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First spacewalk key step in truss activation BY WILLIAM HARWOOD STORY WRITTEN FOR CBS NEWS "SPACE PLACE" & USED WITH PERMISSION Posted: June 6, 2007 During the first spacewalk of STS-117, Reilly and Olivas must connect 13 electrical cables, split between two utility trays at the S1/S3 interface, to route power and data to and from the new truss segments and S1. They also must engage one of the two motors in the solar alpha rotary joint that eventually will move the outboard solar panels to track the sun; they must prepare the arrays themselves for extension; release the clamps holding a folding ammonia radiator panel in place; remove launch locks and re-arrange internal braces to stiffen the new truss components to withstand normal flight loads. They also plan to throw no-longer-needed thermal shrouds overboard. "The view out there is going to be absolutely awesome, potentially even intimidating to some extent," Olivas said. "I think if you don't find it intimidating you're liable to get careless, and so you have a healthy respect for the environment that you work in and recognize that you are on the tip of this very large structure. I'm very much looking forward not only to turning around and looking at Earth, both in daylight as well as the night, but also turning around and looking into space. Because I can imagine ... the only thing between you and the rest of the universe is, you know, a thin visor. I think it's going to be a pretty neat experience." Reilly will exit the Quest airlock module first, making his way across a spur to the S0 truss and from there out to the S1 segment where he will hook up two 85-foot-long safety tethers. At that point, Olivas will venture outside. "Now the way it works out in our EVA is that Jim Reilly kind of has all the real estate on the front side of the truss segment, and I have all the real estate on the back side of the truss segment," Olivas said. "One of the first things that happens after the installation has occurred, we have to basically start putting keep-alive power to all the subsystems on S3/S4." Reilly will make the electrical connections between S1 and S3, hooking up six cables near the upper part of the S1/S3 interface and seven in a lower utility tray. "While Jim Reilly takes care of that, my primary responsibility will be to start to get the solar array blanket boxes in from their stowed configuration, get them ready for the deployed configuration. We have a variety of restraints on those boxes that we'll have to pop off and get them ready. I'll do that for both the front side and the back side, the 1A and the 3A side. "After that's complete my next major task is to go down and reconfigure the photovoltaic radiator, which is just a giant radiator that radiates the heat being generated by the electrical power system on the S4 segment out to space. My job is to go down there on the bottom side of the truss, the nadir side of the truss. A variety of cinches and winches keep it in the compressed configuration. My job is to get those fully deployed, get them opened up, and get it configured so that it can be commanded into the deployed configuration."
DATE/EDT.......DD...HH...MM...EVENT 06/11/07 Mon 09:08 AM...02...13...30...STS crew wakeup Mon 09:38 AM...02...14...00...EV1/EV2 wakeup Mon 10:13 AM...02...14...35...Mission control: S3 activation begins Mon 10:18 AM...02...14...40...EVA-1: Crew lock 14.7 psi repress Mon 10:33 AM...02...14...55...EVA-1: Hygiene break Mon 11:08 AM...02...15...30...EVA-1: Crew lock depress to 10.2 psi Mon 11:38 AM...02...16...00...SSRMS S3/S4 install Mon 11:48 AM...02...16...10...EVA-1: Camp out EVA preps Mon 01:18 PM...02...17...40...EVA-1: Spacesuit purge Mon 01:33 PM...02...17...55...EVA-1: Spacesuit pre-breathe Mon 01:43 PM...02...18...05...S1-S3 Segment-to-segment bolting Mon 02:23 PM...02...18...45...SSRMS ungrapples S3/S4 Mon 02:23 PM...02...18...45...EVA-1: Crew lock depressurization Mon 02:38 PM...02...19...00...SSRMS to park position for EVA-1 Mon 02:58 PM...02...19...20...EVA-1: Airlock egress Mon 03:18 PM...02...19...40...SSRMS support Mon 03:18 PM...02...19...40...EVA-1: EV1: S1-S3 lower utility tray electrical connections Mon 03:38 