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Forum:	Exploration: Moon to Mars
Topic:	[Discuss] NASA's Artemis II mission (Orion)

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Your Reply: HTML is ON UBB Code is ON Smilies Legend	[QUOTE]Originally posted by Robert Pearlman: [B]NASA did not solve the problem of hydrogen leaks during the Apollo or space shuttle program. They did, as they do now, work to halt the leak and then decided whether to press forward or scrub. In the final hours of the Apollo 11 launch countdown on July 16, 1969, as the crew was getting to board, a major hydrogen leak was detected. <BLOCKQUOTE>[i]This is Apollo Saturn Launch Control; T minus 2 hours, 45 minutes, 55 seconds and counting... We have discovered a problem at the launch pad itself as the crew is about to arrive. We have a leak in a valve located in a system associated with replenishing liquid hydrogen for the third stage of the Saturn V launch vehicle. We have sent a team of three technicians and a safety man to the pad and these technicians are now tightening bolts around the valve. Once the technicians depart, we will send hydrogen again through the system to assure that the leak has been corrected.[/i]</BLOCKQUOTE> Sometimes NASA didn't catch the leak until the situation worsened. On STS-41D... <BLOCKQUOTE>[i]... a hydrogen fire, invisible to the naked eye, had broken out at the aft end of the orbiter. Had the crew evacuated at that time, they would have run through the invisible flames. The pad's fire suppression system came on to deal with the fire, and when the crew did finally egress the shuttle, they received a good dousing of water. The crew returned safely, if a little drenched, to crew quarters. After ground teams assessed the cause of the abort, they made the decision to roll the stack back to the VAB, demate Discovery from the ET and SRBs and tow it back to the OPF. Workers replaced the faulty engine, and Discovery rolled back out to the launch pad on Aug. 9 for another launch attempt...[/i]</BLOCKQUOTE> These situations are, at their essence, the same that occurred during the Artemis II wet dress but occurred during a live launch countdown instead of a test. [/B][/QUOTE]
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