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- STS-131 LIVE UPDATES<\/li>\n
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EOM+1 (End Of Mission Plus One Day) will include landing opportunties at the Dryden Flight Research Facility (DFRC) at the Edwards Air Force Base (EAFB), along with several KSC options \u2013 which will once again take in an overhead return over a large part of the United States.<\/p>\n
Interestingly, if Discovery is forced to land at Dryden \u2013 and thus spend around a week in California for ferry operations \u2013 this will delay the turnaround of STS-131\u2019s MPLM Leonardo, which is scheduled to be modified into a PMM for STS-133 \u2013 already under the constraint of a tight schedule.<\/p>\n
STS-133 is currently scheduled to be the last flight, although major delays are expected for the preceding STS-134 \u2013 due to its AMS-2 payload problems during ongoing testing \u2013 resulting in a major manifest meeting this week. Ultimately, managers always prefer to land the orbiters at KSC to avoid additional processing turnaround issues.<\/p>\n
STS-131 Specific Articles: http:\/\/www.nasaspaceflight.com\/tag\/sts-131\/<\/p>\n
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Discovery DLI Review:<\/p>\n
Discovery undocked from the International Space Station on Sunday, following a Docked Late Inspection (DLI) on the orbiter\u2019s Reinforced Carbon Carbon (RCC) and critical Thermal Protection System (TPS).<\/p>\n
![\"\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2010\/04\/A319.jpg\" "\\"A3\\"")
Thanks to the fine efforts of the Damage Assessment Team (DAT), Level I, Level II and the peer review of all the imagery taken via the Orbiter Boom Sensor System (OBSS) \u2013 and downlinked via ISS Ku-Band assets due to the unavailability of Discovery\u2019s own Ku system \u2013 was completed in an extremely prompt manner, clearing the orbiter for entry.<\/p>\n\u201cLESS\/RCC team cleared all late inspection regions of interest,\u201d noted the DAT presentation (L2) on what was an increase number of ROIs (Regions Of Interest) \u2013 higher than the four previous flights, potentially due to the difference between nominal and docked Late Inspection techniques.<\/p>\n
However, none of the ROIs were of any concern, which baseline imagery showing no change to the most obvious areas of \u201cdamage\u201d \u2013 all of which are cosmetic and minor.<\/p>\n
\u201cLevel 1 review by PRT completed at 7:30 pm (4-16) evening. Level 2 completed at 6:30 am (\u224823 hrs from start of data review). Final PRT Review completed at 9:15 am (4-17),\u201d added the presentation. \u201cNo ROI exhibited any damage characteristics. From all of the late inspection LDRI imagery. LESS PRT is GO for entry.\u201d<\/p>\n
STS-131 High Level Undocking Review:<\/p>\n
Discovery then enjoyed a nominal undocking, completing a one and a half lap flyaround of the ISS, prior to separation burns that increased the distance between the two spacecraft.<\/p>\n
![\"\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2010\/04\/A513.jpg\" "\\"A5\\"")
\u201cOrbiter performed the maneuver to the undocking attitude using VRCS (Vernier Reaction Control System) control. It was nominal,\u201d noted an expansive Mission Evaluation Room (MER) report (L2). \u201cAfter physical separation, the Orbiter DAP (Digital Auto Pilot) commanded 4 +pitch firings to stop the pitch rate from the spring pushoff. Single -X translation and +X translation pulses were commanded by the crew during this period.<\/p>\n\u201cThere was no issue with these firings. They are allowed within the procedures and are covered by the separation database used for pre-flight analysis.<\/p>\n
\u201cOrbit IGN&C performance was nominal on FD13. The Orbiter took attitude control with DAP A12\/AUTO\/VRCS at GMT 107\/11:33:23 and the maneuver to undock was initiated at GMT 107\/11:35:11. The maneuver took approximately 33 minutes and DAP B12 was selected at GMT 107\/12:08:20.<\/p>\n
