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See Also<\/h4>\n\n- STS-119 LIVE UPDATES<\/li>\n
- L2 STS-119 Section<\/li>\n
- L2 STS-125 Section<\/li>\n
- Click here to Join L2<\/li>\n<\/ul>\n
As previously reported, Discovery\u2019s three FCVs are being removed, ahead of their replacement. Discovery is deemed to have three good spares for installation, although the challenge includes assurances of another three \u201cgood\u201d valves for Endeavour, due to her LON (Launch On Need) requirement in support of STS-119.<\/p>\n
\u201cResults of the investigation of the STS-126\/ULF2 MPS Flow Control Valve anomaly are expected to be a significant topic at the SSP Level II FRR,\u201d pre-empted the 8th Floor memo. \u201cThe valves from Atlantis\/OV104 and Endeavor\/OV105 (including the anomalous valve with cracked poppet) and three spare valves have been inspected.<\/p>\n
\u201cThe results indicate the failure was caused by high cycle fatigue. However, this poppet is not subjected to high number of cycles. Computational Flow Dynamics (CFD) analysis is being performed to better understand the environment as a potential source of the high cycle fatigue signatures.<\/p>\n
\u201cA specialized inspection technique is also being used to determine the relative age of the cracks observed during inspections to determine whether the cracks formed over time, which would support flight rationale for STS-119\/15A. Failure scenarios and associated risk assessments are also being evaluated to build flight rationale, which will be presented at the SSP FRR.\u201d<\/p>\n
The target date for installation of the spare valves on Discovery is February 2 \u2013 ten days before launch \u2013 with further work then required on resistance checks, pressurizing the system (mass spec), pull-in\/drop out voltage tests to simulate low-flow\/hi-flow, scan tests using break-out box, and engine flow thru tests on all 3 SSMEs.<\/p>\n
STS-119\u2019s mission next month will also carry some additional payload in the form of replacement hardware for what is confirmed to be failed hardware in the Urine Processor Assembly (UPA), which only recently arrived at the International Space Station on Endeavour\u2019s STS-126 mission.<\/p>\n
The new hardware \u2013 which required a large amount of troubleshooting during STS-126 \u2013 is vital for the proposed increase of crew size to six on the orbital outpost, which is still on track for May.<\/p>\n
\u201cThe crew and ground continues to work hard on ensuring that all the equipment required to enable transitioning to a 6 crew on orbit configuration in May,\u201d added the 8th Floor. \u201cAlthough there are still a number of activation and operation challenges, the community feels that we are still on track for a May start.<\/p>\n
\u201cChallenges include a potential hardware failure in the Distillation Assembly (DA) of the new Urine Processor Assembly (UPA). After a number of on orbit tests, the community has concluded that there is a failure in the hardware and therefore a spare is being prepared to fly on 15A (STS-119).\u201d<\/p>\n
Additional hardware related to water processing on the ISS will also hitch a ride on Discovery. The items will be stowed in the middeck of the orbiter.<\/p>\n
\u201cAdditionally, The Water Processor Assembly (WPA), which takes condensate water or urine from the UPA and converts it to usable potable and hygiene water, has also had some hiccups,\u201d the memo continued. \u201cAlthough it does operate, there have been some conditions resulting in shutdown that the team has been investigating.<\/p>\n
\u201cAlso, the Total Organic Carbon Analyzer (TOCA), which is used to determine whether sufficient carbon compounds have been removed from the processed water to allow human consumption, appears to have a potential hardware issue. Several components are being flown on 15A to allow possible repair of the device.<\/p>\n
\u201cFinally, although the Interim Resistive Exercise Device (IRED) is installed and in use, the team has expended a great deal of energy to install and activate the new Advanced Resistive Exercise Device (ARED). There have been a number of teething issues, but the community expects to have the new ARED operational in short order.\u201d<\/p>\n
![\"\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2009\/01\/a3101-300x152.jpg\")
Meanwhile, good news has been reported by the Canadian Space Agency (CSA) team on the health of Dextre, after engineers evaluated a potential failure mode in the SPDM Power Switching Init (PSU).<\/p>\n
The robot may have required a cable with diodes to be flown to the ISS via Discovery on STS-119, in order to protect against the potential of a reverse current. However, tests this week have shown the robot is in good shape \u2013 with contingencies available in the event of issues with the PSU during future robotic tasks.<\/p>\n
On January 20, all three elements of the Canadian robotics system on the ISS (collectively known as the Mobile Servicing System) were working together, noted the CSA.<\/p>\n
\u201cFrom its perch on the Mobile Base System, Canadarm2 successfully lifted Dextre off the ISS\u2019s Destiny lab, and held it overnight until further operations on Wednesday,\u201d noted the CSA. \u201cThis maneuver marks the first time ground controllers have moved Canadarm2 while carrying a payload at the end of the arm.\u201d<\/p>\n
L2 members<\/em><\/em>: All 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 Space Shuttle Program (SSP) Flight Readiness Review (FRR) concluded the key milestone meeting for the STS-119 mission, set to launch on February 12. The replacement of Discovery\u2019s Flow Control Valves (FCVs) is the one constraint to flight. STS-119 is also set to carry spares for the failed hardware in the Urine and Water Processing […]<\/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":[8854,9191,3610,233,9123],"class_list":["post-41209","post","type-post","status-publish","format-standard","hentry","category-news","tag-dextre","tag-fcv","tag-frr","tag-iss","tag-sts-119"],"acf":[],"_links":{"self":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/41209"}],"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=41209"}],"version-history":[{"count":0,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/41209\/revisions"}],"wp:attachment":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media?parent=41209"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/categories?post=41209"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/tags?post=41209"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
