page_title: Skylab 2
section_title: Mission highlights
hierarchical_section_title: Skylab 2 / Mission highlights
caption_attribution_description: English: A view of the Skylab 1 space station Orbital Workshop showing the micrometeoroid shield missing. A parasol solar shield was later deployed to shade this exposed area. This picture was taken from the Skylab 2 Command/Service Module during its "fly around" inspection. The Apollo Telescope Mount is in the background. The damaged and partially deployed OWS solar array system wing is at upper right. After an aluminum strapping was cut during the June 7th extravehicular activity, the solar panel fully deployed. The OWS solar panel on the opposite side was completely ripped off during the Skylab 1 launch on May 14th leaving only cables and tubing.
context_page_description: Skylab 2 was the first crewed mission to Skylab, the first U.S. orbital space station. The mission was launched on an Apollo command and service module by a Saturn IB rocket on May 25, 1973, and carried a three-person crew to the station. The name Skylab 2 also refers to the vehicle used for that mission. The Skylab 2 mission established a twenty-eight-day record for human spaceflight duration. Furthermore, its crew were the first space station occupants ever to return safely to Earth – the only previous space station occupants, the crew of the 1971 Soyuz 11 mission that had crewed the Salyut 1 station for twenty-four days, died upon reentry due to unexpected cabin depressurization.
  The crewed Skylab missions were officially designated Skylab 2, 3, and 4. Miscommunication about the numbering resulted in the mission emblems reading "Skylab I", "Skylab II", and "Skylab 3" respectively.
context_section_description: The Skylab station suffered significant damage on its May 14 launch: its micrometeorite shield, and one of its primary solar arrays had torn loose during launch, and the remaining primary solar array was jammed. Without the shield which was designed to also provide thermal protection, Skylab baked in the Sun, and rising temperatures inside the workshop released toxic materials into the station's atmosphere and endangered on-board film and food. The first crew was supposed to launch on May 15, but instead had to train practicing repair techniques as they were developed by the engineers. Ground controllers purged the atmosphere with pure nitrogen four times, before refilling it with the nitrogen/oxygen atmosphere for the crew. The secret National Reconnaissance Office used a KH-8 Gambit 3 to photograph the damaged station.
  On May 25, Skylab 2 lifted from LC-39B, the first Saturn IB launch in almost five years and only the second-ever launch from Pad 39B. Booster performance was nominal except for one momentary glitch that could have threatened the mission - when the Commit signal was sent to the Saturn at ignition, the instrument unit sent a command to switch the launch vehicle from internal to external power. This would have shut down the Saturn's electrical system, but not the propulsion system and likely cause the disaster scenario of an uncontrollable booster, requiring the Launch Escape System to be activated and the Command Module pulled away to safety, followed by Range Safety destroying the errant launch vehicle. However, the duration of the cutoff signal was less than one second, too short a time for the electrical relay in the booster to be activated, thus nothing happened and the launch proceeded as planned. This glitch was traced to a modification of the pad electrical equipment and corrective steps were subsequently taken to prevent it from happening again. On reaching the station, Conrad flew their Apollo Command/Service Module (CSM) around it to inspect the damage, then soft-docked with it to avoid the necessity of station keeping while the crew ate, and flight controllers planned the first repair attempt. Then they undocked so that Conrad could position the Apollo by the jammed solar panel, so that Weitz could perform a stand-up EVA, trying to free the array by tugging at it with a 10-foot hooked pole, while Kerwin held onto his legs. This failed, and consumed a significant amount of the Skylab's nitrogen maneuvering fuel to keep it steady in the process.
  The crew then attempted to perform the hard dock to Skylab, but the capture latches failed to operate. After eight failed attempts, they donned their pressure suits again and partially dis-assembled the CSM's docking probe; the next attempt worked. Once inside the station, the crew deployed a collapsible parasol through the small scientific airlock to act as a sunshade. (This approach was suggested and designed by NASA's "Mr. Fix It" Jack Kinzler, who was awarded the NASA Distinguished Service Medal for the effort.)  Successful deployment of the sunshade dropped inside temperatures to sustainable levels.
  Two weeks later, Conrad and Kerwin performed a second EVA, finally freeing the stuck solar panel and increasing the electrical power to the workshop. They had prepared for this repair by practicing in the Neutral Buoyancy Simulator at the Marshall Space Flight Center. Without power from the panel, the second and third Skylab missions would have been unable to perform their main experiments, and the station's critical battery system would have been seriously degraded.  During this EVA, the sudden deployment of the solar panel structure caused both astronauts to be flung from the station's hull, testing their nerves as well as the strength of their safety tethers.  After recovering their composure, both astronauts returned to their positions on the station and completed the EVA.
  For nearly a month they made further repairs to the workshop, conducted medical experiments, gathered solar and Earth science data, and performed a total of 392 hours of experiments.
caption: View during a "fly around" inspection
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