellite ... the satellite would already be in orbit.[/i]</BLOCKQUOTE> The scrub tonight was called based on flight rules, not because of the severity of the issue. For crewed missions, ULA's agreed upon flight rules are not to change the state of the fueled vehicle when the crew is present. <BLOCKQUOTE>[i]Every now and again, in rare occasions, a valve like this can get into a position where it's just off its seat and it'll flutter, or buzz like in this case. We've seen short buzzes maybe three or four times and what we would typically do is activate the solenoid, which forces the valve closed, cycling the valve. Then you turn that off and you let it return and [the buzzing] almost always stops. In fact, this valve stopped. Once we had the crew off, we cycled the valve and it stopped buzzing.[/i]</BLOCKQUOTE> The issue now is if the buzzing was the result of the valve fully cycling at a rapid pace — fully opening and closing — and if so, how many times did it cycle. ULA has tested and certified the valve to 200,000 cycles. It is possible it could go for much more than that, but the valve was never tested to destruction. So tonight, engineers will be combing through data to count how many cycles have been put on the valve. If there is sufficient margin remaining, it is possible that a launch attempt could be made on Tuesday night. If not, then the valve needs to be replaced and that will take several days. The vehicle will need to be rolled back to the vertical integration facility (VIF) and pressure would need to be taken off the Centaur for the valve to be replaced. If that is the situation, the soonest ULA might be ready to proceed with a launch would be on Sunday (May 12). NASA would then need to see what it could support, likely landing the next attempt mid-next week (May 14 or 15). An answer should come sometime on Tuesday on how they will proceed.[/B][/QUOTE]
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