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Caused because the GOES-12 satellite will be in Earth shadow, the presentation notes that the satellite will be unavailable between 12:15 A.M. through 1:45 A.M. EDT from August 23rd through 28th.<\/p>\n
Given that this period of time covers the extent of Discovery\u2019s launch window \u2013 although the 23rd has been all but ruled out due to processing timelines \u2013 the Space Flight Meteorology Group has indicated that the GOES-11 (West) satellite is capable of providing a \u201cnon-optimal\u201d oblique view of the Kennedy Space Center during the eclipse times for GOES-12.<\/p>\n
The next item of interest to gain attention by the MOD is the Boundary Layer Transition DTO Discovery will conduct during her re-entry at the end of the mission.<\/p>\n
![\"W1\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2009\/08\/W1.jpg\" "\\"W1\\"")
\u201cSecond flight of DTO will gather data during entry regarding the aerothermal effects caused by the boundary layer transitioning from laminar flow to turbulent flow at a high Mach number,\u201d notes the Mission Operations presentation.<\/p>\nSpaceflight
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This DTO was first performed on Discovery\u2019s previous flight (STS-119). However, there are several changes to the DTO for its second flight.<\/p>\n
For the second Boundary Layer Transition DTO, the protuberance height on a modified Thermal Protection System (TPS) tile on the underside of Discovery has been increased to 0.35 inches \u2013 enabling the Boundary Layer to be tripped at Mach 18.<\/p>\n
Furthermore, based on post-flight analysis from STS-119, a temperature-sensitive coating has been applied to two TPS tiles located downstream of the protuberance, the thermocouples have been relocated, and one downstream tile has been replaced with one that has a higher heat load capacity.<\/p>\n
New Operations:<\/p>\n
Debuting on Discovery for STS-128 is the OI-34 (Operational Increment number 34) software.<\/p>\n
\u201cEnhancements made to Backup Flight Software Heads Up Display to make performance more similar to PASS HUD,\u201d notes the Mission Operations FRR presentation.<\/p>\n
Additional enhancements made possible by the OI-34 software include a Bodyflap warning message on the HUD, enhanced runway overlays using \u201clanding site table data for correct length,\u201d HUD high g limit warnings, and deceleration command restoration.<\/p>\n
The remaining changes implemented include \u201cmemory efficiencies, minor DR fixes, removal of unused code, and documentation-only CRs.\u201d<\/p>\n
The previous software upgrade \u2013 OI-33 \u2013 included safety modifications for engine out scenarios, External Tank separation during a RTLS (Return To Landing Site) abort, and the orbiter\u2019s ability to return to Earth unmanned.<\/p>\n
See also:
\nOI-32 Upgrade:
\nhttp:\/\/www.nasaspaceflight.com\/2007\/10\/shuttle-discoverys-new-software-from-oi-32-to-windows-xp\/
\nOI-33 Upgrade:
\nhttp:\/\/www.nasaspaceflight.com\/2008\/10\/126-debut-oi-33-rco-ability\/<\/p>\n![\"W2\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2009\/08\/W2.jpg\" "\\"W2\\"")
Discovery will also debut the O2 crossover Valve Position indication as a result of a failure seen on STS-126 last year. <\/p>\n\u201cMO10W wiring modification provides position indication for system 1 & 2 crossover valves and simplifies pre-launch and on-orbit troubleshooting.\u201d<\/p>\n
The final Launch Commit Criteria modifications for this new wiring configuration were approved by the PRCB (Program Requirements Control Board) at the Noon Board on June 23, 2009.<\/p>\n
Also noted in the Mission Operations presentation under the \u201cnew procedures\u201d category is the Ammonia Tank Assembly removal and replacement (R&R) on the P1 truss.<\/p>\n
\u201cNH3 vent planned for FD2. ATA will be isolated from EATCS loop and on-orbit tests confirm the EATCS loop can function without the ATA,\u201d notes the FRR presentation.<\/p>\n
Venting of NH3 is required for this operation in order to reduce the pressure in the ATA tank to the Quick Disconnect line. The venting will prevent over-pressurization in the lines that can be caused by thermal changes. It will also reduce the risk of a leak \u2013 which is classed as a \u201ccatastrophic hazard\/flammability risk in PLB.\u201d<\/p>\n
The presentation also notes that if the venting operation should fail, \u201cone tank isolation valve will be opened to reduce over-pressurization.\u201d<\/p>\n
Also, the vent can be performed manually during an EVA (Spacewalk) if required.<\/p>\n
Previous Mission Anomalies:<\/p>\n
The main issues\/anomaly gaining note from the MOD relate to the previous MPLM flight \u2013 STS-126.<\/p>\n
Before STS-126, the ISS Program and ASI telemetry representatives removed the MPLM off-nominal condition values in an effort to save S-band bandwidth. However, they did not properly communicate the removal with ASI flight control team.<\/p>\n
As a result, \u201cMPLM Telemetry Parameters were noted as off-nominal and were unavailable in the ISS S-band stream during the STS-126 mission for the ASI (Agenzia Spaziale Italiana) flight control team.\u201d<\/p>\n
In response to this anomaly, NASA and ASI agreed to provide Caution and Warning \u201cevents\u201d to the ASI flight control team for the three remaining Shuttle MPLM flights \u2013 the first of which is STS-128.<\/p>\n
This will be accomplished by \u201cplacing a camera on the Caution and Warning display and displaying it in the MPLM area.\u201d<\/p>\n
In all, the MOD is ready to support STS-128 pending the completion of all standard and non-standard open work.<\/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":"
At last week\u2019s Space Shuttle Program (SSP) FRR, program managers discussed a wide range of topics, including Weather Satellite limitations, the Boundary Layer Transition DTO (Detailed Test Objective), several new operations that will be a part of STS-128 \u2013 including Discovery\u2019s debut of new flight software \u2013 as well as previous flight performance of the MPLM […]<\/p>\n","protected":false},"author":1,"featured_media":29972,"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":[3610,9205],"class_list":["post-41023","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-frr","tag-sts-128"],"acf":[],"_links":{"self":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/41023"}],"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=41023"}],"version-history":[{"count":0,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/41023\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media\/29972"}],"wp:attachment":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media?parent=41023"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/categories?post=41023"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/tags?post=41023"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}