During tests of the upper stage engine, streaks of molten metal could be seen pouring out from the nozzle—a telltale sign of a cooling issue.
the conclusions from the investigation on Wednesday after receiving a formal closure letter from the Federal Aviation Administration.
Astra’s Launch Vehicle 0010 blasted off from Cape Canaveral, Florida on June 12, carrying NASA’s TROPICS cubesats on board. About four minutes after the rocket’s second stage fired its engine, it exhausted its fuel supply and was only able to reach about 80% of the required orbital velocity, according to Astra.The investigation further revealed that this was due to a blockage of the fuel injector, which caused burn-through of the combustion chamber wall.
The company conducted further tests to figure out the temperature of the fuel during flight and found that external factors “like the warm sunny weather in Cape Canaveral on the day of launch,” resulted in fuel that was slightly warmer than usual, and this “helped to tip the fuel over into a boiling regime on the TROPICS-1 mission,” Astra wrote. But still, the fuel was already within thin margins of its boiling point because Rocket 3.
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