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15 Years Ago: STS-127 Delivers Japanese External Platform to Space Station

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On July 15, 2009, space shuttle Endeavour began its 23rd trip into space, on the 2JA mission to the International Space Station, the 29th shuttle flight to the orbiting lab. During the 16-day mission, the seven-member STS-127 crew, working with Expedition 20, the first six-person crew aboard the station, completed the primary objectives of the mission. The flight marked the first time 13 people worked about the station at the same time. They added the Exposed Facility (EF) to the Kibo Japanese Experiment Module (JEM), including its first three payloads, and performed a crew exchange of long-duration crew members. The tasks involved five complex space walks and extensive robotic activities using three different manipulator systems during 11 days of docked operations.

The STS-127 crew patch Official photograph of the STS-127 crew of David A. Wolf, left, Christopher J. Cassidy, Douglas G. Hurley, Julie Payette of Canada, Mark L. Polansky, Thomas H. Marshburn, and Timothy L. Kopra The patch for the 2J/A mission
Left: The STS-127 crew patch. Middle: Official photograph of the STS-127 crew of David A. Wolf, left, Christopher J. Cassidy, Douglas G. Hurley, Julie Payette of Canada, Mark L. Polansky, Thomas H. Marshburn, and Timothy L. Kopra. Right: The patch for the 2J/A mission.

The seven-person STS-127 crew consisted of Commander Mark L. Polansky, Pilot Douglas G. Hurley, and Mission Specialists David A. Wolf, Christopher J. Cassidy, Julie Payette of the Canadian Space Agency (CSA), Thomas H. Marshburn, and Timothy L. Kopra. Primary objectives of the mission included the addition of the Exposed Facility (EF) to the Kibo Japanese Experiment Module (JEM) and the long-duration crew member exchange of Kopra for Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA), who had been aboard the space station since March 2009 as a member of Expeditions 18, 19, and 20.

The STS-127 crew during their preflight press conference at NASA’s Johnson Space Center in Houston The STS-127 payloads in Endeavour’s cargo bay at Launch Pad 39A at NASA’s Kennedy Space Center in Florida Space shuttle Endeavour on Launch Pad 39A a few days before launch
Left: The STS-127 crew during their preflight press conference at NASA’s Johnson Space Center in Houston. Middle: The STS-127 payloads in Endeavour’s cargo bay at Launch Pad 39A at NASA’s Kennedy Space Center in Florida. Right: Space shuttle Endeavour on Launch Pad 39A a few days before launch.

Endeavour returned from its previous mission, STS-126, on Nov. 28, 2008. It arrived in the Orbiter Processing Facility at NASA’s Kennedy Space Center (KSC) on Dec. 13, moved to the Vehicle Assembly Building on April 10, 2009, and rolled out to Launch Pad 39B seven days later to serve as the Launch on Need vehicle for STS-125 in May 2009. When that mission flew without issues, on May 31, workers rolled Endeavour around to Pad 39A to begin preparations for STS-127, planned for launch on June 13. A gaseous hydrogen leak scrubbed this first launch attempt. A similar leak halted the second attempt on June 17 and managers reset the launch date to July 11. Managers scrubbed that launch when 11 lightning strikes struck the launch pad area, requiring a review of Endeavour’s and ground systems. With the seven-member crew aboard Endeavour, weather once again halted the launch attempt on July 12. They tried again the next day, but weather conditions led to a fifth scrubbed launch attempt. The charm came on the sixth try.

Liftoff of space shuttle Endeavour on STS-127 carrying the Exposed Facility for the Japanese Kibo module
Liftoff of space shuttle Endeavour on STS-127 carrying the Exposed Facility for the Japanese Kibo module.

On July 15, 2009, at 6:03 p.m. EDT, space shuttle Endeavour lifted off from KSC’s Launch Pad 39A to begin its 23rd trip into space, beginning the 2JA mission to the space station. Eight and a half minutes later, Endeavour and its crew had reached orbit. This marked Wolf’s fourth time in space, Polansky’s third, Payette’s second, while Hurley, Cassidy, Marshburn, and Kopra enjoyed their first taste of true weightlessness.

