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\u201cPotable water servicing is complete to date. ET Umbilical door closeout functional test was completed. MSBLS (Microwave Scan Beam Landing System) magnetron test and orbiter power redundancy test (in work). Aft and Forward closeouts for rollover are in work and will continue through the week,\u201d noted the NASA Test Director (NTD) processing update (L2).<\/p>\n
\u201cWeekend Work: Structures face sheet removal, potting, doubler installation work, and TPS (Thermal Protection System) work.\u201d<\/p>\n
The latest IPR \u2013 a known condition \u2013 remains under evaluation, but holds no constraint for the upcoming rollover to the VAB.<\/p>\n
\u201cNew IPR-0038: During the Vac-Ion pump run, the H2 tank 4 vacuum signal exhibited dropouts. Dropouts of ~25 percent occurred 3 separate times during the 4 hour run time with the longest lasting 58 seconds,\u201d added the NTD update.<\/p>\n
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\u201cPump down times and final vacuum levels were consistent with past performance and it is not suspected that pump operation is the cause of the dropouts in output signal. Currently, this is an acceptable condition for rollout, but will continue to be evaluated. Constraint: Final power down.\u201d<\/p>\n
STS-133 Specific Articles: http:\/\/www.nasaspaceflight.com\/tag\/sts-133\/<\/p>\n
![\"\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2010\/08\/A3101.jpg\" "\\"A310\\"")
Good news has been reported by the NTD and KSC Ground Operations on a number of recent issues that have been in-work over the past few weeks, with confirmation the problem with the misbehaving Valve Position Indicator (VPI) on the O2 cross-over valve system has been closed \u2013 as was expected.<\/p>\n\u201cIPR-0035 O2 cross-over valve update: The agreement is to fly-as-is for unrestricted use,\u201d noted the NTD update. \u201cNo deviation will be required.\u201d<\/p>\n
Engineers have also completed the changeount of the C\/L (Centerline) latch 1-4 Power Drive Unit (PDU) \u2013 which stalled when moving to the latched position during a cycle of the PLBDs. The failed PDU was replaced by a recently refurbished unit from the NSLD (NASA Shuttle Logistics Depot).<\/p>\n
\u201cThe RH PLBD Centerline Latch Power Drive Unit (PDU) retest was successfully completed,\u201d added the NTD, allowing for the next step to complete the final closure of the doors ahead of rollover. They are next scheduled to be opened at the pad when Discovery receives her STS-133 payload.<\/p>\n
![\"\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2010\/08\/A451.jpg\" "\\"A45\\"")
One final issue had to be worked to allow for the PLBDs closure, however \u2013 relating to the final stowage of the Ku-band antenna.<\/p>\nThe Ku-band system has been undergoing troubleshooting for some time inside the OPF, as engineers worked on pinpointing the exact cause of the system failing the angle rate\/pitch rate portion of a recent self test. The system also suffered from issues with Discovery during STS-131.<\/p>\n
As suspected, the fault was tracked to one of the system\u2019s two Electronics Assemblies (EA), and encouragingly this issue is only occurring in its self test circuitry.<\/p>\n
With a successful radar tracking test \u2013 cleverly conducted by bouncing a signal off the OPF\u2019s ceiling \u2013 the system will receive a one-flight waiver to clear the constraint.<\/p>\n
![\"\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2010\/08\/A5411.jpg\" "\\"A541\\"")
With Discovery\u2019s STS-133 flight set to be her last, it is unlikely any more work will be conducted on this fault, unless the hardware is required as a donation for one of her sister orbiters.<\/p>\n\u201cIPR-0037 (Ku-Band Failed Self-test) update: The Ku-Band (team) has come to the conclusion that the failure is isolated to LRU (Line Replaceable Unit) EA-1 Self-test circuitry only,\u201d the NTD reported. \u201cThe system has nominally tracked a radar return off the ceiling in the OPF.<\/p>\n
\u201cPending a successful test of the COMM tracking loop, the (team) has agreed to upgrade this IPR to a PR (Problem Report) against EA-1 and defer one flight. Ku Band was deployed and additional troubleshooting was performed. Tracking in Comm mode was nominal. Final Self tests are complete. Results are being analyzed.\u201d<\/p>\n
This allowed for the final stowage of the Ku-band system, soon followed by PLBD closure for rollover.<\/p>\n
\u201cHad an ORMR with Orbiter on Friday. Have a few items in work: Have the Ku-Band Failed EA1 Self-test. Have a waiver going forward to the Daily prior to the Program Rollout Review,\u201d noted the Orbiter Project Office (OPO) at the Johnson Space Center (JSC) on the latest Shuttle Standup\/Integration report (L2).<\/p>\n
\u201cFinal Ku band antenna stow and PLBD closure for VAB rollover was completed. The Zero-G fixture and strongback have been removed.\u201d<\/p>\n
UPDATE: Managers have decided to reopen Discovery\u2019s PLBDs to allow for the installation of a container holding 30,000 STS-133 mission patches. The container is being housed on the Orbiter Docking System (ODS) support structure. Engineers claim the late call won\u2019t delay the rollover date at this time.<\/p>\n","protected":false},"excerpt":{"rendered":"
Only one waiver will be carried forward into Discovery\u2019s upcoming Orbiter Rollover\/Mate Review (ORMR) \u2013 relating to the Ku-band system \u2013 as the veteran orbiter edges closer to departure from her Orbiter Processing Facility (OPF-3). Discovery remains on track for a September 8 rollover to the Vehicle Assembly Building (VAB) for mating with her External Tank (ET-137). […]<\/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":[9051],"class_list":["post-40682","post","type-post","status-publish","format-standard","hentry","category-news","tag-sts-133"],"acf":[],"_links":{"self":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/40682"}],"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=40682"}],"version-history":[{"count":0,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/40682\/revisions"}],"wp:attachment":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media?parent=40682"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/categories?post=40682"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/tags?post=40682"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}