As previously reported, Discovery\u2019s three FCVs are being removed, ahead of their replacement. Discovery is deemed to have three good spares for installation, although the challenge includes assurances of another three \u201cgood\u201d valves for Endeavour, due to her LON (Launch On Need) requirement in support of STS-119.<\/p>\n
\u201cResults of the investigation of the STS-126\/ULF2 MPS Flow Control Valve anomaly are expected to be a significant topic at the SSP Level II FRR,\u201d pre-empted the 8th Floor memo. \u201cThe valves from Atlantis\/OV104 and Endeavor\/OV105 (including the anomalous valve with cracked poppet) and three spare valves have been inspected.<\/p>\n
\u201cThe results indicate the failure was caused by high cycle fatigue. However, this poppet is not subjected to high number of cycles. Computational Flow Dynamics (CFD) analysis is being performed to better understand the environment as a potential source of the high cycle fatigue signatures.<\/p>\n
\u201cA specialized inspection technique is also being used to determine the relative age of the cracks observed during inspections to determine whether the cracks formed over time, which would support flight rationale for STS-119\/15A. Failure scenarios and associated risk assessments are also being evaluated to build flight rationale, which will be presented at the SSP FRR.\u201d<\/p>\n
The target date for installation of the spare valves on Discovery is February 2 \u2013 ten days before launch \u2013 with further work then required on resistance checks, pressurizing the system (mass spec), pull-in\/drop out voltage tests to simulate low-flow\/hi-flow, scan tests using break-out box, and engine flow thru tests on all 3 SSMEs.<\/p>\n
STS-119\u2019s mission next month will also carry some additional payload in the form of replacement hardware for what is confirmed to be failed hardware in the Urine Processor Assembly (UPA), which only recently arrived at the International Space Station on Endeavour\u2019s STS-126 mission.<\/p>\n
The new hardware \u2013 which required a large amount of troubleshooting during STS-126 \u2013 is vital for the proposed increase of crew size to six on the orbital outpost, which is still on track for May.<\/p>\n
\u201cThe crew and ground continues to work hard on ensuring that all the equipment required to enable transitioning to a 6 crew on orbit configuration in May,\u201d added the 8th Floor. \u201cAlthough there are still a number of activation and operation challenges, the community feels that we are still on track for a May start.<\/p>\n
\u201cChallenges include a potential hardware failure in the Distillation Assembly (DA) of the new Urine Processor Assembly (UPA). After a number of on orbit tests, the community has concluded that there is a failure in the hardware and therefore a spare is being prepared to fly on 15A (STS-119).\u201d<\/p>\n
Additional hardware related to water processing on the ISS will also hitch a ride on Discovery. The items will be stowed in the middeck of the orbiter.<\/p>\n
\u201cAdditionally, The Water Processor Assembly (WPA), which takes condensate water or urine from the UPA and converts it to usable potable and hygiene water, has also had some hiccups,\u201d the memo continued. \u201cAlthough it does operate, there have been some conditions resulting in shutdown that the team has been investigating.<\/p>\n
\u201cAlso, the Total Organic Carbon Analyzer (TOCA), which is used to determine whether sufficient carbon compounds have been removed from the processed water to allow human consumption, appears to have a potential hardware issue. Several components are being flown on 15A to allow possible repair of the device.<\/p>\n
\u201cFinally, although the Interim Resistive Exercise Device (IRED) is installed and in use, the team has expended a great deal of energy to install and activate the new Advanced Resistive Exercise Device (ARED). There have been a number of teething issues, but the community expects to have the new ARED operational in short order.\u201d<\/p>\n
Meanwhile, good news has been reported by the Canadian Space Agency (CSA) team on the health of Dextre, after engineers evaluated a potential failure mode in the SPDM Power Switching Init (PSU).<\/p>\n
The robot may have required a cable with diodes to be flown to the ISS via Discovery on STS-119, in order to protect against the potential of a reverse current. However, tests this week have shown the robot is in good shape \u2013 with contingencies available in the event of issues with the PSU during future robotic tasks.<\/p>\n
On January 20, all three elements of the Canadian robotics system on the ISS (collectively known as the Mobile Servicing System) were working together, noted the CSA.<\/p>\n
\u201cFrom its perch on the Mobile Base System, Canadarm2 successfully lifted Dextre off the ISS\u2019s Destiny lab, and held it overnight until further operations on Wednesday,\u201d noted the CSA. \u201cThis maneuver marks the first time ground controllers have moved Canadarm2 while carrying a payload at the end of the arm.\u201d<\/p>\n
L2 members<\/em><\/em>: All 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 Space Shuttle Program (SSP) Flight Readiness Review (FRR) concluded the key milestone meeting for the STS-119 mission, set to launch on February 12. The replacement of Discovery\u2019s Flow Control Valves (FCVs) is the one constraint to flight. STS-119 is also set to carry spares for the failed hardware in the Urine and Water Processing […]<\/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":[8854,9191,3610,233,9123],"class_list":["post-41209","post","type-post","status-publish","format-standard","hentry","category-news","tag-dextre","tag-fcv","tag-frr","tag-iss","tag-sts-119"],"acf":[],"_links":{"self":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/41209"}],"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=41209"}],"version-history":[{"count":0,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/41209\/revisions"}],"wp:attachment":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media?parent=41209"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/categories?post=41209"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/tags?post=41209"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}