SpaceX called off the maiden flight of its next-generation Starship rocket with just 40 seconds left on the countdown clock on May 21, 2026, after a hydraulic pin on the launch tower arm failed to retract as required. The scrub, at Starbase in Texas, delayed Flight 12 of Starship and the first test of the upgraded Version 3 vehicle.
According to a report by TechCrunch, the countdown had already been recycled multiple times due to minor rocket and launchpad system issues before the automatic abort was triggered at the T-40 second mark. SpaceX CEO Elon Musk explained the cause directly on X: “The hydraulic pin holding the tower arm in place did not retract.” Musk added that if the problem could be resolved overnight, the company would attempt another launch on Friday, May 22, at 5:30 p.m. local time.
Three separate technical faults contributed to the scrub: an error with a water diverter on the launch pad, a fault in the quick-disconnect system linking the rocket to ground equipment, and the hydraulic pin failure on the tower arm. Together they prevented the automated countdown from clearing the final hold and proceeding to ignition.
Starship Flight 12 represents the first test of the Version 3 configuration, which introduces several significant upgrades over earlier iterations. The new vehicle features third-generation Raptor engines with increased thrust in a more streamlined design, one fewer grid fin than previous versions, improved propellant containment to prevent leaks in the upper stage, and a redesigned structure intended to make booster capture by the launch tower more reliable. For this flight, SpaceX planned a soft landing for the Super Heavy booster in the Atlantic Ocean and a soft splashdown for the upper stage in the Indian Ocean, with no catch attempts by the tower arms.
The stakes are high. SpaceX filed for an initial public offering in the weeks leading up to the launch attempt, making demonstrable progress with Starship particularly important for investor confidence. The programme is also central to NASA’s Artemis architecture, with a Starship variant selected as the human landing system for crewed lunar surface missions. Flight 12 was the first Starship test since October 2025, and both the company and its partners are watching closely for evidence that the Version 3 upgrades deliver the reliability improvements SpaceX has promised.
