United Launch Alliance postponed the return-to-flight mission of its Vulcan Centaur rocket on Friday morning. The rocket was scheduled to liftoff from Space Launch Complex 41 at Cape Canaveral Space Force Station at 12:54 p.m. Eastern Time. Enclosed within the payload fairing were forty Leo commercial broadband satellites belonging to Amazon. Mission controllers halted the countdown following telemetry irregularities detected within ground-based industrial nitrogen supply lines. Launch operations will stand down for twenty-four hours.
The flight represents Vulcan Centaur's first orbital attempt following a nine-month hiatus dedicated to upper-stage verification and manufacturing reviews. It also serves as the operational debut for Amazon's commercial constellation deployment on the heavy-lift vehicle. Launch engineers safely safed the vehicle and payload while technicians inspected ground pneumatic valves. Both the booster and satellites remained fully functional.
Engineers determined that pressure fluctuations within the ground nitrogen system compromised purge operations required before cryogenic propellant loading. Launch Director Tom Heter III scrubbed the Friday countdown to permit technicians to replace ground pressure regulator assemblies. A backup twenty-nine minute launch opportunity opens Saturday at 12:54 p.m. Eastern Standard Time. Meteorological officers forecast eighty percent favorable weather conditions across coastal Florida.
Amazon aims to deploy more than three thousand satellites into low Earth orbit to deliver global broadband coverage to rural and enterprise customers. The tech giant contracted dozens of launches across United Launch Alliance, Arianespace, and Blue Origin to meet federal deployment deadlines. Under the commercial launch services agreement, ULA will deploy hundreds of operational spacecraft across dedicated Vulcan flights. Officials stated that Amazon Leo would launch 40 satellites aboard ULA's Vulcan rocket on November 13, 2026, beginning a 38-mission partnership.
