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Running retrofitting SpaceX postponed due to a fault on the Space Station – Space Flight Now



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Wing solar array on the International Space Station visible in this figure. Credit: NASA

Supply ship SpaceX Dragon is packed with nearly three tons of experiments, the position of crew and supplies will remain on the ground until at least Friday morning, to give more time for managers NASA to eliminate the problem by using an electric switchboard on the International Space station.

Several sources said the commercial launch of replenishment, previously scheduled for Wednesday, will be pushed back at least two days to no earlier than Friday night at 3:11 EST (0711 GMT).

The delay allows time for NASA mission control at the Johnson Space Center in X & # 39; Euston to continue diagnosing problems with a box of distribution of the power supply system Space Station. Engineers discovered a problem with the main unit by switching the bus on Monday morning, and ground crews may choose to replace a component later this week, before starting SpaceX cargo.

Block with & # 39 is one of several routes, that the power of the US solar space station to the electrical channels research outpost. Suspect unit distributes power two of the eight channels on the electrical station, including power supplies for robotic manipulator space station, which station astronauts will use to capture cargo ship Dragon, as it is approaching the complex.

While the robot arm is powered through a separate channel, NASA flight rules require standby power for the hand during critical operations, such as grab the free flight of the spacecraft.

Ground crews replaced the faulty Main Bus Switching with the help of the robot manipulator station before. Possibility robotic replace the power distribution box means that astronauts do not you may have to conduct a spacewalk to perform this task.

Electric bug system is not of direct interest to the station or its six-man crew, NASA said.

Orbit Carbon Observatory-3 NASA (OCO-3), and the US military Space Test Program-X & # 39; Euston 6 (STP-H6) payloads, taking into account established in the trunk Dragon spacecraft SpaceX inside of the & # 39 SpaceX facility in the NASA space center Kennedy in Florida on March 23, 2019: NASA

"On Monday morning, the team has identified an issue with the electricity system of the International Space Station and is working to determine the cause and restore the full strength of the system," said space agency up to date posted on its website.

The update is Monday afternoon, officials said that the engineers considered unspecified issue with the Switching Unit Main Bus.

"Managers work at the capacity on the route through the remaining six energy channels," NASA said. "Electric power generated by the solar battery station served to all systems of power stations through these channels."

NASA said on Monday afternoon that managers discussed how the problem of the power supply system may affect plans to launch SpaceX replenish stocks.

If the Dragon spacecraft was launched on Wednesday, he was due to arrive at the station on Saturday morning. Assuming that the launch from Cape Canaveral on Friday morning, the cargo freighter Dragon is expected to achieve an integrated early on Sunday morning.

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Follow Stephen Clark on Twitter: @ StephenClark1.

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