Discovery launch scrubbed again due to LH2 leak

November 5, 2010 12:42 by scibuff

Update 2: FURTHER DELAY. Shuttle Discovery won’t fly before November 30 at 09:05 UTC.
Update 1: The teams are now working a 72 hour scrub turnaround procedure instead of the 48 they originally started to call. The earliest opportunity for Discovery to launch will be on Monday, Nov 8.

Nov 5, 2010 – The launch of Space Shuttle Discovery has been officially scrubbed at 12:11 UTC due to a leak of Liquid Hydrogen at the Ground Umbilical Carrier Plate (GUCP) detected during the tanking process. Leaks at the GUCP delayed launches for STS-119 and STS-127.

The Ground Umbilical Carrier Plate

The Ground Umbilical Carrier Plate where a leak of liquid hydrogen has been detected during tanking - Credit: NASA TV

The teams are working a 48 hours turnaround 72 hours turnaround with launch targeted at 18:15:46 UTC on Sunday, as 24 hours is not enough to drain the External Tank (ET) to examine and resolved the issue. The current launch window closes on Sunday, November 7, 2010. The shuttle cannot launch between Nov. 8 and Nov. 23 because of a so-called beta angle cutout. Such cutouts are defined by the angle between the sun and the plane of the space station’s orbit. When it the beta angle is too high or too low, temperature constraints for the docked shuttle-station stack can exceed safety guidelines. Nevertheless, the Mission Management Team (MMT) is also looking into the possibility to launch on Monday, Nov 8 with a reworked flight plan.

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Astronews Daily (2455506)

[…] Discovery launch scrubbed again due to LH2 leak – Nov 5, 2010 – The launch of Space Shuttle Discovery has been officially scrubbed at 12:11 UTC due to a leak of Liquid Hydrogen at the Ground Umbilical Carrier Plate (GUCP) detected during the tanking process. Leaks at the GUCP delayed launches for STS-119 and STS-127. […]

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