- \n
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The other main issue of note relates to the troublesome ET Umbilical Well camera system, which appears to be a fleet-wide issue. Several efforts to download the images have failed, although 46 images of the separated tank are available to the crew, and will be assessed once Atlantis returns home.<\/p>\n
\u201cET Umbilical Well Camera File Transfer (AR 3949). Camera failed to transfer imagery to ground,\u201d noted last night\u2019s Mission Management Team (MMT) overview presentation, available on L2. \u201cGenerated the same error message on-orbit that was observed during repeated pre-flight tests \u2013 \u2018unable to transfer images from card\u2019.<\/p>\n
\u201cCrew reported that there are 46 images on the camera as expected. Images can be obtained from the memory card post-flight. The team will assess available time at the end of FD2 to see if a follow-up attempt to download these images is possible to support the damage assessment process.\u201d<\/p>\n
Spaceflight
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In other news, the Solid Rocket Booster Retrieval Status lists that: \u201cDive operations were completed successfully yesterday (Tuesday). Both boosters are under tow; Liberty Star and Freedom Star are expected to dock this morning at 0800L and 1100L respectively. Open assessment is scheduled for tomorrow at 0700L.\u201d<\/p>\n
Meanwhile, the damage sustained by Pad 39A during Atlantis\u2019 launch will not delay STS-127\u2019s schedule \u2013 with Endeavour due to transfer from Pad 39B to 39A after STS-400 LON (Launch On Need) standdown, for her STS-127 mission next month.<\/p>\n
\u201cPost-launch pad securing operations, wash-downs, and walk-downs are proceeding as planned,\u201d added processing information on Wednesday. \u201cThe team is continuing to evaluate pneumatic lines that were impacted by liberated Fondue Fyre. Initial reports indicate that the pneumatic lines can be replaced in less than a week and should be no issue for turnaround operations.\u201d<\/p>\n
Chine Damage Cleared\/TPS Latest:<\/p>\n
![\"a61\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2009\/05\/a61.jpg\" "\\"a61\\"")
The images will likely confirm the current theory that the debris strike on Atlantis originated from one of the ET Ice Frost Ramps (IFRs), although this can be assessed post-mission, after it took just several hours for the DAT (Damage Assessment Team) to clear the line of TPS \u2018dings\u2019 caused by T+102 seconds (estimated) event.<\/p>\nUPDATE: On Wednesday afternoon, DAT images confirmed a liberation from location Xt714 on ET-130 \u2013 further information will follow via an upcoming article \u2013 16mb DAT \u201cfull vehicle\u201d TPS status presentation being uploaded to L2.<\/p>\n
The damage was observed during the OBSS inspections on Flight Day 2, although at no point were members of DAT concerned with the initial observations, including it only as a note of interest in their general first look overview.<\/p>\n
\u201cDAT Status: Did see some indications of damage on starboard chine (21\u201d long skip down several tiles) in FD2 inspection imagery. No issues noticed for T-0 or lower surface, but data review is in work.<\/p>\n
\u201cUpper Canopy Inspections Complete: No damage failing criteria was identified. Starboard T-0 inspection complete: Data review in work. Lower surface scans initiated: No obvious damages identified. Chine damage identified: 106 sec debris event. WLE (Wing Leading Edge) sensor indications.<\/p>\n
\u201cThere were two indications from the wing leading edge sensors during ascent on the starboard chine that appear to correlate to available imagery for a noted debris event around the 106 second mark. FD2 inspections identified approximately 4 tiles in the area with dings. The tiles in this area are approximately 2.5 inches thick.\u201d<\/p>\n
WLE IDS:<\/p>\n
![\"a54\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2009\/05\/a54.jpg\" "\\"a54\\"")
The WLE indications came via a post Columbia modification called the WLE IDS (Wing Leading Edge Impact Detection System), a post Columbia modification that allows the orbiters to \u201cfeel\u201d any impacts on their critical leading edge TPS via a network of embedded sensors.<\/p>\nThe system is so sensitive, \u2018ghost triggers\u2019 can be registered throughout a mission via thermal conditions interacting with the orbiter\u2019s hardware.<\/p>\n
