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Spaceflight L2 \u2013 breaking news, like this, as it happens, to your inbox.<\/font><\/em><\/p>\nSuch consequences are obvious. A failure of an attach strut would ultimatly lead to a loss of the vehicle. There are no abort options available during the roll program stage of the ascent.<\/font><\/p>\n
Importantly, the issues raised shouldn\u2019t have any impact to the busy Shuttle manifest, with the \u2018u<\/font>se of controlled integrated hazard approach\u2019 being \u2018adequate\u2019 \u2013 while the document added such an approach to evaluations is suitable \u2018only for the short term.\u2019 It\u2019ll take 18 months, and \u2018in excess of $100 million,\u2019 to fully complete the certification process.<\/font><\/font><\/p>\n Little is said on the mechanical information of strut that links the SRBs to the External Tank, although the data that has raised the concern was not expected, as \u2018the flight was reasonably nominal.\u2019<\/p>\n However, one consistent pattern in the document dismisses any structural issue with the strut itself, as it concentrates almost exclusively on the environment surrounding the Shuttle\u2019s roll program. This is backed up by \u2018SE&I determined that wind dispersions should be added to the roll manoeuvre cases,\u2019 as another element of recommendation.<\/p>\n The new data was gained from wind tunnel testing \u2013 although no mention is made on when these tests were conducted, or if they have resulted from on-going wind tunnel tests on the ET modifications. However, the new data is a result of \u2018an expanded aero database\u2019.<\/font><\/p>\n \u2018As the vehicle is moving slowly during roll,\u2019 noted the document, \u2018winds of moderate magnitude can cause relatively large alpha\/beta excursions.\u2019 The new data also identified that \u2018wing stall was identified at an alpha of 19 deg,\u2019 thus concluding that \u2018f<\/font>lights will be restricted to max alpha of 19 deg to preclude this condition.\u2019<\/font><\/font><\/p>\n Space tourism guides (adsbygoogle = window.adsbygoogle || []).push({});<\/p>\n Another addition, noted under the header \u2018Description of Roll Manoeuvre Changes,\u2019 claimed that \u2018<\/font>Trajectory constraints (i.e., Orbiter q-planes) have been extended down from Mach 0.6 to Mach 0.2. Constraints are based upon estimated capabilities of Orbiter as described by load indicators.\u2019<\/p>\n <\/font> <\/p>\n While the tone of the document at times is decidedly reluctant to recommend anything other than full re-certification, it concedes that \u2018this process is best possible short term solution for RTF (Return to Flight).\u2019<\/font><\/p>\n \u2018It is considered adequate as flight rationale, but does carry some level of risk compared to the normal process for accepting new environments\/certification, (given) this is only an evaluation of load indicators. The roll manoeuvre indicator data cannot be \u2018incorporated\u2019 as an environment. \u2018This can be done only if indicators have already been validated and results are within certification experience. Only thrust structure indicators meet that criteria.\u2019<\/font><\/p>\n Further evaluations, based on the contents of the document, are bound to follow, with the concerns raised highlighting the vast amount of work that is on-going behind the scenes to ensure Shuttle flights are as safe as humanly possible.<\/font> <\/font> Further articles will follow on this specific subject. <\/p>\n <\/font><\/em> <\/p>\n <\/font><\/font><\/p>\n","protected":false},"excerpt":{"rendered":" Concerns have been raised over the need to re-certify elements of the Shuttle\u2019s roll program, following evidence that a Solid Rocket Booster attach strut neared its maximum design limits during Columbia\u2019s roll program on the ill-fated STS-107 mission. A presentation, dated April 19, collated by members of Boeing, the United Space Alliance and NASA, didn\u2019t […]<\/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-42088","post","type-post","status-publish","format-standard","hentry","category-news"],"acf":[],"_links":{"self":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/42088"}],"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=42088"}],"version-history":[{"count":0,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/42088\/revisions"}],"wp:attachment":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media?parent=42088"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/categories?post=42088"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/tags?post=42088"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}<\/font>The recommendations also note that \u2018SE&I should complete updates to Roll Manoeuvre environments and provide Orbiter with balanced loads cases and aero database updates perform certification rigor analysis of this environment.\u2019<\/font><\/p>\n
The information gained from this expanded database highlighted new information on the stresses a Shuttle experiences during the roll.<\/font><\/p>\n
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