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Engineers are busy working pre-rollaround requirements ahead of the weekend, with the hope of finding schedule solutions to allow for the June 13 target to be achieved. The main focus of late has been on Hyper Load\/Adjustments and Ordnance Disconnects, following the standdown from her Pad 39B STS-400 LON (Launch On Need) requirement.<\/p>\n
\u201cS0024 Prelaunch Propellant Servicing: FRCS (Forward Reaction Control System) and OMS oxidizer loads were completed. FRCS and OMS fuel loads were completed; QD (Quick Disconnect) leak checks and purges are in-work,\u201d noted processing information on L2.<\/p>\n
\u201cS5009, Ordnance disconnect in preparation for roll to Pad A will pick up today following completion of propellant loading operations. S0038 preps for roll-around to Pad A begin today.\u201d<\/p>\n
FRR Overview \u2013 ASA:<\/p>\n
NASA mission patches
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Managers worked through around 30 presentations \u2013 main, back up and revisions \u2013 at the SSP FRR. All FRRs include the IFAs from the previous mission, but due to the close proximity of the servicing mission to Hubble and STS-127, the STS-125 IFA review was completed prior to Atlantis landing in California.<\/p>\n
This achievement allowed for a complete FRR overview to be presented even prior to Atlantis\u2019 return to her Orbiter Processing Facility (OPF).<\/p>\n
![\"a227\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2009\/05\/a227.jpg\" "\\"a227\\"")
Ironically that milestone has become one of the main areas of interest on the timeline, as engineers await instructions on whether they are required to check the wiring on the orbiter \u2013 which can only be carried out in the OPF \u2013 to find a root cause to the ASA-1 failure, and thus ensure the same issue won\u2019t arise on Endeavour.<\/p>\n\u201cAll organizations polled go pending open work\/issues and go to hold the Agency FRR on 6\/3 (0800 at KSC). As expected there was significant discussion on whether OV104 (Atlantis) wiring inspections are required prior to STS-127,\u201d added the FRR minutes\/review.<\/p>\n
\u201cMost in the community do not consider this a constraint since wiring inspections for OV105 (Endeavour) were completed while they were not for OV104 and KSC has demonstrated processes to mitigate wiring damage caused during processing.<\/p>\n
\u201cNo decision was made as to whether they are required but the plan is to perform inspections as soon as the vehicle is back in the OPF (estimated to begin around the weekend of 6\/6).\u201d<\/p>\n
Even if inspections are called, it is unlikely such a decision would lead to a delay to STS-127, unless a serious issue was found on Atlantis.<\/p>\n
The main body responsible for the systems, the Orbiter Project Office (OPO), noted they do not feel the ASA-1 issue is a constraint for STS-127, although some engineering bodies remain unconvinced and voted in favor of the inspections being carried out on Atlantis upon her return to Florida.<\/p>\n
\u201cMost likely cause for ASA1 failure is an external wiring short. Orbiter\u2019s position is that this anomaly is not a constraint to STS-127 since OV105 (Endeavour) baseline wire inspections were completed for OV105 but were not for OV104,\u201d added the notes. \u201cInspections of OV105 wiring are predicted to start about the weekend of 6\/6 assuming the ferry flight departs EDW around Sunday (currently the schedule).<\/p>\n
\u201cThere was significant discussion on whether the OV104 wiring inspections should be a constraint to STS-127. Most felt the OV105 wiring inspections and the processes KSC implemented for mitigating wiring damage were sufficient. However, the community is not in complete agreement.<\/p>\n
\u201cNo decision was made as to whether OV104 wiring inspections are a constraint to STS-127 \u2013 (Shuttle Manager John) Shannon polled several orgs to determine where the community stands.\u201d<\/p>\n
Managers will meet again at Friday\u2019s \u201cnoon board\u201d to make a final decision on whether the wiring inspections on Atlantis will take place, before the subject is discussed further at the Agency FRR next week.<\/p>\n
UPDATE: Inspections required, and have already started at Dryden. The Ferry flight is now slightly delayed to a Monday depature due to poor weather that had delayed the installation of the tail cone around Atlantis\u2019 aft. Full story on Altantis\u2019 status will be published in the next article.<\/p>\n
FRR Overview \u2013 Payload:<\/p>\n
![\"a320\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2009\/05\/a320.jpg\" "\\"a320\\"")
