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[i]During an attempt to transition to fast fill for core stage hydrogen a leak was identified in the tail service mast umbilical. Teams have paused LH2 and the rocket is currently in a safe configuration.
Under the unique operating conditions with the rocket we are prepared and know leaks are a realistic possibility. We have amazing hazardous gas and leak detection systems that keep the rocket safe and alert us to conditions outside of normal parameters.
Hydrogen is extremely hazardous, cold, and a small molecule that is known for leaking. All of these systems have been sealed, leak checked and tested to the highest extent possible prior to wet dress rehearsal.
The launch director has given approval for the team to proceed with operations to chilldown the ICPS LH2 lines to collect additional data. Engineers do not plan to load LH2 or LOX into the ICPS tanks.
The team will keep the core stage LH2 tank at about 5% and the core stage LOX loading will remain stopped. The team will not conduct the terminal countdown activities today as planned and will assess next steps after today's operations.[/i]
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