Spaceflight Insider

CRS-17 Dragon mission scrubbed, teams to try again May 4

The Falcon 9 with CRS-17 before being raised to the vertical position in the hours before its May 3 launch attempt. Photo Credit: Scott Schilke / SpaceFlight Insider

The Falcon 9 with CRS-17 before being raised to the vertical position in the hours before its May 3 launch attempt. Photo Credit: Scott Schilke / SpaceFlight Insider

CAPE CANAVERAL, Fla. — SpaceX’s early-morning launch of its CRS-17 Dragon cargo resupply spacecraft was called off because of several technical issues.

While weather was the main concern for the May 3, 2019, Falcon 9 launch attempt, it was ultimately an issue with SpaceX’s drone ship, stationed about 17 miles (28 kilometers) off shore that prompted a “hold, hold, hold” call. However, there was also a helium leak on the ground side of the rocket that also needed to be addressed.

Initially, SpaceX was targeting May 1, 2019, for the flight of a Falcon 9 rocket with the CRS-17 Dragon spacecraft bound for the International Space Station, but a power failure aboard the outpost prompted a launch postponement to May 3 to give ground teams time to troubleshoot and replace the failed component, a Main Bus Switching Unit.

Flights to the International Space Station are timed for when the orbital plane of the outpost crosses the launch site. This effectively means there is no time to wait for better weather or to work technical issues as the window to get off the ground is essentially instantaneous.

With the scrub officially called at about 3 a.m. EDT (07:00 GMT), SpaceX teams are expected to attempt to solve the technical issues before trying again in about 24 hours. The next launch attempt is expected to be at 2:48 a.m. EDT (06:48 GMT) May 4.

The forecast is more favorable for the May 4 attempt with the 45th Weather Squadron predicting only a 30% chance of a weather-related rule violation.

SpaceX’s CRS-17 Dragon mission is slated to fly 5,500 pounds (2,500 kilograms) of supplies, equipment and experiments to the space station’s Expedition 59 crew.

Assuming a May 4 liftoff, Dragon should arrive at the outpost on May 6 and remain attached to the Harmony module until late May or the first part of June.




Derek Richardson has a degree in mass media, with an emphasis in contemporary journalism, from Washburn University in Topeka, Kansas. While at Washburn, he was the managing editor of the student run newspaper, the Washburn Review. He also has a blog about the International Space Station, called Orbital Velocity. He met with members of the SpaceFlight Insider team during the flight of a United Launch Alliance Atlas V 551 rocket with the MUOS-4 satellite. Richardson joined our team shortly thereafter. His passion for space ignited when he watched Space Shuttle Discovery launch into space Oct. 29, 1998. Today, this fervor has accelerated toward orbit and shows no signs of slowing down. After dabbling in math and engineering courses in college, he soon realized his true calling was communicating to others about space. Since joining SpaceFlight Insider in 2015, Richardson has worked to increase the quality of our content, eventually becoming our managing editor. @TheSpaceWriter

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