An anomaly during testing of Centaur upper stage has grounded the new rocket for a spell.
United Launch Alliance's plans for the first launch of its new Vulcan rocket have been complicated by a violent explosion during testing of the rocket's upper stage.
However, on March 29, a Centaur upper stage suffered an anomaly and exploded during testing at NASA's Marshall Space Flight Center in Alabama. The incident was first reported by Ars Technica.
ULA CEO Tory Bruno later shared footage of the incident on Twitter, revealing that the blast followed a hydrogen leak that then dramatically ignited.
The upper stage that exploded was not part of the hardware for the first launch, but the investigation needs to be completed before Vulcan is clear to fly.
Bruno has since stated that the first Vulcan flight is likely going to be delayed into June or July, adding to years of delays to the program, including delayed delivery of engines built by Blue Origin, Jeff Bezos' aerospace company.
The Vulcan Centaur stands 202 feet (62 meters) tall and is capable of lifting 7.7 tons (7 metric tons) to geostationary orbit. It is designed to replace ULA's workhorse Atlas V and Delta IV launch vehicles
Vulcan is powered by a pair of Blue Origin-built BE-4 methane-liquid oxygen propellant engines in its first stage and up to six solid rocket boosters.
The rocket has plenty of action ahead, despite its setbacks. NASA will add Vulcan to its catalog of launchers for future missions, while Amazon has contracted ULA for 38 Vulcan launches to support the deployment for its Project Kuiper communications constellation.