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Sat, Jun 13, 2009

Scrubbed! Hydrogen Leak Postpones STS-127 Launch

Gaseous Hydrogen Leak Creates Launch Hazard

A gaseous hydrogen leak on a vent line for space shuttle Endeavour is postponing Saturday morning's launch of Endeavour. The official scrub time was 0026 EDT. Launch teams began draining Endeavour's external fuel tank of its liquid hydrogen and liquid oxygen at 0006.

Fueling was halted after the leak was detected near the Ground Umbilical Carrier Plate, or GUCP, which attached to the external tank at its intertank area. The line leads from the GUCP back to the launch pad and to the "flare stack" where vented gaseous hydrogen is burned off.

The leak is similar to what happened during the first launch attempt of space shuttle Discovery's STS-119 mission in March.

After the leak is assessed, shuttle managers plan to meet Saturday morning to discuss what steps to take next, including targeting a new launch date for Endeavour's STS-127 mission to the International Space Station, though current estimates indicate that another launch attempt is at least 96 hours off.

Mission STS-127 is the 32nd flight dedicated to station construction, and the final of a series of three flights dedicated to the assembly of the Japanese Kibo laboratory complex.The STS-127 payload is the Kibo Japanese Experiment Module Exposed Facility and Experiment Logistics Module Exposed Section.

FMI: www.nasa.gov

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