The Orbiter Boom Sensor System (OBSS) was a 50-foot (15.24 m) boom carried on board NASA's Space Shuttles. The boom was grappled by the Canadarm and served as an extension of the arm, doubling its length to a combined total of 100 feet (30 m).[1] At the far end of the boom was an instrumentation package of cameras and lasers used to scan the leading edges of the wings, the nose cap, and the crew compartment after each lift-off and before each landing. If flight engineers suspected potential damage to other areas, as evidenced in imagery captured during lift-off or the rendezvous pitch maneuver, then additional regions could be scanned.
Shuttle Remote Manipulator System (RMS) holding OBSS boom on STS-114Astronaut Scott Parazynski at the end of the OBSS boom making repairs to the P6 solar array
The OBSS was introduced to the shuttle fleet with STS-114, the "Return to Flight" mission executed by Discovery, and was flown on every mission after that until the retirement of the Space Shuttle fleet in 2011. It was used to inspect the shuttle for damage to the heat shield, officially called the Thermal Protection System (TPS), that could jeopardize the shuttle during re-entry. The decision to perform focused inspections of the TPS was prompted by the Space Shuttle Columbia disaster, in which Columbia was destroyed due to damage inflicted to its TPS during launch. The OBSS was central to focused inspections of the TPS, not only because it carried all the instruments necessary for detailed measurements and observations, but also because without it, the Canadarm was too short to reach to all the areas that needed to be surveyed.
The boom was essentially the same design as the Canadarm itself, except that the articulatory joints are fixed.[2] OBSS arms for the three remaining orbiters were manufactured relatively quickly, primarily because some spare parts for the Canadarm system were used.
Two instrumentation packages are installed at the far end of the OBSS. Sensor package 1 consists of the Laser Dynamic Range Imager (LDRI) and an Intensified Television Camera (ITVC). Sensor package 2 is the Laser Camera System (LCS) and a digital camera (IDC). The sensors can record at a resolution of a few millimeters, and can scan at a rate of about 2.5 inches (64 mm) per second.
It is also fitted with handrails, so that the boom could be used to provide spacewalkers with access to the shuttle's underbelly in case in-flight repairs were required.
During STS-120 the OBSS was used as an extension boom for the space station's Canadarm2, something it was never designed to do. During this mission the P6 solar array had become damaged during the redeploy. Canadarm2 grabbed the arm on its center Flight-Releasable Grapple Fixture and then astronaut Scott E. Parazynski was mounted at the end of the boom to make the repair.[3] Because Canadarm2 was unable to power the OBSS, it was without power many hours more than it was designed to handle, but because it was heated up considerably before the start of the repair it stayed undamaged.
Enhanced ISS boom assemblyedit
Due to the benefits for spacewalkers from the extended range provided by connecting an OBSS to the International Space Station (ISS)'s robotic arm, NASA implemented a plan for STS-134 to leave its OBSS behind on the ISS, where it would permanently remain.[4] The plan resulted in a number of modifications to the OBSS, now known as the Enhanced ISS Boom Assembly, including the addition of a Power Data and Grapple Fixture which enables mating to the robotic arm on the end of the boom with a Canadarm2-compatible grapple fixture to favor station use. The boom was stowed on the ISS S1 Integrated Truss Structure on the fourth spacewalk of STS-134 on May 27, 2011. The OBSS sensors were disconnected during the EVA, and are not designed to withstand thermal conditions outside the ISS without power to keep them warm. However, the modification of the grapple fixture could enable such equipment to be mounted onto the OBSS in the future.[5]
^CSA: Inspection Boom by MDA: One of critical Canadian tools that serves the return to flight[permanent dead link]
^Greaves, Sarah; Boyle, Keith; Doshewnek, Nik (2005). "Orbiter Boom Sensor System and Shuttle Return to Flight: Operations Analyses". AIAA Guidance, Navigation, and Control Conference and Exhibit. doi:10.2514/6.2005-5986. ISBN978-1-62410-056-7.
^"NASA approve funding to leave OBSS permanently on the ISS". January 27, 2009. Retrieved 2009-02-15.
