manned mission

manned mission

Skylab, The Second Manned Mission: A Scientific Harvest pt3-3 1973 NASA 11min

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video for embedding at http://scitech.quickfound.net/ "Included are observations of student experiments (the Minchmog minnows and Arabella, the spider), observations of student experiments, exercise routines, and the enabling of the Earth Resources Experiments Package. Also shown is planet Earth documentation, manned operation of the Apollo Telescope Mount for observations of the Sun and beyond, outside EVA activity, testing of the Astronaut Maneuvering Unit, experiments to explore industrial uses of space, and the Skylab living routine." part 1: http://www.youtube.com/watch?v=HoPohFoRgug part 2: http://www.youtube.com/watch?v=qCqrEdfyoSE Skylab Lessons Learned as Applicable to a Large Space Station (1976): http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19760022256_1976022256.pdf The second manned launch occurred on July 28, 1973, at 11:10:50.5 GMT (7:10:50.5 EDT). The crew, Astronauts Alan Bean, Dr. Owen Garriott, and Jack Lousma, was scheduled to remain in orbit for 59 days (the original 56-day mission was extended 3 days to obtain a more favorable recovery location. Since Skylab had a ground track which repeated every 5 days, the same location was possible on day 54or day 59. The good physical condition of the Skylab 1 crew was used by the Program Director to extend the mission to 59 days rather than shortening the mission... The Command and Service Module was inserted in a 154.7 km by 231.3 km orbit by the Saturn 1B. The required rendezvous maneuvers were performed and at about 8 hours after liftoff the station keeping with the workshop began, with docking occurring about 30 minutes later. This time docking went smoothly. However, during the rendezvous maneuvers, a leak in one of the service module reaction control system thruster valves (oxidizer) was noted... On the sixth day of the mission, a leak was discovered in a second reaction control system oxidizer line. This leak was in quad D. The propulsion system was isolated and inhibited. Since two of the four quads were now inoperative, it became necessary to redefine control modes, entry techniques, and deorbit procedures. Modifications to the procedures were quickly developed in the mission simulator... The Program Director elected to activate the Skylab Rescue Vehicle. This called for the personnel at the launch site to begin around-the-clock activities in the preparations for the next launch. (The preplanned rescue mode required the next in line mission to be launched with only two crewmen and with a specially designed rescue kit which permitted five crewmen to return to Earth. After launch, a normal rendezvous was to be followed by a docking at the rescue docking hatch located in the multiple docking adapter. After docking, the five crewmen were expected to enter the Command Module, separate from the workshop, and perform a normal reentry.)... On the tenth day of the second manned mission, the first of many extravehicular activities was performed to deploy the MSFC twin pole thermal shield over the parasol. As previously explained, the high-packing density needed for the parasol precluded the addition of coatings to prevent deterioration by ultraviolet radiation. Accelerated tests were conducted to determine the extent of the degradation, but the tests were inconclusive. After considerable debate, (the developers of the parasol were convinced it would last throughout the mission) the Program Director elected to follow the conservative course of action and cover the parasol with the new shield which had an adequate coating... The second mission proved, again, the versatility of man in that considerable unplanned and planned maintenance activities were conducted. The tape recorder, for example, was disassembled and repaired, circuit boards were replaced in the video tape recorder, and finally, during a second EVA, the drifting rate gyro package on the solar observatory was bypassed and replaced by a new package inside the docking adapter. The crew ...