NASA astronauts Timothy L. Kopra, left, and Thomas H. Marshburn enjoy the first few minutes of weightlessness after Endeavour reached orbit On the mission’s second day, the Shuttle Remote Manipulator System (SRMS) uses the Orbiter Boom Sensor System to image Endeavour’s Thermal Protection System (TPS) Canadian Space Agency astronaut Julie Payette operates the SRMS during the TPS inspection
Left: NASA astronauts Timothy L. Kopra, left, and Thomas H. Marshburn enjoy the first few minutes of weightlessness after Endeavour reached orbit. Middle: On the mission’s second day, the Shuttle Remote Manipulator System (SRMS) uses the Orbiter Boom Sensor System to image Endeavour’s Thermal Protection System (TPS). Right: Canadian Space Agency astronaut Julie Payette operates the SRMS during the TPS inspection.

After reaching orbit, the crew opened the payload bay doors and deployed the shuttle’s radiators, and removed their bulky launch and entry suits, stowing them for the remainder of the flight. The astronauts spent five hours on their second day in space conducting a detailed inspection of Endeavour’s nose cap and wing leading edges, with Payette operating the Shuttle Remote Manipulator System (SRMS), or robotic arm, and the Orbiter Boom Sensor System (OBSS).

NASA astronaut Christopher J. Cassidy uses a laser range finder during Endeavour’s rendezvous with the space station Endeavour as seen from the space station during the rendezvous Close up of the Kibo Japanese Experiment Module – the astronauts attached the Exposed Facility at the left end of the module
Left: NASA astronaut Christopher J. Cassidy uses a laser range finder during Endeavour’s rendezvous with the space station. Middle: Endeavour as seen from the space station during the rendezvous. Right: Close up of the Kibo Japanese Experiment Module – the astronauts attached the Exposed Facility at the left end of the module.

On July 17, the 34th anniversary of the Apollo-Soyuz Test Project docking, Polansky assisted by his crewmates brought Endeavour in for a docking with the space station. During the rendezvous, Polansky stopped the approach at 600 feet and completed the Rendezvous Pitch Maneuver so astronauts aboard the station could photograph Endeavour’s underside to look for any damage to the tiles. Shortly after docking, the crews opened the hatches between the two spacecraft and the six-person station crew welcomed the seven-member shuttle crew. Expedition 20 Commander Gennady I. Padalka of Roscosmos stated, “This is a remarkable event for the whole space program.” Polansky responded, “Thirteen is a big number, but we are thrilled to be here.” After exchanging Soyuz seat liners, Kopra joined the Expedition 20 crew and Wakata the STS-127 crew.

Expedition 20, the space station’s first six-person crew and the first, and so far only, time that each of the five space station partners had crew members on board at the same time The first time two Canadians were in space at the same time A medical convention in space – the first time four medical doctors flew in space at the same time
Left: Expedition 20, the space station’s first six-person crew and the first, and so far only, time that each of the five space station partners had crew members on board at the same time. Middle: The first time two Canadians were in space at the same time. Right: A medical convention in space – the first time four medical doctors flew in space at the same time.

STS-127 marked not only the first time that a space shuttle arrived at the station with a six-person crew living aboard, but as it happened, each of the five space station partners had a crew member aboard, a feat not repeated since. The flight also marked the first time that two CSA astronauts worked aboard the space station at the same time. And for the true trivia buffs, the mission marked the first time that four medical doctors worked in space together – an out of this world medical convention!

Transfer of the Exposed Facility from the shuttle to the station Timothy L. Kopra, left, and David A. Wolf work on the station’s truss during the mission’s first spacewalk Douglas G. Hurley, left, and Koichi Wakata of the Japan Aerospace Exploration Agency operate the station’s robotic arm during the first spacewalk
Left: Transfer of the Exposed Facility from the shuttle to the station. Middle: Timothy L. Kopra, left, and David A. Wolf work on the station’s truss during the mission’s first spacewalk. Right: Douglas G. Hurley, left, and Koichi Wakata of the Japan Aerospace Exploration Agency operate the station’s robotic arm during the first spacewalk.

