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This is a Space Shuttle STS-100 mission onboard photograph. Astronaut Scott Parazynski totes a Direct Current Switching Unit while anchored on the end of the Canadian-built Remote Manipulator System (RMS) robotic arm. The RMS is in the process of moving Parazynski to the exterior of the Destiny laboratory (right foreground), where he will secure the spare unit, a critical part of the station's electrical system, to the stowage platform in case future crews will need it. Also in the photograph are the Italian-built Raffaello multipurpose Logistics Module (center) and the new Canadarm2 (lower right) or Space Station Remote Manipulator System.
S84-27018 (7 Feb 1984) --- Astronaut Bruce McCandless II approaches his maximum distance from the Earth-orbiting Space Shuttle Challenger in this 70mm frame photographed by his fellow crewmembers onboard the reusable vehicle.  McCandless is in the midst of the first "field" tryout of the nitrogen-propelled, hand-controlled back-pack device called the manned maneuvering unit (MMU).  Astronaut Robert L. Stewart got a chance to test the same unit a while later in the lengthy EVA session while the two spacewalkers were photographed and monitored by their fellow crewmembers in Challenger's cabin.  Those inside were Astronauts Vance D. Brand, Robert L. Gibson and Dr. Ronald E. McNair.
JSC2009-E-240471 (5 Nov. 2009) --- An empty Extravehicular Mobility Unit (EMU) spacesuit is photographed prior to a fit check with astronaut Clayton Anderson (out of frame), STS-131 mission specialist, in the Space Station Airlock Test Article (SSATA) in the Crew Systems Laboratory at NASA's Johnson Space Center.
S84-27023 (7 Feb 1984) --- This 70mm frame shows astronaut Bruce McCandless II moving in to conduct a test involving the Trunion Pin Attachment Device (TPAD) he carries and the Shuttle Pallet Satellite (SPAS-01A) partially visible at bottom of frame. SPAS was a stand-in for the damaged Solar Maximum Satellite (SMS) which will be visited for repairs by the STS-41C Shuttle crew in early spring.  This particular Extravehicular Activity (EVA) session was a rehearsal for the SMS visit. The test and the actual visit to the SMS both involve the use of jet-powered, hand-controlled Manned Maneuvering Unit (MMU). The one McCandless uses is the second unit to be tested on this flight. Astronaut Robert L. Stewart got a chance to work with both MMU's on the two EVA's.
STS097-373-005 (3 December 2000) --- Backdropped against the blackness of space, the deployment of International Space Station (ISS) solar array was photographed with a 35mm camera by astronaut Carlos I. Noriega, mission specialist.  Part of the extravehicular mobility unit (EMU) attached to astronaut Joseph R. Tanner, mission specialist, is visible at bottom center. Tanner and Noriega went on to participate together in three separate space walks.
STS082-752-020 (11-21 Feb. 1997) --- Astronaut Mark C. Lee, standing on the end of the Remote Manipulator System (RMS), works at the data interface unit on the Hubble Space Telescope (HST), temporarily captured in the cargo bay of the Earth-orbiting the Space Shuttle Discovery. This third space walk or Extravehicular Activity (EVA) of the mission took place on Flight Day 6, with astronauts Lee, payload commander, and Steven L. Smith, mission specialist, serving as the suited EVA participants.
Test engineers monitor an engine firing from the control room of the Rocket Engine Test Facility at the National Advisory Committee for Aeronautics (NACA) Lewis Flight Propulsion Laboratory. The Rocket Engine Test Facility, built in the early 1950s, had a rocket stand designed to evaluate high-energy propellants and rocket engine designs. The facility was used to study numerous different types of rocket engines including the Pratt and Whitney RL-10 engine for the Centaur rocket and Rocketdyne’s F-1 and J-2 engines for the Saturn rockets.    The Rocket Engine Test Facility was built in a ravine at the far end of the laboratory because of its use of the dangerous propellants such as liquid hydrogen and liquid fluorine. The control room was located in a building 1,600 feet north of the test stand to protect the engineers running the tests. The main control and instrument consoles were centrally located in the control room and surrounded by boards controlling and monitoring the major valves, pumps, motors, and actuators. A camera system at the test stand allowed the operators to view the tests, but the researchers were reliant on data recording equipment, sensors, and other devices to provide test data.    The facility’s control room was upgraded several times over the years. Programmable logic controllers replaced the electro-mechanical control devices. The new controllers were programed to operate the valves and actuators controlling the fuel, oxidant, and ignition sequence according to a predetermined time schedule.
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