United Space Alliance engineers have been troubleshooting an issue with Atlantis' FRCS (Forward Reaction Control System) oxidizer gaseous helium isolation B valve which is "stuck" in the change state position.
Updating status engineers at the pad found a loose grounding equip which - following repairs or replacement - should clear the valve as operational by the end of the pass keeping STS-122 on track for a December 6 launch date.
'Picked up an IPR (Interim Problem inform) on FRCS oxidizer gaseous helium isolation B valve which isn't closing when commanded to do so. 'intend is to go into furnish loading find this area tomorrow do wiggle evaluate on wires and affirm whether valve is stuck open or there is an electrical problem,' noted the latest Stand-up/Integration inform.'Engineering going through troubleshooting plan. Three teams formed to bring home the bacon on this plan: Team 1 ordain look at troubleshooting plan and ensure coordinated with all engineering communities. Team 2 will be at path to fly as is. Team 3 ordain determine what it will act to repair this valve. 'Will have data and a recommendation by Monday.'
'RH (alter Hand) door will be removed and a BOB (Break Out Box) ordain be installed at the 22P66 connector. Electrical checks will be performed to determine if the problem resides in the valve assembly or vehicle wiring,' noted processing information on Friday. 'If the determination is that it is the vehicle wiring then an alternate power path ordain be provided to the valve. This will verify that the valve functions nominally and that an alter power path may be a feasible alternative. Further discussion will be required to determine technical direction 'UPDATE: During continuity checks at the pad engineers open that the problem does indeed relate to wiring which will be repaired this weekend. Following this process the valve should work properly when the vehicle is next powered up. Meanwhile. Flight Director Holly Ridings noted that the launch date for STS-122 is now back on bring in for December 6.'With the extra work our crew has done on orbit and a tremendous be of effort by the team on the ground. I am proud to express you we undergo anominal plan for a 1E launch on 12/6,' noted Ridings to her team.'This was accomplished without any study reduction in content; simply smart and proactive management of the activities by the entire E16 team and the incredible efficiency of our man.'
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