\u201cThe DAP was moded to FREE at GMT 107\/12:19:56 to power up the Primary Reaction Jet Drivers (PRJDs). The DAP was moded back to AUTO at 107\/12:21:18. The DAP was moded to FREE at GMT 107\/12:49:26 for the undocking. Rate errors at FREE drift were -0.001 deg\/s Roll, +0.008 deg\/s Pitch, and +0.0008 deg\/s Yaw.<\/p>\n
\u201cPhysical separation occurred at GMT 107\/12:52:21. The flyaround began at GMT 107\/13:20:32 and was completed at 107\/14:13:20.\u201d<\/p>\n
The Rendezvous and Proximity Operations Program (RPOP) also reported a nominal undocking via the MER summary report.<\/p>\n
![\"\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2010\/04\/A417.jpg\" "\\"A4\\"")
\u201cThe RPOP team supported STS-131 rendezvous tool checkout procedure and undocking and separation flight phase on FD13 from the Mission Evaluation Room (MER) in Mission Control Center (MCC). The tool checkout was performed soon after hatch closure.\u201d<\/p>\n\u201cGround monitoring software indicated the Trajectory Control Sensor (TCS) was performing nominally and the crew reported tool checkout was successful. Undocking and separation was performed about two hours after hatch closure. Based on ground data and crew call-downs, RPOP performed as expected. TCS also appeared to perform nominally based on ground data.\u201d<\/p>\n
\u201cFlyaround was nominal. It began just outside the CG-CG range of 400 ft. A CG-CG range > 600 ft was reached prior to -RBAR crossing. Loads on US PV arrays were very low, due to the lack of Y firings,\u201d added ISS structures. \u201cPeak loads on any ISS hardware occurred on the Progress PV arrays for the vehicle on the DC1 nadir. The interaction equation results for these arrays were approximately 21 percent of the limit load constraint.\u201d<\/p>\n
Flight Day 14 Checkouts:<\/p>\n
As scheduled, Discovery\u2019s crew checked out the orbiter\u2019s Flight Control Surfaces (FCS) and Reaction Control Systems (RCS), while completing the Group C powerdown to conserve cyros in her Fuel Cells and cabin stows ahead of entry.<\/p>\n
Auxiliary Power Unit 1 (APU 1) was powered up to supply life to the hydraulic systems that will allow Discovery to transition from her spacecraft phase into that more accustomed to an aircraft, the checkouts were nominal.<\/p>\n
All of 38 primary thrusters were pulsed, twice, to check they were also in good working order ahead of their use for Discovery\u2019s dive back towards Earth. Again, no problems were reported.<\/p>\n
Thanks to a post undocking water dump, Discovery\u2019s life support systems are all in a nominal condition. The orbiter has plenty of water in stock and \u2013 unlike STS-129 \u2013 has no problems with her Waste Water System, which blocked during the final part of Atlantis\u2019 mission.<\/p>\n
\u201cAll Life Support Subsystems are working nominally. Life Support console working no issues,\u201d added MER status. \u201cTotal GN2 = 232.0 lbm Total Water = 594.5 lbm Total Waste Water = 15.1 percent (28.2 lbm).\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"
Shuttle Discovery and her seven member crew will spend another day on orbit, following the wave off of both Kennedy Space Center (KSC) landing opportunities due to poor weather. A Group C powerdown on the orbiter \u2013 conducted on Sunday \u2013 enabled the ability to remain in space through to at least Wednesday, with Discovery\u2019s […]<\/p>\n","protected":false},"author":1,"featured_media":29568,"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":[9184],"class_list":["post-40805","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-sts-131"],"acf":[],"_links":{"self":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/40805"}],"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=40805"}],"version-history":[{"count":0,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/40805\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media\/29568"}],"wp:attachment":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media?parent=40805"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/categories?post=40805"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/tags?post=40805"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}