External linksedit
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April 11, 2024
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The Orbiter Boom Sensor System OBSS was a 50 foot 15 24 m boom carried on board NASA s Space Shuttles The boom was grappled by the Canadarm and served as an extension of the arm doubling its length to a combined total of 100 feet 30 m 1 At the far end of the boom was an instrumentation package of cameras and lasers used to scan the leading edges of the wings the nose cap and the crew compartment after each lift off and before each landing If flight engineers suspected potential damage to other areas as evidenced in imagery captured during lift off or the rendezvous pitch maneuver then additional regions could be scanned Shuttle Remote Manipulator System RMS holding OBSS boom on STS 114Astronaut Scott Parazynski at the end of the OBSS boom making repairs to the P6 solar arrayThe OBSS was introduced to the shuttle fleet with STS 114 the Return to Flight mission executed by Discovery and was flown on every mission after that until the retirement of the Space Shuttle fleet in 2011 It was used to inspect the shuttle for damage to the heat shield officially called the Thermal Protection System TPS that could jeopardize the shuttle during re entry The decision to perform focused inspections of the TPS was prompted by the Space Shuttle Columbia disaster in which Columbia was destroyed due to damage inflicted to its TPS during launch The OBSS was central to focused inspections of the TPS not only because it carried all the instruments necessary for detailed measurements and observations but also because without it the Canadarm was too short to reach to all the areas that needed to be surveyed Contents 1 Description 2 STS 120 ISS repair 3 Enhanced ISS boom assembly 4 References 5 External linksDescription editThe boom was essentially the same design as the Canadarm itself except that the articulatory joints are fixed 2 OBSS arms for the three remaining orbiters were manufactured relatively quickly primarily because some spare parts for the Canadarm system were used Two instrumentation packages are installed at the far end of the OBSS Sensor package 1 consists of the Laser Dynamic Range Imager LDRI and an Intensified Television Camera ITVC Sensor package 2 is the Laser Camera System LCS and a digital camera IDC The sensors can record at a resolution of a few millimeters and can scan at a rate of about 2 5 inches 64 mm per second It is also fitted with handrails so that the boom could be used to provide spacewalkers with access to the shuttle s underbelly in case in flight repairs were required STS 120 ISS repair editMain article STS 120 During STS 120 the OBSS was used as an extension boom for the space station s Canadarm2 something it was never designed to do During this mission the P6 solar array had become damaged during the redeploy Canadarm2 grabbed the arm on its center Flight Releasable Grapple Fixture and then astronaut Scott E Parazynski was mounted at the end of the boom to make the repair 3 Because Canadarm2 was unable to power the OBSS it was without power many hours more than it was designed to handle but because it was heated up considerably before the start of the repair it stayed undamaged Enhanced ISS boom assembly editDue to the benefits for spacewalkers from the extended range provided by connecting an OBSS to the International Space Station ISS s robotic arm NASA implemented a plan for STS 134 to leave its OBSS behind on the ISS where it would permanently remain 4 The plan resulted in a number of modifications to the OBSS now known as the Enhanced ISS Boom Assembly including the addition of a Power Data and Grapple Fixture which enables mating to the robotic arm on the end of the boom with a Canadarm2 compatible grapple fixture to favor station use The boom was stowed on the ISS S1 Integrated Truss Structure on the fourth spacewalk of STS 134 on May 27 2011 The OBSS sensors were disconnected during the EVA and are not designed to withstand thermal conditions outside the ISS without power to keep them warm However the modification of the grapple fixture could enable such equipment to be mounted onto the OBSS in the future 5 References edit NASA Shuttle in Shipshape Part II CSA Inspection Boom by MDA One of critical Canadian tools that serves the return to flight permanent dead link Greaves Sarah Boyle Keith Doshewnek Nik 2005 Orbiter Boom Sensor System and Shuttle Return to Flight Operations Analyses AIAA Guidance Navigation and Control Conference and Exhibit doi 10 2514 6 2005 5986 ISBN 978 1 62410 056 7 STS 134 Endeavour Archived from the original on 2011 07 15 NASA approve funding to leave OBSS permanently on the ISS January 27 2009 Retrieved 2009 02 15 External links edit nbsp Wikimedia Commons has media related to Orbiter Boom Sensor System NASA Space Shuttle page Retrieved from https en wikipedia org w index php title Orbiter Boom Sensor System amp oldid 1188402146, wikipedia, wiki, book, books, library,