On July 18, the mission’s fourth day, Hurley and Wakata grappled the JEM-EF using the Space Station Remote Manipulator System (SSRMS) or robotic arm, handed it off temporarily to the SRMS operated by Polansky and Payette, moved the station arm into position to grapple it again, and installed it on the end of the Kibo module. Meanwhile, Wolf, with red stripes on his spacesuit, and Kopra, wearing a suit with no stripes, began the mission’s first spacewalk. During the excursion that lasted 5 hours 32 minutes, Wolf and Kopra prepared the JEM for the EF installation and performed other tasks in the shuttle’s payload bay and on the station.

During the second spacewalk, David A. Wolf, left, and Thomas H. Marshburn transfer spare parts to the space station NASA astronaut Douglas G. Hurley, left, and Canadian Space Agency astronaut Julie Payette operate the station’s robotic arm during the second spacewalk
Left: During the second spacewalk, David A. Wolf, left, and Thomas H. Marshburn transfer spare parts to the space station. Right: NASA astronaut Douglas G. Hurley, left, and Canadian Space Agency astronaut Julie Payette operate the station’s robotic arm during the second spacewalk.

The mission’s fifth day involved internal transfers of equipment from the shuttle to the station and the robotic transfer of the Integrated Cargo Carrier (ICC) from the payload bay to the station truss. The ICC carried spare parts that the next day Wolf and Marshburn, wearing dashed red stripes on his spacesuit, transferred to a stowage platform on the station’s exterior during the mission’s second spacewalk, lasting 6 hours and 53 minutes.

An Apollo 11 Moon rock brought to the station to commemorate the 40th anniversary of the first Moon landing Nine of the 13 Expedition 20 and STS-127 crew members share a meal, as NASA astronaut Michael R. Barratt holds the Apollo 11 Moon rock Transfer of the Kibo Experiment Logistics Module from the shuttle to the station
Left: An Apollo 11 Moon rock brought to the station to commemorate the 40th anniversary of the first Moon landing. Middle: Nine of the 13 Expedition 20 and STS-127 crew members share a meal, as NASA astronaut Michael R. Barratt holds the Apollo 11 Moon rock. Right: Transfer of the Kibo Experiment Logistics Module from the shuttle to the station.

The second spacewalk took place on July 20, the 40th anniversary of Apollo 11 landing on the Moon. To commemorate the event, NASA selected a Moon rock returned on that mission and flew it to the space station on STS-119 in March 2009. Expedition 20 astronaut Michael Barratt recorded a video message about the Moon rock, played at a 40th anniversary celebration hosted by the National Air and Space Museum in Washington, D.C., and attended by the Apollo 11 astronauts. The following day, the joint crews continued their work by robotically transferring the JEM Experiment Logistics Module (JEM ELM) and temporarily installing it on the Exposed Facility. Later in the mission, astronauts robotically transferred the three payloads from the ELM to EF.

Christopher J. Cassidy, left, and David A. Wolf during the mission’s third spacewalk Cassidy, left, and Wolf during a battery changeout
Left: Christopher J. Cassidy, left, and David A. Wolf during the mission’s third spacewalk. Right: Cassidy, left, and Wolf during a battery changeout.

Flight Day 8 saw the mission’s third spacewalk, with Wolf making his final excursion, this time accompanied by Cassidy, wearing diagonal red stripes on his suit. Prior to the start of the spacewalk, Hurley and Payette used the station’s arm to relocate the ICC to a different workstation for Wolf and Cassidy to transfer the batteries to the station. As their first task, Wolf and Cassidy prepared the JEM EF for the transfer of the three payload the following day. They managed to transfer two of the four batteries before mission managers decided to shorten the spacewalk due to a slight buildup of carbon dioxide in Cassidy’s suit. The excursion lasted 5 hours and 59 minutes.

Installation of one of the payloads onto the Kibo Exposed Facility (EF) Mark J. Polansky, left, and Koichi Wakata of the Japan Aerospace Exploration Agency, one of the three teams that transferred the EF payloads using Kibo’s robotic arm
Left: Installation of one of the payloads onto the Kibo Exposed Facility (EF). Right: Mark J. Polansky, left, and Koichi Wakata of the Japan Aerospace Exploration Agency, one of the three teams that transferred the EF payloads using Kibo’s robotic arm.

