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. 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 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. 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. References External links NASA -Space Shuttle page Space Shuttle program Spacecraft components