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This is a nominal timeline for bringing an orbiter home, with consumables limited by LiOH canister (CO2 scrubbing) availability on board the orbiter for a +2 EOM (End Of Mission) schedule.<\/p>\n
\u201cAll Life Support systems are performing nominally. There are no issues being worked at this time,\u201d according to Mission Evaluation Room (MER) notes on L2. \u201cGN2 Total: 323.8 lbm Total Supply Water: 526.5 lbm Waste Water Total Qty: 71.7 percent 121.6 lbm.\u201d<\/p>\n
The final Orbit Adjust (OA) burn was successfully carried out on Thursday, involving a short burn of multiple Reaction Control System (RCS) thrusters.<\/p>\n
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\u201cOA was a PRCS Multi Axis burn (F1F, F2R, F2U, F3F, F3D, F4D, L1U, L4D, L3L, R1U, R3R, and R4D) occurring at TIG of 211\/11:24:09 GMT,\u201d noted Mission Management Team (MMT) notes on L2. \u201cThe burn time was 21.7 seconds with a delta V of 5.4 fps. The resulting orbit was 174.4 x 184.1 nmi. No Trim was required.\u201d<\/p>\n
![\"G3\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2009\/07\/G31.jpg\" "\\"G3\\"")
However, it was during the Flight Control Surface (FCS) checkouts that one thruster \u2013 F2F \u2013 behaved off-nominally. This incurs no mission impact, due to redundancy and lack of use during re-entry.<\/p>\n\u201cRCS Hotfire Procedure was initiated earlier than originally planned per crew request. Procedure was initiated at 211\/08:36:46 GMT and terminated at 211\/08:55:38 GMT,\u201d added MMT notes.<\/p>\n
\u201cAll 38 RCS jets were fired at least twice for at least 0.240 seconds per pulse with the exception of F2F. All thrusters have now been fired.<\/p>\n
\u201cF2F Failed Off on the first attempted pulse. Failure was annunciated by RM at 211\/08:48:51 GMT. Jet is a third priority and not required for entry.\u201d<\/p>\n
Debris was also photographed by the crew during the FCS checkouts, although it is not understood to be anything other than ice.<\/p>\n
Evaluations of the images on the ground have ruled out a similar incident to that observed by Discovery during the same checks on STS-124 \u2013 when a Rudder Speed Break (RSB) tab liberated from the aft of the vehicle.<\/p>\n
Fleet-wide checks of that particular piece of hardware have since been carried out.<\/p>\n
![\"G2\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2009\/07\/G21.jpg\" "\\"G2\\"")
\u201cImagery of Debris During FCS Checkout,\u201d noted one MMT presentation by the Orbiter Project Office. \u201cTaken by the Crew with hand-held still cameras. Imagery reviewed by DAT (Damage Assessment Team) and can not associated with Orbiter hardware.\u201d<\/p>\nUpdate: This has since been classed as ice.<\/p>\n
Endeavour continues to perform extremely well, with only a handful of issues noted on the Mission Evaluation Room (MER) \u201cfunny\u201d list, most of which are not specific to the orbiter herself.<\/p>\n
\u201cLoss of HUD Mini-cam Video (Bad Cable). Initially could not get HUD video. The crew eventually found the faulty cable and routed around it. Should be no impact,\u201d was one example of the latest \u201cfunny\u201d to make the list.<\/p>\n
The Late Inspections provided a clear assessment of the vehicle\u2019s TPS health during the docked phase of the mission, and confirmed a very \u201cclean\u201d orbiter. This resulted in the DAT engineers to allow the Mission Management Team (MMT) to give a go for re-entry.<\/p>\n
\u201cOverall coverage was very similar to the \u2018as-designed\u2019 coverage. The few areas that had slightly worse predicted coverage (some carrier panel tiles and a small section of the nosecap) were previously cleared or had adequate coverage, just less than ideal angle of incidence,\u201d noted the DAT assessment notes on L2.<\/p>\n
\u201cThe Imagery Analysis team has reviewed all of the images and the LESS\/RCC team has cleared all late inspection regions of interest, giving a \u2018GO\u2019 for re-entry. This data was presented at the OPO (Orbiter Project Office) and MMT meetings, who concurred with the \u2018GO\u2019 for re-entry.\u201d<\/p>\n
![\"G4\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2009\/07\/G41.jpg\" "\\"G4\\"")
A total of 141 Regions Of Interest (ROIs) were observed on Endeavour\u2019s heatshield, which is below the average of 153 per flight \u2013 an average based on OBSS (Orbiter Boom Sensor System) availability since Return To Flight.<\/p>\n\u201cLESS\/RCC team cleared all late inspection regions of interest,\u201d noted the DAT findings presented to the MMT. \u201cLevel 1 completed. Level 2 completed. Final disposition complete. No ROI exhibited any damage characteristics. The LESS PRT is GO for entry.\u201d<\/p>\n
Also notable was the lack of triggers on the Wing Leading Edge (WLE) Impact Detection System (IDS), a suite of sensors embedded into the leading edges of the orbiter\u2019s wings which are used to \u201cfeel\u201d any impact on the WLEs. The system is mainly used for ascent, but can also be used for on orbit monitoring for potential MMOD impacts.<\/p>\n
During the latest monitoring phase \u2013 called for during Late Inspections \u2013 no triggers were noted.<\/p>\n
\u201cWing Leading Edge Monitoring. Around 8.5 hrs monitoring on FD 15 during late inspection,\u201d noted the DAT assessments. \u201cNo triggers observed. WLE completed the WLES deactivation and teardown.\u201d<\/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":"
Endeavour has concluded her STS-127 mission by returning to her home base at the Kennedy Space Center (KSC) in Florida. She landed at 10:48am local time on Flight Day 17 of the highly successful mission to the International Space Station (ISS). One item of interest \u2013 relating to observed debris near the vehicle \u2013 was […]<\/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":[9038,7935],"class_list":["post-41036","post","type-post","status-publish","format-standard","hentry","category-news","tag-sts-127","tag-tps"],"acf":[],"_links":{"self":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/41036"}],"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=41036"}],"version-history":[{"count":0,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/41036\/revisions"}],"wp:attachment":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media?parent=41036"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/categories?post=41036"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/tags?post=41036"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}