On Flight Day 9, Wakata, assisted by Kopra, inaugurated the operational use of the JEM’s robotic arm by transferring the first payload from the ELM to the EF. Three separate two-person teams transferred each of the three payloads.

Christopher J. Cassidy, left, and Thomas H. Marshburn exchange space station batteries during the mission’s fourth spacewalk Canadian Space Agency astronaut Julie Payette, left, and NASA astronaut Douglas G. Hurley operate the station’s robotic arm during the fourth spacewalk
Left: Christopher J. Cassidy, left, and Thomas H. Marshburn exchange space station batteries during the mission’s fourth spacewalk. Right: Canadian Space Agency astronaut Julie Payette, left, and NASA astronaut Douglas G. Hurley operate the station’s robotic arm during the fourth spacewalk.

On Flight Day 10, Marshburn and Cassidy transferred the remaining four batteries and completed other tasks during the mission’s fourth spacewalk, lasting 7 hours and 12 minutes. Following the battery transfers, Hurley and Payette used the station’s arm to transfer the ICC to Polansky and Hurley operating the shuttle arm, who then stowed it in Endeavour’s payload bay.

The Seattle-Tacoma area The central Florida coast including NASA’s Kennedy Space Center Sicily with Mt. Etna, left, and the “toe” of Italy at right Istanbul straddling Europe, left, and Asia
Left: The Seattle-Tacoma area. Middle left: The central Florida coast including NASA’s Kennedy Space Center. Middle right: Sicily with Mt. Etna, left, and the “toe” of Italy at right. Right: Istanbul straddling Europe, left, and Asia.

With Flight Day 11 given as a crew off duty day, many of the astronauts took part in a favorite activity: looking at and photographing the Earth. They also used the time to catch up on other activities.

Return of the empty Exposed Logistics Module to Endeavour’s payload bay Fisheye view of Christopher J. Cassidy, left, and Thomas H. Marshburn in the U.S. Airlock preparing for the mission’s fifth and final spacewalk Marshburn, left, and Cassidy install cameras on the Kibo Exposed Facility during the fifth and final spacewalk
Left: Return of the empty Exposed Logistics Module to Endeavour’s payload bay. Middle: Fisheye view of Christopher J. Cassidy, left, and Thomas H. Marshburn in the U.S. Airlock preparing for the mission’s fifth and final spacewalk. Right: Marshburn, left, and Cassidy install cameras on the Kibo Exposed Facility during the fifth and final spacewalk.

First thing on Flight Day 12, Payette and Polansky returned the now empty ELM to Endeavour’s payload bay, using the station and shuttle robotic arms. The next day, Marshburn and Cassidy teamed up again for the flight’s fifth and final spacewalk. During the 4-hour 54-minute excursion, they installed a pair of cameras on the Kibo module to help guide future H-II Transfer Vehicle (HTV) cargo spacecraft, the first planned to arrive in September 2009. They also completed a few get ahead tasks. Their excursion brought the total spacewalking time for the mission to 30 hours 30 minutes and marked only the second time that a shuttle mission to the space station completed five spacewalks.

The 13 members of Expedition 20 and STS-127 pose for a final photograph before saying their farewells The crew members exchange farewells, with Koichi Wakata of the Japan Aerospace Exploration Agency, left, appearing a little reluctant to leave after spending 133 days aboard the space station Photograph of the newly installed Exposed Facility on the Kibo Japanese Experiment Module
Left: The 13 members of Expedition 20 and STS-127 pose for a final photograph before saying their farewells. Middle: The crew members exchange farewells, with Koichi Wakata of the Japan Aerospace Exploration Agency, left, appearing a little reluctant to leave after spending 133 days aboard the space station. Right: Photograph of the newly installed Exposed Facility on the Kibo Japanese Experiment Module.

