Overview
- Engineers detected an interruption in helium flow to the Interim Cryogenic Propulsion Stage during routine repressurization following a successful fueling rehearsal.
- NASA says the rollback removes the March launch window, with the next available opportunities reported in early April, including April 1 and April 3–6.
- Helium is used to purge engines and pressurize the upper-stage propellant tanks, making the system critical for a safe countdown and flight.
- The rocket remains in a safe configuration with operators using a backup method to maintain environmental conditions as teams review data.
- Potential culprits under evaluation include a faulty filter, valve, quick‑disconnect umbilical interface, or a check valve, issues that require hands‑on access in the VAB.