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NASA and SpaceX have postponed the Dragon launch to investigate the hydrazine issue.
Science

NASA and SpaceX have postponed the Dragon launch to investigate the hydrazine issue.

Due to a problem with the prelaunch loading of hypergolic propellants, NASA and SpaceX have postponed the launch of a Cargo Dragon spacecraft for at least a few weeks.

The space agency had planned to launch the spacecraft on June 12, but in an email to media on Monday evening, it revealed the delay.

'Elevated vapour readings of mono-methyl hydrazine were observed in an isolated section of the Draco thruster propulsion system during fuel loading of the Cargo Dragon spacecraft,'

The space agency said in a statement. 'The propellant and oxidizer have been removed from that area to allow for additional inspections and testing.'

The Dragon spacecraft's on-orbit manoeuvring propulsion is provided by Draco thrusters. NASA said it is collaborating with SpaceX to determine the source of the abnormal readings and take any necessary corrective measures.

Mission Control in Houston informed astronauts on board the International Space Station on Tuesday morning that the launch date will be delayed until at least June 28.

This isn't a brand-new Dragon model. This vehicle, codenamed Dragon 'C208,' has previously flown two supply missions, both in 2021. The 'Cargo Dragon 2' is an enhanced version of the original Cargo Dragon spacecraft.

Because the thruster system in this Cargo Dragon variant has a lot in common with Crew Dragon, which also employs Draco thrusters and the same hypergolic propellants, NASA will want to investigate this thoroughly.

The next Crew Dragon launch, carrying the 'Crew 5 mission,' isn't slated until September, so there should be plenty of time for this job.

The thrust of these Draco thrusters is substantially lower than that of the SuperDraco thrusters that power Crew Dragon's launch escape system.

A leak of oxidizer shortly prior to activation of these SuperDraco thrusters caused an explosion that destroyed a spacecraft during a test in April 2019. There were no injuries.

Although the Cargo Dragon lacks the SuperDraco thrusters, NASA and SpaceX will be interested in learning more about them.

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