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- Feb 4, 2008
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Up until now, all of the major problems encountered has been on the ground side, not the vehicle the side. The two hydrogen leaks were with the QDs on the hydrogen Tail Service Mast Umbilical (TSMU) which are GSE on the ML itself, so ML problems. The ICPS helium checkvalve issue turned out to be FOD and not a valve problem at all, once the FOD had been removed, the valve worked normally again and has been ever since, it was never replaced. It is however unknown where the FOD came from, but it is highly suspected that the ICPSU on the ML might be the source, so again an ML problem.
Today was the first time that they encountered significant vehicle problems, the Engine 3 bleed issue and the vent valve issue. The vent valve however has been checked out multiple times including during the last WDR and it always worked fine so it will be interesting to see the root cause of that one. The Engine 3 bleed issue seems to be not in the engine itself but rather the egine bleed plumbing in the Engine Section as the other three engines were also off but still within their LCCs. A forward plan will be presented to the MMT tomorrow after the team had some time to rest and study the data more closely.
Today was the first time that they encountered significant vehicle problems, the Engine 3 bleed issue and the vent valve issue. The vent valve however has been checked out multiple times including during the last WDR and it always worked fine so it will be interesting to see the root cause of that one. The Engine 3 bleed issue seems to be not in the engine itself but rather the egine bleed plumbing in the Engine Section as the other three engines were also off but still within their LCCs. A forward plan will be presented to the MMT tomorrow after the team had some time to rest and study the data more closely.