Discovery is behaving well during the early part of what is her final pad flow, with only one issue reported as the stack continues Launch Pad Validation tasks (S0009). Away from Pad 39A, managers are beginning their departmental Flight Readiness Review (FRR) meetings, leading up to the key Agency FRR – which is likely to slip to just days prior to the launch date.
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Once at the pad, Discovery – as the STS-133 stack – underwent the initial S0009 operations, involving the extension of arms and connections between the shuttle and the MLP.
“Launch Pad Validation (S0009) Call-to-Stations was complete at 0139 EDT (Tuesday),” added the NTD report. “Orbiter Access Arm has been extended. Crew Module hatch has been opened. ET Intertank Access Arm extension is complete. ET GOX Vent Arm extended and the hood has been lowered. Fixed Service Structure to MLP Freon lines have been connected.”
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With the Rotating Service Structure (RSS) rotated to the mate position, the orbiter was powered up for the first time at the pad on Wednesday for checkouts. Engineers also worked on mating the Ground Umbilical Carrier Plate (GUCP) to the External Tank, prior to carrying out leak checks.
“OV-103 powered up at 0855 EDT and powered down at 2018 EDT (Tuesday). RSS was rotated to the mate position at 2038 EDT Tuesday. ET GUCP electrical mates are complete,” added the NTD report in midweek.
sts-127-gucp-work-061409“Hazardous Gas Detection flex hose connections to the GUCP is complete. GUCP vent line leak checks could not be performed due to orbiter powering down (moved to Wednesday first shift – resulting in:) GUCP leak checks are complete and good.”
The importance of a good leak check on the GUCP relates to the issue which caused scrubs during both STS-119 and STS-127′s tankings. Part of the solution involved a new two-piece flight seal being installed into the hardware.
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The STS-133 L-30 day Bench Review will take place on September 30 and October 1, ahead of the SSP FRR, now expected to be conducted over just the one day (October 7), as opposed to the usual two days. This is due to scheduling conflicts, which will also interrupt the schedule for the Agency FRR – which may slip a week to October 25 – less than a week ahead of the expected launch date.
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