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#340 by JimO on 04 Aug, 2010 15:29
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....today's NBL run is being done by astronauts Robert Satcher and Rick Sturckow.
When did they get assigned to ISS Expedition crews? I must have missed it.
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#341 by Solar_OPS on 04 Aug, 2010 15:29
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Sounds like the Big 14 list is on the way
And thanks to James Oberg....
What were the PM failure’s impacts on station research?
MELFI 1 had to be shut down because we lost Low Temp Loop capability in the JEM. The crew transferred all samples to MELFI 2 in US Destiny Lab. No science lost.
Express Rack 4 in Japanese Experiment Module “Kibo” was turned off because JAXA lost smoke detection capability for JEM Express Racks. No science loss here as the rack was only on to power a SAMS sensor at the time.
JAXA SEDA-AP and SMILES external payloads had to powered down to standby mode and are currently not collecting science data.
Many planned payload operations (MDCA/Flex experiment maintenance [CIR Rack], SPHERES, VO2Max) were cancelled this week to make room for EVA preparation tasks. Crew time off between and following EVAs will result in additional postponements.
In general, many racks and experiments can’t be activated because either crew time or other resources are not available.
Thanks Chris and James!
To complete the list of science losses we can add for the European side on Columbus at least:
- cancellation of an ERB2 run;
- DOSIS activities cancelled;
- loss of a big part of the actual Sun Visibility Window for SOLAR for the planned solar spectral measurements, since SOLAR had to be put in Survival Mode (payload off with survival heaters only).
Cheers,
Denis -
#342 by psloss on 04 Aug, 2010 15:32
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The last I heard was that the STS-133 EV crew was going to do this run, but that may have been when the plan was for this second run to be done yesterday. This may be noted elsewhere, though; I haven't checked the other status update places in a bit.....today's NBL run is being done by astronauts Robert Satcher and Rick Sturckow.
When did they get assigned to ISS Expedition crews? I must have missed it.
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#343 by orbiter62995 on 04 Aug, 2010 16:41
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Quick question – looking for further details on the two EVAs targeted to fix the PM and RPCM.
What are the exact procedures, and who's flying the arm? MCC–H, correct? -
#344 by DaveS on 04 Aug, 2010 16:57
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Quick question – looking for further details on the two EVAs targeted to fix the PM and RPCM.
Shannon Walker will be the SSRMS operator while Caldwell-Dyson and Wheels are the EVs.
What are the exact procedures, and who's flying the arm? MCC–H, correct? -
#345 by orbiter62995 on 04 Aug, 2010 18:00
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Thanks.
When will the PDGF be installed? Next set of stage EVAs?
Who's scheduled to do those for Expedition 25? -
#346 by rdale on 04 Aug, 2010 18:51
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No real changes to plan. Sent up EVA pics & robo instructions today.
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#347 by JimO on 04 Aug, 2010 19:08
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After the presser yesterday I was told that the crew has a practice electrical/ammonia connect/disconnect panel on ISS for QD training in gloves, so natch I asked for pictures. Nobody at JSC can find any. Does this subject jog any memories here? Thanks!
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#348 by John44 on 04 Aug, 2010 20:30
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Today's EVA Training in the Neutral Buoyancy Laboratory (NBL) - August 4
http://www.space-multimedia.nl.eu.org/index.php?option=com_content&view=article&id=6101 -
#349 by Space Pete on 04 Aug, 2010 22:54
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From NASA's Main ISS Webpage:
Crew Prepares for Spacewalks.
www.nasa.gov/multimedia/videogallery/index.html?collection_id=14555&media_id=17015771
Video Above: Astronauts Robert Satcher Jr. and Rick Sturckow conduct an underwater practice spacewalk session at Johnson Space Center’s Neutral Buoyancy Laboratory. The session was used to help International Space Station team members identify challenges that will need to be addressed when Expedition 24 astronauts Doug Wheelock and Tracy Caldwell Dyson perform the first of two planned spacewalks to replace a failed ammonia pump module. Credit: NASA TV
Spacewalk preparations continue to preoccupy the Expedition 24 crew aboard the International Space Station as it gets ready to conduct a pair of spacewalks aimed at replacing a failed ammonia pump module. The pump failed Saturday night after a spike in electrical current tripped a circuit breaker. When the 780-pound pump failed, it shut down half of the station’s cooling system.
Read more about the cooling loop loss:
www.nasa.gov/mission_pages/station/main/stationstable_080110.html
Flight Engineers Doug Wheelock and Tracy Caldwell Dyson are scheduled to start the first spacewalk at 6:55 AM EDT Friday to unbolt and remove the failed pump module, and install the spare. NASA TV coverage will begin at 6 AM.
Wheelock, who will be designated as EV1, or extravehicular crew member 1, wearing the spacesuit bearing the red stripes, will be making the fourth spacewalk of his career. Caldwell Dyson, designated as EV2, wearing the unmarked spacesuit, will be making her first spacewalk.
The second spacewalk to hook up a variety of electrical and fluid connections for the new pump module is targeted for Monday.
Wheelock and Caldwell Dyson originally were scheduled to perform a spacewalk to outfit the Russian Zarya module for future robotics work and prepare the station for the installation of a new U.S. permanent multipurpose module. However, because of the importance of restoring redundancy to the station's cooling and power systems, the two new spacewalks will be dedicated to the pump module replacement.
Wednesday aboard the station, Wheelock, Caldwell Dyson and Flight Engineer Shannon Walker participated in conferences with Mission Control to review spacewalk procedures.
