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For this reboost, the ISS\u2019 attitude control was performed by the station, while two of ATV-3\u2019s four engines fired to raise the orbital outpost to an altitude that will reach as high as 395.6 km at apogee.<\/p>\n
\u201cTonight\u2019s reboost was successfully performed using the ATV OCS (Orbital Control System) thrusters starting at 19:05 GMT \/ 21:05 CEST. The delta-V (DV \u2013 change in Station velocity) was 2.2 m\/s for a 15-minute burn, which raised the ISS by 3.86 km to a higher orbit,\u201d noted ESA\u2019s Mike Steinkopf on ESA\u2019s ATV blog coverage.<\/p>\n
The next reboost to be conducted by ATV-3 is scheduled for April 25.<\/p>\n
Power Loss Latest:<\/p>\n
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It has been over a week since Edoardo Amaldi successfully docked with the Russian Zvezda module. The procedure was monitored by ESA astronaut Andr\u00e9 Kuipers and Russian cosmonaut Oleg Kononenko from inside the ISS and by the ESA\/CNES mission operations team at the ATV Control Centre, Toulouse.<\/p>\n(Animation created from 70 hi res ATV-3 docking images acquired by L2 \u2013 LINK).<\/p>\n
As noted in a previous article, the vehicle suffered from a power loss shortly after docking. This related to ATV\u2019s requirement for electrical power from the ISS during their Attached Phase Operations (APO), power which is provided by the Russian Service Module (SM) \u201cZvezda\u201d via the ATV\u2019s Russian Docking System (RDS) interface.<\/p>\n
The SM provides power to the ATV\u2019s Russian Equipment Control System (RECS), which features two power chains \u2013 a primary and a backup \u2013 and the RECS in turn distributes power via a power bus to the four Russian Systems Interface Units (RICUs), which interface the RECS with ATV\u2019s 1553 bus, to which the ATV\u2019s avionics system and electrical outlets are connected.<\/p>\n
![\"\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2012\/04\/Z34.jpg\" "\\"Z3\\"")
The problem occurred shortly after the crew installed an air scrubber to remove any contaminants inside ATV\u2019s pressurised cargo area. As part of this procedure, the crew also installed the Russian POTOK air filter unit as a measure against any bacterial contamination that may have occurred on ground before the hatch was closed for launch.<\/p>\nThe ATV then experienced a fault in one of the two aforementioned power chains of the onboard electronics system that controls its electrical power connections to the Zvezda module. This was a serious problem, as internal notes spoke of a potential need to undock ATV-3 within days if the problem remained unresolved.<\/p>\n
\u201cA string swap is being attempted to recover power. If that is not successful, undock could be required as early as Monday (April 2nd). The solar arrays are providing power now, but this will not be sufficient in the long term,\u201d noted via L2 ISS Status Updates (L2 Link).<\/p>\n
![\"\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2012\/04\/Z44.jpg\" "\\"Z4\\"")
\u201cImpact discussions have been initiated. VIPER was asked to assess alternate attitudes for improved power generation, which is being worked in parallel with early undocking plans. If an early undock is required, the teams will talk more about the constraints on ingress for offload of critical cargo.\u201d<\/p>\nHowever, thanks to the skill of the ISS team, the RECS chain swap was successfully completed on Saturday, restoring integrated power between ISS and ATV-3. As a result of the integrated power recovery, planning meetings for the contingency undock were cancelled. ISS crewmembers also reverted from the transfer of high priority cargo to a \u201cregular pace\u201d of transfers.<\/p>\n
Teams are continuing to investigate the chain 1 power anomaly and possibility that the POTOK \u2013 manifested in the Service Module \u2013 was the root cause.<\/p>\n
![\"\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2012\/04\/Z53.jpg\" "\\"Z5\\"")
Further information was noted on an ISS presentation relating to preparations for the upcoming \u2013 and historical \u2013 arrival of SpaceX\u2019s Dragon spacecraft, which is scheduled to launch atop of a Falcon 9 on April 30 from Cape Canaveral, ahead of its C2 (D2) and C3 (D3) COTS (Commercial Orbital Transportation Services) test milestones.<\/p>\n\u201cObservation: Late 3\/29\/12 (GMT 90), the Service Module (SM) power feed to ATV 3 (RECS channel 1) was lost. A chain swap (RECS channel 1 to 2) was successfully completed on Saturday, restoring integrated power between ISS and ATV3,\u201d noted one of the presentations available on L2\u2019s new SpaceX Dragon C2\/C3 Mission Special Section \u2013 (L2 Link).<\/p>\n
\u201cDiscussion: Teams are continuing to investigate the anomaly and future troubleshooting for the RECS chain 1 power anomaly and possibility that the Russian air scrubber used for ATV3 (POTOK ) was the cause. \u201cRisk Assessment: Low. Acceptable (Condition) for SpaceX Demo Flight? Yes.\u201d<\/p>\n
![\"\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2012\/04\/Z411.jpg\" "\\"Z41\\"")
The presentation also noted that another POTOK is available on the ISS, with teams evaluating a potential swap and test procedure to resolve the root cause of the power failure.<\/p>\n\u201cStatus: There is another POTOK in the FGB that may be interchanged with the SM POTOK . The FBG POTOK is a known good POTOK. Ground teams are evaluating swapping the two to see if this resolves the problem (indicting the SM POTOK as the cause),\u201d added the notes.<\/p>\n
\u201cEnergia and Krunichev are performing integrated testing with POTOK see if the on orbit signature is recreated.\u201d<\/p>\n
Meanwhile, one of ATV-3\u2019s Tracking and Data Relay Satellite (TDRS) channels apparently failed on Thursday, according to non official notes. Controllers have switched to a backup system for the interim.<\/p>\n
\u201cATV TDRSS Chain 2 Failure: ATV TDRSS Chain 2 Failed on GMT 095 during Orbit 2. The cause for this failure is under investigation. Chain 2 is normally the prime chain,\u201d according to the L2 ISS Status Updates.<\/p>\n
However, the notes added that should both TDRS chains fail, the Prox link can still communicate with ESA ground sites, Also, the Debris Avoidance Maneuver (DAM) capability still exists with both TDRS chains failed once a Prox Link has been established.<\/p>\n
(Images: L2\u2019s ISS, ATV and Dragon C2\/C3 Sections)<\/p>\n
(NSF and L2 are providing full transition level coverage, available no where else on the internet, from Orion and SLS to ISS and COTS\/CRS\/CCDEV, to European and Russian vehicles).<\/p>\n
(Click here: http:\/\/www.nasaspaceflight.com\/l2\/ \u2013 to view how you can access the best space flight content on the entire internet)<\/p>\n","protected":false},"excerpt":{"rendered":"
Europe\u2019s Automated Transfer Vehicle-3 (ATV-3) \u201cEdoardo Amaldi\u201d raised the International Space Station\u2019s orbit by nearly four kilometers on Thursday evening, aiding the phasing requirements for its Russian cousins. ATV-3 continues to have its power loss issue evaluated, while one of its Tracking and Data Relay Satellite (TDRS) channels apparently failed on Thursday. ATV-3 Reboost: Thursday\u2019s […]<\/p>\n","protected":false},"author":1,"featured_media":29791,"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":[4140,233,7900],"class_list":["post-40160","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-atv","tag-iss","tag-russian"],"acf":[],"_links":{"self":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/40160"}],"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=40160"}],"version-history":[{"count":0,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/40160\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media\/29791"}],"wp:attachment":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media?parent=40160"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/categories?post=40160"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/tags?post=40160"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}