STS-119
Orbiter: OV-103 / ET-127 / BI-135 / RSRM-103 (PAD A)
• A Scrub was called at 1432 EDT due to a GH2 leak at the Ground Umbilical Carrier Panel (GUCP) external to the External Tank (ET).
• Next Launch attempt will be no earlier than Sunday, March 15th.
• S0007.300: Launch Countdown
o No PRSD Offload.
o RSS Mate complete at 2305 EDT.
o ET LH2 Boil-off in work.
o LO2 and LH2 TSM Mechanical Carrier Plate Securing are complete.
o Triple flip access to the port side has been restored.
• New IPR 119V-0070, resulting in launch scrub: During LH2 ET tank transition from fast fill to topping a leak was detected by both LH2 leak detectors at the GUCP.
Tank fill was stopped and the vent valve was cycled to try to eliminate the leak with no success.
The line was purged with helium to reduce the concentration of Hydrogen. Following this, the valve was cycled with hydrogen and the concentration increased confirming the leak was still present.
This IPR will be transferred to ET Mechanical Engineering for further disposition. Troubleshooting will begin this afternoon when boil-off is complete and the area is cleared for access.