PM...02...20...00...EVA-1: EV2: Release aft-fwd solar array blanket box restraints Mon 03:58 PM...02...20...20...EVA-1: EV1: S3 black box shroud removal Mon 03:58 PM...02...20...20...EVA-1: EV1: Keel pin rotate Mon 04:13 PM...02...20...35...ISS: Sokol suit pressure checks Mon 04:28 PM...02...20...50...EVA-1: EV1: S1-S3 upper utility tray electrical connections Mon 05:38 PM...02...22...00...EVA-1: EV2: Release radiator panel cinch/winch Mon 05:48 PM...02...22...10...EVA-1: EV1: Release 1A-3A beta gimbal restraint Mon 06:08 PM...02...22...30...EVA-1: EV2: Unstow aft SABB Mon 06:28 PM...02...22...50...EVA-1: EV2: Remove MLI insulation Mon 06:28 PM...02...22...50...EVA-1: EV1: Unstow forward SABB Mon 06:48 PM...02...23...10...EVA-1: EV1: Install SARJ drive motor 2 Mon 06:58 PM...02...23...20...EVA-1: EV2: Rigidize AJIS struts (4) Mon 07:38 PM...03...00...00...EVA-1: SARJ prep (locks) Mon 08:08 PM...03...00...30...Photo-voltaic radiator deploy Mon 08:38 PM...03...01...00...EVA-1: Cleanup and ingress Mon 09:23 PM...03...01...45...EVA-1: Airlock repressurization Mon 09:38 PM...03...02...00...Spacesuit servicing 06/12/07 Tue 12:38 AM...03...05...00...ISS crew sleep begins Tue 01:08 AM...03...05...30...STS crew sleep begins Tue 04:23 AM...03...08...45...Mission control: S4-1A mast deploy (1 bay) Tue 07:33 AM...03...11...55...Mission control: S4-3A mast deploy (1 bay)"Flight day four is really the big day where station is going to take on a new look," said Kelly Beck, lead space station flight director. "When the crew wakes up on flight day four, they're going to begin their robotics and EVA preparation activities. The airlock will be repressurized, that'll allow JR and Danny to get out, do their morning routine, grab some breakfast, go back inside and then they'll be assisted ... to get them suited up. In the meantime, while they're getting ready for their spacewalk, Bru (Archambault) and Suni will be performing their robotic operations to install the truss. "Bru and Suni will be taking the space station arm through a series of maneuvers to position the truss into the proper orientation for installation. Once they have that in the proper orientation, then Suni and Pat Forrester will operate the segment-to-segment attach system to permanently attach that module. The first step of that is operating a claw like mechanism on the S1 side of the interface and that claw will close around a capture bar on S3, bring the two segments together tightly so we can start the bolting sequence. Then Suni and Pat will do the bolting. "Once that's complete, Bru and Suni can ungrapple the station arm and maneuver it into a position to watch the EVA. By the time the truss is securely attached, the spacewalking crew will be ready and suited up. First thing that they'll be doing is mate the umbilical connections to provide power and commands to the components on the truss and also receive data from those components. The next thing they'll be doing is preparing the solar arrays for deploy. They'll first release the restraints so that the mast canisters, the circular canisters that house the masts, the central structural member, they'll deploy those into position and then they'll release the restraints on the boxes containing the solar array blankets and they'll swing those out into position in preparation for deploy the following day. "The crew will also release the restraints on the radiator so it can be deployed later on in the EVA," Beck said. "They will start the preparation tasks for the solar alpha rotary joint. They'll be repositioning four struts that provide additional structural integrity to maintain, to take the on orbit loads. They'll also be positioning one of the drive lock assemblies, this is the mechanism that rotates the joint and also locks the joint when it becomes operational. And they'll start to remove the launch locks. So they'll get a good head start getting the SARJ prepped for its operational state." Toward the end of the spacewalk, the astronauts inside the station will send commands to deploy the folding radiator needed to keep the S4 array's electronics cool during normal operation. The radiator measures 44 feet long and 12 feet wide.
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