It was the WLE IDS sensors that likely \u2018felt\u2019 the debris impact on the chine area of Atlantis\u2019 starboard WLE, the first of which was timed at T+104.3 seconds, measuring at 2.9 Grms \u2013 which is still a low reading, with only readings over 10 Grms usually deemed as the benchmark for an impact of concern.<\/p>\n
The second was timed at T+120 seconds, measuring only 1.8 Grms, immediately adding confidence that the impacts were unlikely to be of a major concern.<\/p>\n
\u201cAll WLE IDS ascent summary data were down linked and downloaded successfully,\u201d noted the WLE IDS presentation to the MMT, available on L2. \u201cThirteen (13) half second windows of detailed G time histories were downloaded in order to confirm the implication of cases above 1 Grms. There are no reportable indications on the RCC. However, two (2) indications were identified on the starboard chine area.<\/p>\n
\u201cOverall, STS-125 background levels are very similar to background levels of previous missions. No data anomalies have been identified. All units triggered on Main Engine Ignition within 0.15 seconds of each other.\u201d<\/p>\n
Tyvek Covers:<\/p>\n
![\"a39\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2009\/05\/a39.jpg\" "\\"a39\\"")
The only other item of interest via ascent imagery related to a couple of late releasing Tyvek Covers \u2013 used to protect the Reaction Control Systems (RCS) thrusters from water and debris intrusion during the pad flow. This is also not an unusual issue, and is only noted as late releases have a small amount of potential to become debris hazards at high velocity.<\/p>\nThe covers are designed to liberate from the vehicle within seconds of launch, however, during STS-125\u2019s launch, a small piece of cover remained attached to the F4D thruster, before liberating later in ascent. It failed to impact the orbiter.<\/p>\n
\u201cGround imagery reported that when thrusters F3D\u2019s and F4D\u2019s Tyvek rain covers released at 131\/18:02:03.9 (00\/00:00:07.9 MET) at ~150 ft\/sec (~102 mph) and 131\/18:02:4.4 (00\/00:00:08.4 sec MET) at ~160 ft\/sec (~109 mph), respectively, a piece remained attached to each thruster lip,\u201d noted a report on a MER presentation to the MMT.<\/p>\n
\u201cThe F3D piece separated at 131\/18:02:15.2 GMT (00\/00:00:19.2 MET) at ~413 ft\/sec (~282 mph). The F4D piece separated at 131\/18:02:15.8 (00\/00:00:19.8 MET at ~428 ft\/sec (~292 mph).<\/p>\n
\u201cThe estimated size of each piece is ~2 grams, which within accepted limits. Imagery indicates that the pieces that released late did not impact the Orbiter.\u201d<\/p>\n
Flight Day 3 (FD3) Overview (refer to live updates for up to the second coverage):<\/p>\n
![\"a45\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2009\/05\/a45.jpg\" "\\"a45\\"")
During what will be an historic day for the space program, Atlantis will mark the final time an orbiter will rendezvous with the Hubble Space Telescope.<\/p>\nThe Flight Day will consist of the rendezvous, HST\u2019s Solar Arrays positioned for grapple by Atlantis\u2019 RMS, HST grapple and berth on Flight Support System (FSS), the Shuttle Robotic Arm survey of HST, and an EVA 1 procedure review.<\/p>\n
Pre-empting her arrival, the Space Telescope Operations Control Center (STOCC) at Goddard are finalizing their preparations of the Telescope for the start of its re-servicing.<\/p>\n
\u201cGround Commanding: The STOCC performs several steps to prepare HST for rendezvous and berthing with the orbiter,\u201d noted FD2 to FD3 outlines on the Flight Plan Walkthrough (L2).<\/p>\n
\u201cHighlights for FD2 through FN2 include dumping of onboard Solid State Recorders (SSR), closure of the aperture door (AD), maneuvering HST to the rendezvous attitude, reconfiguration of the comm. system from High Gain Antenna (HGA) to the Low Gain Antenna (LGA) direct TDRS, reconfig of three gyro operations, load shedding activity, and HGA deactivation retraction (to maximize clearance for HST grapple).<\/p>\n
\u201cThe STOCC maneuvers HST to a rendezvous attitude designed to maintain HST power and minimize plume loading on the solar arrays (SA\u2019s) at the 1500 foot normal Z braking gate.<\/p>\n
