page_title: Getaway Special
section_title: Requirements
hierarchical_section_title: Getaway Special / Requirements
caption_attribution_description: English: Processing activities for STS-91 continue in KSC's Orbiter Processing Facility Bay 2. The payload bay of Space Shuttle Discovery is relatively empty as installation of the Get Away Special (GAS) canisters begins. Two GAS canisters can be seen in the center of the photograph. On the left is G-648, a Canadian Space Agency-sponsored study on manufactured organic thin film by the physical vapor transport method, and on the right is a can with hundreds of commemorative flags to be flown on the mission. STS-91 is scheduled to launch aboard the Space Shuttle Discovery for the ninth and final docking with the Russian Space Station Mir from KSC's Launch Pad 39A on June 2 with a launch window opening around 6:04 p.m. EDT.
context_page_description: Getaway Special was a NASA program that offered interested individuals, or groups, opportunities to fly small experiments aboard the Space Shuttle. Over the 20-year history of the program, over 170 individual missions were flown. The program, which was officially known as the Small, Self-Contained Payloads program, was canceled following the Space Shuttle Columbia disaster on February 1, 2003.
context_section_description: There were no stringent requirements to qualify for participation in the GAS program. However, each payload was required to meet specific safety criteria, have been screened for its propriety, as well as being evaluated for its educational, scientific or technological objectives. These guidelines preclude commemorative items, such as medallions, that are intended for sale as objects that have flown in space. NASA's Space Shuttle program had specific standards and conditions relating to GAS payloads. Payloads were required to have fit into NASA standard containers and weigh no more than 200 pounds (91 kg). Two or more experiments could have been included in a single container if they fit while not exceeding weight limitations. The payload must have been self-powered, as experiments could not draw on the Shuttle orbiter's electricity. In addition, the crew's involvement with GAS payloads was limited to six simple activities (such as turning on and off up to three payload switches), due to the fact that crew activity schedules do not provide opportunities to either monitor or service GAS payloads in flight.
  The cost of this unique service depended on the size and weight of the experiment. Getaway specials of 200 pounds (91 kg) and 5 cubic feet (0.14 m³) cost $10,000; 100 pounds (45 kg) and 2.5 cubic feet (0.071 m³), $5,000; and 60 pounds (27 kg) and 2.5 cubic feet (0.071 m³), $3,000. The weight of the GAS container, experiment mounting plate and its attachment screws, and all hardware regularly supplied by NASA was not charged to the experimenter's weight allowance.
  The GAS container provided internal pressure, which could be varied from near vacuum to about one atmosphere. The bottom and sides of the container were always thermally insulated, and the top may have been insulated or not, depending on the specific experiment. A lid that could be opened, or one with a window, may be required, and were offered as options at additional cost. The GAS containers were made of aluminum, and the circular end plates are ⁵⁄₈ inch (16 mm) thick aluminum. The bottom 3 inches (76 mm) of the container were reserved for NASA interface equipment, such as command decoders and pressure regulating systems. The container was a pressure vessel that could be evacuated before or during launch, or on orbit, and could be re-pressurized during re-entry, or on orbit, as required by the experimenter.
  The getaway bridge, which was capable of holding 12 canisters, made its maiden flight on STS-61-C. The aluminum bridge fit across the payload bay of the orbiter and offered a convenient and economic way of flying several GAS canisters.
caption: GAS canisters shown mounted in the Space Shuttle Discovery cargo bay. This image is from STS-91. The front of the Shuttle is to the left of the picture.
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