GordonD Posted December 1, 2020 Share Posted December 1, 2020 1 DECEMBER 1985 Jerry Ross & Sherwood Spring (STS-61B) Duration 6 hr 42 min The astronauts continued their assessment of on-orbit construction techniques by once again working on the ACCESS and EASE structures. The ACCESS beam was assembled from the bottom up, the individual parts being fitted together in a jig mounted in the cargo bay, then slid upwards to make room for the next section. After nine segments had been put together this way, Ross tried a different approach by stepping into the manipulator arm's foot restraint before Mary Cleave lifted him to the top of the tower, where he assembled the tenth unit at the far end. Ross then attached a tether to the side of the tower, simulating the installation of a power cable. Next, Spring released the bottom of the tower so that Ross could test handling the structure, assessing an astronaut's ability to assemble a beam in one place then install it in another. Ross replaced the tower in the assembly jig to show that this was possible. The astronauts then switched places, Spring changing one of the beams to simulate structural repair. ACCESS was then dismantled and the astronauts put together the EASE pyramid, which was also detached from its mounting to demonstrate handling procedures with large components. Overall, it was determined that ACCESS worked well, while the EASE structure, using free-floating techniques, proved more difficult. The astronauts reported that the hardest part of the procedure was in steadying their own bodies while trying to manoeuvre the components. They did, however, judge that carrying out a six-hour EVA every second day would not be too demanding. Second EVA for both astronauts, but Spring's last: his total for the mission amounts to 12 hr 14 min. 1 Link to comment Share on other sites More sharing options...
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