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from the adequately-explained-by-incompetence dept.
El Reg reports
Russian aerospace firm's kit fails on 46th mission
The embarrassing incident that two of Europe's Galileo satnav craft [landed] in the wrong orbit has been attributed to "a shortcoming in the system thermal analysis performed during stage design" for the launch [vehicle] Fregat's fourth stage, built by Russian aerospace outfit NPO Lavochkin.
As we reported back in August, two [failures] meant two Gallileo sats landed in the wrong orbit, causing much hand-wringing at the European Space Agency. The mess was later blamed on a software bug.
But Arianspace, the commercial launch operator that sent the birds aloft, now says that wasn't the case and that the mission's fourth stage was built to fail.
An internal investigation found that the three stages of the Soyuz launcher all performed as expected. But Fregat struck problems "at the beginning of the ballistic phase preceding the second ignition of this stage".
[...]failure was due to a temporary interruption of the joint hydrazine propellant supply to these [two attitude control] thrusters.
The interruption in the flow was caused by freezing of the hydrazine.
The freezing resulted from the proximity of hydrazine and cold helium feed lines, these lines being connected by the same support structure, which acted as a thermal bridge.
[...]sounds a bit like someone didn't properly account for how cold the launch vehicle would get, which froze its fuel, which in turn meant the rockets didn't fire enough or soon enough to get the satellites into the desired orbit.
This reminds me of the Space Shuttle that had been launched successfully many times, then in 1986 some suit at NASA decided that manufacturer's thermal specs for components didn't really matter.
Remember Feynman's glass of ice water?
Related:
(Score: 2) by Adamsjas on Saturday November 01 2014, @08:26PM
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