**The most comprehensive collection of STS-117 onwards related presentions and mission documentation are <\/em>available to download on L2<\/em> <\/em>**<\/em><\/p>\n **LIVE news updates on Atlantis STS-117 PAD Flow**<\/em><\/p>\n **LIVE news updates on Endeavour STS-118 (LON-318) Processing**<\/em><\/p>\n **LIVE news updates on Discovery STS-122 (LON-322) Processing**<\/em><\/p>\n <\/font>Notes and Presentations, including: The Feb 15 YERO Solution \u2013 PRCB. Year-End Roll-Over (YERO) MCC New Year\u2019s Eve Test \u2013 Dec 21. PRCB: STS-116 Year End Roll-over (YERO) Options (Nov 2). <\/em>STS-116 YERO (Year End problem) outline and troubleshoot plan \u2013 available to download on L2.<\/em><\/font><\/p>\n Spaceflight news subscription (adsbygoogle = window.adsbygoogle || []).push({});<\/p>\n YERO is a problem that was first highlighted when Discovery\u2019s STS-116 launch window was restricted to launching before the mission could overlap the change of year. <\/font><\/p>\n In the end, Discovery arrived home before Christmas, moving the focus to any mission that may occur at the end of 2007. <\/font><\/p>\n The YERO problem relates to the shuttle orbiter\u2019s computers needing to reset through a change of year, which could cause a glitch on orbit.<\/p>\n While a contingency was already in place \u2013 involving the orbiter remaining docked to the International Space Station (ISS) during a YERO event \u2013 a final solution was requested by shuttle manager Wayne Hale. <\/font><\/p>\n \u2018The shuttle computers, when they were originally programmed \u2013 the basic operating system was built back in the 1970s \u2013 it was not envisioned that we would fly across the end of the year, so we didn\u2019t handle it very well,\u2019 noted Hale during the pre-STS-117 flight briefing. <\/font><\/p>\n \u2018We\u2019re making some changes to the way the software works, which will be fairly simple and easy. So if we need to at the end of this year, fly across the end of the year, we will be able to do that. <\/font><\/p>\n \u2018We will have some restrictions on the ground software on the ground at the Kennedy Space Center by way of the launch capability, which will restrict us from launching literally on New Year\u2019s Eve. So there\u2019s probably a day or so that we would not launch at the end of the year.\u2019 <\/font><\/p>\n While not speaking of the actual solution, Hale was speaking just a few hours before being shown the presentation that YERO was becoming a closed action, noted as \u2018Approve proposed YERO solution and operational concept. Close all parts of action.\u2019<\/font><\/p>\n The summary of the solution shows two main elements to ensuring the orbiter won\u2019t be affected by the change of year, involving a recycling of ground systems, and a \u2018YERO Reset\u2019 on the orbiter, with modified software to allow a reset to GMT Day 001 during the event.<\/p>\n \u2018The Integrated solution that best satisfies goals and objectives is to force to entire system to roll over to GMT day 001,\u2019 noted the presentation. \u2018MTU (Master Timing Unit) to day 366 in the event of a leap year.\u2019<\/p>\n \u2018Preflight: KSC will perform PASS GPC IPL (orbiter software) and recycle the Firing Room. In-flight: Flight Software will be modified to enable YERO reset to rollover to GMT Day 001. Orbiter will perform YERO Reset and MCC (Mission Control Center) will perform YERO recycle.\u2019<\/font><\/p>\n On the current schedule, Endeavour\u2019s STS-123 is the nearest launch to the end of 2007 \u2013 although that flight is widely expected \u2013 and unofficially set \u2013 to move into 2008. With natural stretch in the manifest, it is likely STS-122 with Discovery will head towards the end of 2007, making this the first potential test of the new YERO solution.<\/p>\n This was touched upon in the document, with STS-122 targeted for the YERO software modification, in readiness for this flight requiring the capability, noting in the presentation: <\/b>\u2018Approve \u2013 to implement YERO Reset capability in the Flight Software for STS-122.\u2019 <\/p>\n While there is large confidence, noted throughout the presentation, that the plans outlined are the solution to YERO, further testing will be carried out over the year, with the likelihood of a simulation of a YERO event being carried out, following a previous simulation being moved from 2006\u2019s New Year\u2019s Eve into 2007.<\/font><\/p>\n Testing is also likely to be carried out at KSC, with a number of elements affecting launch operations, especially in the event of a scrub.<\/p>\n \u2018In the event of a launch scrub, YERO re-sync procedures cannot be executed prior to ET (External Tank) drain, boiloff and tank inert (scrub plus 24 hours),\u2019 added the presentation. \u2018YERO also impacts specific scrub turnaround timelines due to complications with scheduling YERO re-sync around critical\/hazardous operations.\u2019<\/font><\/p>\n <\/font><\/p>\n The YERO plan may actually remain unused if all of the remaining shuttle missions launch away the small window that is affected. However, having this plan in place at least adds a number of options, should NASA require them.<\/p>\n **INFINITY: 10 minute STS MUSIC VIDEO**<\/font><\/em><\/font> \u2013 **NASASpaceflight.com Job Opportunities**<\/em><\/font> <\/font><\/em><\/p><\/p>\n","protected":false},"excerpt":{"rendered":" Shuttle orbiters can now enjoy a happy New Year\u2019s Eve on orbit, following the recommendation to implement a YERO (Year End Rollover) solution that was recently designed by NASA engineers. The recommendation, which was presented in the form of a 45 page presentation to the all-powerful PRCB (Program Requirements Control Board), involves the implementation of […]<\/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":[],"class_list":["post-41793","post","type-post","status-publish","format-standard","hentry","category-news"],"acf":[],"_links":{"self":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/41793"}],"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=41793"}],"version-history":[{"count":0,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/41793\/revisions"}],"wp:attachment":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media?parent=41793"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/categories?post=41793"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/tags?post=41793"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}<\/font>**Ride home through the fire and plasma of re-entry with Atlantis on STS-115 \u2013 And now also with Discovery on STS-116 \u2013 TWO Stunning high quality 2hr, 355mb videos \u2013 from deorbit burn to post landing**<\/font><\/p>\n
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