![\"a230\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2009\/02\/a230.jpg\" "\\"a230\\"")
And future operations via use of the inner race ring on the SARJ, is deemed as capable of operation throughout the lifetime of the Station, in tandem with a mitigation plan involving the outer race ring.<\/p>\nThe work conducted by the STS-126 on the International Space Station\u2019s Solar Alpha Rotary Joints (SARJs) continues to reap rewards, following the latest positive status update to NASA managers. Meanwhile, Flight Directors have given a status overview of the work required to ensure they are ready for a potential launch of STS-119 in March.<\/p>\n<\/p>\n
NASA have continued to build plans to solve the SARJ issue on the Station \u2013 centering around an ambitious plan to replace the race ring on the starboard hardware that rotates solar arrays to track the sun, by installing SARJ XL on one of the 2010 shuttle flights.<\/p>\n
Several flights \u2013 depending on requirements \u2013 will have the additional EVA tasks of cleaning and lubing the starboard SARJ. However, downstream plans continue to be modified, via the positive results gained after STS-126\u2019s activities.<\/p>\n
\u201cAfter the STS-126 crew cleaned and lubricated the stbd SARJ, even though the race ring is damaged, the current required to rotate the joint was much lower than previously required,\u201d noted an 8th Floor News update to MOD staff, acquired by L2.<\/p>\n
\u201cBecause of this situation, there is higher confidence that this inboard race ring will be available for future operations.\u201d<\/p>\n
And future operations via use of the inner race ring on the SARJ, is deemed as capable of operation throughout the lifetime of the Station, in tandem with a mitigation plan involving the outer race ring.<\/p>\n
\u201cLifetime analyses indicate that the inner race ring structure is good for the life of the Program. However, since the ring is damaged and may contribute to a somewhat higher degradation of the rolling equipment attached to the ring.<\/p>\n
Spaceflight (adsbygoogle = window.adsbygoogle || []).push({});<\/p>\n \u201cThe Program is seriously considering modifying the Stbd SARJ to provide a full redundant option where the joint can be rotated using the outer race ring.<\/p>\n \u201cThis would open up the option to operate the Stbd SARJ using the outboard race ring with the inboard race ring used as backup. This would require moving both of the Rotary Joint Motor Controllers (RJMC) outboard of the rotating joint.\u201d<\/p>\n To enable this plan, an EVA task would be required on a future flight \u2013 or during an Expedition EVA \u2013 in order to create an installation location for the a second RJMC.<\/p>\n \u201cThe proposed solution includes developing two new interface boxes which would be installed at the current RJMC inboard location,\u201d added the update. \u201cThis would provide a means for the S3 MDM to acquire joint resolver data from the inside of the rotary joint.\u201d<\/p>\n It is not yet know if this would negate the need to fly SARJ XL to the station.<\/p>\n STS-119:<\/p>\n Meanwhile, when next orbiter due to arrive at the orbital outpost remains in the balance, as managers and engineers push forward on creating flight rationale for the Flow Control Valves (FCVs) in order to launch around March 12, just a few days prior to the Soyuz cut out.<\/p>\n Click here for NASASpaceflight.com articles on the FCV issue since STS-126.<\/p>\n Confidence is high that an engineering solution via testing will result in flight rationale being accepted at next month\u2019s latest Flight Readiness Review (FRR). However, all elements that support the mission are having to work along the fluctuating timeline.<\/p>\n \u201cAs you all know, the Space Shuttle Program and our partners are working hard to develop a plan to go forward toward a launch,\u201d noted Kwatsi Alibaruho from the Flight Director Office to MOD staff.<\/p>\n \u201cThat plan is coming together nicely, and our Shuttle Program Manager has been doing a great job articulating the status of the development of that plan to the community and to management as we progress.<\/p>\n \u201cOfficially, a launch date has not been set for STS-119 \/ ISS-15A; however, it\u2019s obvious from the press releases and other information that folks are working toward a March 12, 2009 launch target.<\/p>\n \u201cThere is still a great deal of open work to close out before we can fix a launch target that everyone has high confidence in. There will be management reviews next week to assess our capability to meet March 12th or subsequent targets.<\/p>\n \u201cBecause so much of our work requires a significant lead time of several days to complete, we must be prepared to support our nearest possible launch target.\u201d<\/p>\n Additional work required for the latest NET (No Earlier Than) launch date includes a switch from a Descending to Ascending Node landing.<\/p>\n The Ascending node entry path is usually preferred as it involves the orbiter return to track mainly over water, whereas a descending node entries occur much later in the flight day, and crosses over the heartland of the United States.<\/p>\n \u201cI want the team to prepare for a March 12, 2009 launch. I know we have timeline work that needs to begin right away because for a March 12th launch opportunity, we will be landing on an Ascending Node, versus the Descending Landing we were doing for a 2\/27\/09 launch opportunity,\u201d added Mr Alibaruho.<\/p>\n \u201cI know there are also ISS Power, Thermal, and Attitude analyses that must begin at this time. Please proceed.<\/p>\n \u201cIn summary, that work that we must do to prepare for a 3\/12\/09 launch, we should do. If there is any work that can be deferred until the management reviews next week, I recommend you defer.\u201d<\/p>\n L2 members<\/em><\/em>: Documentation \u2013 from which the above article has quoted snippets \u2013 is available in full in the related L2 sections, now over 4000 gbs in size.<\/em><\/em><\/p>\n","protected":false},"excerpt":{"rendered":" The work conducted by the STS-126 on the International Space Station\u2019s Solar Alpha Rotary Joints (SARJs) continues to reap rewards, following the latest positive status update to NASA managers. Meanwhile, Flight Directors have given a status overview of the work required to ensure they are ready for a potential launch of STS-119 in March. NASA […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[2],"tags":[233,9193,9123],"class_list":["post-41177","post","type-post","status-publish","format-standard","hentry","category-news","tag-iss","tag-sarj","tag-sts-119"],"acf":[],"_links":{"self":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/41177"}],"collection":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/comments?post=41177"}],"version-history":[{"count":0,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/41177\/revisions"}],"wp:attachment":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media?parent=41177"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/categories?post=41177"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/tags?post=41177"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}See Also<\/h4>\n
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