Meanwhile back on Earth, fellow astronauts Robert Satcher Jr. and Rick Sturckow were underwater, practicing the spacewalking tasks in the Johnson Space Center’s Neutral Buoyancy Laboratory (NBL). Astronauts Cady Coleman and Suni Williams spent Monday afternoon in the NBL to help prepare for the spacewalks as well.
View video of Wednesday spacewalk practice session:
www.nasa.gov/multimedia/videogallery/index.html?collection_id=14555&media_id=17015771
View video of Monday spacewalk practice session:
www.nasa.gov/multimedia/videogallery/index.html?media_id=16949182
Robotics experts are continuing to refine the procedures that will be used by Flight Engineer Shannon Walker to guide the station’s robotic arm, Canadarm2, as she moves Wheelock into position to swap the failed unit with a spare unit currently stored on External Stowage Platform 2. That spare parts carrier is attached to the Quest airlock that Wheelock and Caldwell Dyson will use to exit and reenter the station.
The station's Mobile Transporter was commanded to move to the Starboard 1 truss on Tuesday. With the Mobile Transporter in position, the ground team will be able to gather additional data to confirm power resources are sufficient for Canadarm2 to support the spacewalk.
Each pump module weighs 780 pounds and is 5 ½ feet long (69 inches) by 4 feet wide (50 inches), and is 3 feet tall (36 inches). The spacewalkers will need to disconnect and reconnect five electrical connectors, four fluid quick-disconnect devices, one fixed grapple bar and four bolts. The spare pump module that will be used to replace the failed unit was delivered to the station on the STS-121/Utilization Logistics Flight-1 mission in July 2006.
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From ISS On-Orbit Status Report for 04/08/2010:
Loop A PM Update:
Yesterday, a second test of the Pump Module was performed by the ground. The intent was to close the RPC (Remote Power Controller) that powers the PM and send a "bump start" command to the PM (the "bump start" commands the pump on for 10 seconds). The RPC was expected to trip when the command was sent; however, it tripped before that, immediately as it was being closed (powered on). The implications of this test result are under discussion.
MT & SSRMS EVA Preparation:
The MT was moved on its rails to WS-2 (Worksite-2) yesterday for supporting the EVAs. Manual mode had to be used for the MT translation UMA (Umbilical Mechanism Assembly) mating operations due to the current power limitations. No issues were encountered in manual mode. Also in preparation for the EVAs, the SSRMS was walked off from MBS PDGF-3 to PDGF-1. -
#350 by orbiter62995 on 05 Aug, 2010 00:18
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To answer my own question, NASA's basic summary of the PM failure (http://www.nasa.gov/mission_pages/station/main/stationstable_080110.html) states that the PDGF installation sequence will occur on a third Expedition 24 Stage EVA with Wheels and Caldwell-Dyson as well, following planned parameters that were supposed to be undergone this Thursday.
So CMG-1 is back in service, as I understand it – I'm sure it's been stated already but I've been offline for awhile. -
#351 by psloss on 05 Aug, 2010 00:39
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To answer my own question, NASA's basic summary of the PM failure (http://www.nasa.gov/mission_pages/station/main/stationstable_080110.html) states that the PDGF installation sequence will occur on a third Expedition 24 Stage EVA with Wheels and Caldwell-Dyson as well, following planned parameters that were supposed to be undergone this Thursday.
Actually, it just says those tasks will be deferred to a later date. Whether that's Expedition 24 or not was to-be-determined. That may not be assessed until after the cooling loop is recovered.
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#352 by erioladastra on 05 Aug, 2010 01:37
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After the presser yesterday I was told that the crew has a practice electrical/ammonia connect/disconnect panel on ISS for QD training in gloves, so natch I asked for pictures. Nobody at JSC can find any. Does this subject jog any memories here? Thanks!
Definitely exists, can't recall any pictures though. -
#353 by DwightM on 05 Aug, 2010 03:48
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Do they have to be assigned to a crew to use the NBL? With only a couple of shuttle missions left, maybe there was room in the schedule to use who was available & qualified to make a run?
The last I heard was that the STS-133 EV crew was going to do this run, but that may have been when the plan was for this second run to be done yesterday. This may be noted elsewhere, though; I haven't checked the other status update places in a bit.....today's NBL run is being done by astronauts Robert Satcher and Rick Sturckow.
When did they get assigned to ISS Expedition crews? I must have missed it.
Just asking. -
#354 by JimO on 05 Aug, 2010 04:48
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Do they have to be assigned to a crew to use the NBL? With only a couple of shuttle missions left, maybe there was room in the schedule to use who was available & qualified to make a run?
Odd to see a shuttle CDR as an EVA-trained crewmember, is all. Not so odd, if he were an ISS crewmember. -
#355 by Chris Bergin on 05 Aug, 2010 12:47
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Quote
Flight Engineers Doug Wheelock and Tracy Caldwell Dyson are scheduled to start the first spacewalk at 6:55 AM EDT Friday to unbolt and remove the failed pump module, and install the spare. NASA TV coverage will begin at 6 AM.
We'll start a dedicated thread for this either late tonight or early tomorrow. -
#356 by psloss on 05 Aug, 2010 15:16
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PAO Kyle Herring announcing that the first EVA has been delayed 24 hours to Saturday morning (Houston time). This allows more time on the ground to refine the procedures and timeline.
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#357 by dsmillman on 05 Aug, 2010 15:16
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It was just announced during ISS coverage that the first EVA has been delayed until Saturday Aug. 7.
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#358 by psloss on 05 Aug, 2010 15:21
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Capcom now calling up to the crew with some words on the overall timeline, including shifting the schedule to the right.
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#359 by dsmillman on 05 Aug, 2010 15:35
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During the ISS coverage it was just mentioned that the second EVA will be on Wednesday August 11.