\u201cThis attitude is determined by the conditions as follows: Sun in the V1-V3 plane and +V1 pointing down the R-bar at an orbit angle of 59 deg before orbital noon.<\/p>\n
\u201cThe STOCC slews the solar arrays to 90 degrees, to provide clearance with RMS. The orbiter approaches HST using an R-bar approach to minimize prop usage and potential contamination.\u201d<\/p>\n
![\"a210\"](\"https:\/\/www.nasaspaceflight.com\/wp-content\/uploads\/2009\/05\/a210.jpg\" "\\"a210\\"")
The orbital ballet between Atlantis and Hubble will see the orbiter approach HST from below, rising up the R-bar, ahead of capturing Hubble via the Shuttle RMS.<\/p>\n\u201cBefore the orbiter is within 200 feet of HST, HST performs a roll maneuver to the capture attitude to align the +V2 grapple fixture on HST with the RMS. The roll mnvr will place the -V3 52 degrees out of plane north as measured on the anti-Sun side of HST.<\/p>\n
\u201cThe magnitude of the roll mnvr is ~ V1 = Beta \u2013 52 degrees, resulting in a roll that ranges from 0 deg to -104 degrees. Orbiter then performs an inertial approach.<\/p>\n
\u201cHST Approach & RMS Capture\/Berth Operations: The RMS is used for grappling and berthing the HST in the orbiter payload bay. Grapple is timed for sunset + 5 minutes. RMS HST maneuvering is done with Orbiter in freedrift.\u201d<\/p>\n
Hubble will then be secured on the FSS at the aft of the Payload Bay, latched into place for an imagery survey of the telescope, ahead of the of the EVA work that will result in Hubble\u2019s life span being extended well into the next decade.<\/p>\n
\u201cHST Configuration at Berth: Orientation: -V3 Forward. Solar Array Position: 90 deg. External Power Activation (Crew & STOCC) \u2013 After umbilicals connected at the end of the Berth (Latch & Mate procedure), FSS Power Control Units (PCU\u2019s) , external main power and external essential power are applied.<\/p>\n
\u201cPhoto\/TV05 Survey (-V3) via RMS and P\/TV. Battery Charging \u2013 one full daylight pass. Solar Array Slew to 0 degrees in preparation for EVA 1 on FD4. Array\u2019s are slewed after completion of battery charging and maneuver to overnight attitude (\u2013ZLV \u2013XVV).\u201d<\/p>\n
EVA-1 will begin on Flight Day 4, conducted by John Grunsfeld and Andrew Feustel \u2013 the first of five planned spacewalks during STS-125. Preparations have already begun for the opening EVA.<\/p>\n
\u201cAirlock Prep was completed followed by checkout of EMUs 3015 & 3017 starting at 13:37 GMT (Tuesday). All suit data was nominal & battery recharge of s\/n 2080 & 2070 was completed. EMUs were then swapped out & checkout of EMUs 3008 & 3004 began at 16:39 GMT. All suit data was nominal & battery recharge of s\/n 2081 & 2082 was completed,\u201d noted a status report.<\/p>\n
\u201cAs expected, the BATT V DECAY message was received after FAN start up on the 3 EMUs with new ICBs installed (s\/n 2080-2082). The battery team has observed this signature for the new ICBs during initial cycles & determined this to be nominal.<\/p>\n
\u201cCabin has been depressed to 10.4 PSI in preparation for the upcoming EVAs.\u201d<\/p>\n
More will follow throughout Flight Day 3.<\/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":"
With the debris strike on Atlantis\u2019 starboard chine Thermal Protection System (TPS) \u2013 now confirmed as a liberation from an Ice Frost Ramp on External Tank (ET-130) \u2013 cleared within hours of its observation via the Orbiter Boom Sensor System (OBSS), the orbiter and her STS-125 crew have completed rendezvous operations with the Hubble Space Telescope […]<\/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":[4259,9197,8290],"class_list":["post-41106","post","type-post","status-publish","format-standard","hentry","category-news","tag-hubble","tag-mmt","tag-sts-125"],"acf":[],"_links":{"self":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/41106"}],"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=41106"}],"version-history":[{"count":0,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/41106\/revisions"}],"wp:attachment":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media?parent=41106"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/categories?post=41106"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/tags?post=41106"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}