Inspections are already being carried out on Endeavour\u2019s JAXA payload, following two events of interest that made a revision of the SSP FRR Payload overview presentation.<\/p>\n\u201cPayload processing reported two late breaking Problem Reports. One was for a lightning strike event that had no impact and another for water intrusion into the 2JA payload element while in the transportation canister,\u201d noted the SSP FRR overview notes.<\/p>\n
\u201cThe evidence indicates that driving rain entered the canister through the positive pressure relief vent. They are not anticipating an issue for flight but are proceeding with inspections, drying, cleaning as necessary.\u201d<\/p>\n
The Payload revision itself outlined the two events in greater detail, starting with the lightning strike in the Pad 39A area, where STS-127\u2019s payload was installed into the Payload Checkout Room (PCR).<\/p>\n
\u201cAt 14:02:29 EDT on 5\/22\/09, the Cloud to Ground Lightning Surveillance System (CGLSS) indicated a strike within the Pad A perimeter,\u201d outlined the STS-127 SSP FRR Payload presentation (rev1) on L2. \u201cPeak current amplitude: 5.8 kA. Distance from strike to nominal SSV position: 0.05 nmi<\/p>\n
\u201cISS-2JA\/STS-127 payload elements were in the payload transportation canister on the Pad A surface at the time of the strike \u2013 canister ECS system (on shore power) continued to operate nominally after the strike. Strike was not observed\/detected by OTV, the Catenary Wire Lightning Instrumentation System (CWLIS), or the Ground Lightning Monitoring System (GLMS) magnetic field sensors.<\/p>\n
\u201cElectromagnetic Environmental Effects (E3) Team preliminary calculations indicate that the magnetic field from this strike was 10 amperes\/meter. (Requirements documentation) requires that ISS hardware be capable of withstanding fields of 40 amperes\/meter when protected by facility or other structures<\/p>\n
\u201cUse \u201cas is\u201d disposition being coordinated with element\/ORU providers.\u201d<\/p>\n
![\"a511\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2009\/05\/a511.jpg\" "\\"a511\\"")
The second issue, relating to a minor water intrusion into the payload canister, is also being inspected. This too is unlikely to become an issue for the flow towards launch.<\/p>\n\u201cEvidence of water intrusion was detected on the 2JA payload elements following transfer from the transportation canister to the Payload Ground Handling Mechanism (PGHM) on 5\/24\/09,\u201d added the SSP FRR Payload presentation.<\/p>\n
\u201cWith the exception of approximately one ounce of liquid water discovered in a grapple fixture bracket pocket on the ICC-VLD, all evidence consists of \u201cwater marks\u201d left by evaporated water droplets. Water marks can be observed on the keel trunnions (see photo) and adjacent structure on all three elements<\/p>\n
\u201cWater is theorized to have entered the canister through the positive pressure relief vent (see photo) during driving rain conditions on 5\/22- 23\/09. All elements will be inspected, dried, and cleaned, as necessary<\/p>\n
\u201cUse \u201cas is\u201d rationale is being coordinated with element\/ORU providers.\u201d<\/p>\n
Several other items of interest from the STS-125 IFA made the SSP FRR for STS-127.<\/p>\n
Debris related incidents on the External Tank (ET-130), the Tail Service Mast (TSM) T-0 Umbilical \u2013 similar to STS-126 \u2013 and what is being classed as a large post ascent foam loss event on the RSRM (Reusable Solid Rocket Motor) stiffeners, all made the FRR. None of the items are being deemed as a constraint to STS-127\u2019s launch.<\/p>\n
The above items will be outlined in details via upcoming articles.<\/p>\n
L2 members<\/em><\/em>: Documentation \u2013 from which most of 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 remains on track for the setting of a June 13 or 14 launch date at next week\u2019s Agency level Flight Readiness Review (FRR), despite the requirement for additional SSP (Space Shuttle Program) level evaluations. Several factors, including Atlantis\u2019 In Flight Anomalies (IFAs) \u2013 notably the Aerosurface Servoamplifer (ASA) channel 1 fault \u2013 are still up […]<\/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":[9221,3610,8925,877,8290,9038],"class_list":["post-41088","post","type-post","status-publish","format-standard","hentry","category-news","tag-asa","tag-frr","tag-ifa","tag-jaxa","tag-sts-125","tag-sts-127"],"acf":[],"_links":{"self":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/41088"}],"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=41088"}],"version-history":[{"count":0,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/41088\/revisions"}],"wp:attachment":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media?parent=41088"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/categories?post=41088"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/tags?post=41088"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}