On July 28, the mission’s 14th day, the 13-member joint crew held a brief farewell ceremony, parted company, and closed the hatches between the two spacecraft. With Hurley at the controls, Endeavour undocked from the space station, having spent nearly 11 days as a single spacecraft. Hurley completed a flyaround  of the station, with the astronauts photographing it to document its condition. A final separation burn sent Endeavour on its way.

The International Space Station, with the newly added Exposed Facility and its first payloads, as seen from Endeavour during the departure flyaround. Endeavour casts its shadow on the solar arrays
The International Space Station, with the newly added Exposed Facility and its first payloads, as seen from Endeavour during the departure flyaround. Endeavour casts its shadow on the solar arrays.

The shuttle’s robotic arm grapples the Orbiter Boom Sensor System for the late inspection of Endeavour’s heat shield Deploy of the DRAGONSAT microsatellite Deploy of the ANDE microsatellites
Left: The shuttle’s robotic arm grapples the Orbiter Boom Sensor System for the late inspection of Endeavour’s heat shield. Middle: Deploy of the DRAGONSAT microsatellite. Right: Deploy of the ANDE microsatellites.

The next day, Polansky, Payette, and Hurley used the shuttle’s arm to pick up the OBSS and perform a late inspection of Endeavour’s thermal protection system. On Flight Day 16, the astronauts deployed two satellites. The first, called Dual RF Astrodynamic GPS Orbital Navigation Satellite, or DRAGONSAT, designed by students at the University of Texas, Austin, and Texas A&M University, College Station, consisted of a pair of picosatellites to look at independent rendezvous of spacecraft using GPS. The second, called Atmospheric Neutral Density Experiment-2, or ANDE-2, consisted of a set of Department of Defense microsatellites to look at the density and composition of the atmosphere 200 miles above the Earth. Polansky and Hurley tested Endeavour’s reaction control system thrusters and flight control surfaces in preparation for the next day’s entry and landing. The entire crew busied themselves with stowing all unneeded equipment.

Endeavour touches down on the Shuttle Landing Facility at NASA’s Kennedy Space Center in Florida The welcome home ceremony for the STS-127 crew at Ellington Field in Houston
Left: Endeavour touches down on the Shuttle Landing Facility at NASA’s Kennedy Space Center in Florida. Right: The welcome home ceremony for the STS-127 crew at Ellington Field in Houston.

On July 31, the astronauts closed Endeavour’s payload bay doors, donned their launch and entry suits, and strapped themselves into their seats, a special recumbent seat for Wakata who had spent the last four months in weightlessness. Polansky fired Endeavour’s two Orbital Maneuvering System engines to bring them out of orbit and heading for a landing half an orbit later. He guided Endeavour to a smooth touchdown at KSC’s Shuttle Landing Facility, capping off a very successful STS-127 mission of 15 days, 16 hours, 45 minutes. They orbited the planet 248 times. Wakata spent 137 days, 15 hours, 4 minutes in space, completing 2,166 orbits of the Earth. Workers at KSC began preparing Endeavour for its next flight, STS-130 in February 2010.

Enjoy the crew narrate a video about the STS-127 mission.

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      On Aug. 30, 1984, space shuttle Discovery lifted off on the STS-41D mission, joining NASA’s fleet as the third space qualified orbiter. The newest shuttle incorporated newer technologies making it significantly lighter than its two predecessors. Discovery lofted the heaviest payload up to that time in shuttle history. The six-person crew included five NASA astronauts and the first commercial payload specialist. During the six-day mission, the crew deployed a then-record three commercial satellites, tested an experimental solar array, and ran a commercial biotechnology experiment. The astronauts recorded many of the activities using a large format film camera, the scenes later incorporated into a motion picture for public engagement. The mission marked the first of Discovery’s 39 trips to space, the most of any orbiter.

      Left: Space shuttle Discovery rolls out of Rockwell’s Palmdale, California, facility. Middle: Discovery atop the Shuttle Carrier Aircraft during the cross-country ferry flight. Right: Discovery arrives at NASA’s Kennedy Space Center in Florida.
      Space shuttle Discovery, the third space-qualified orbiter in NASA’s fleet and named after several historical ships of exploration, incorporated manufacturing lessons learned from the first orbiters. In addition, through the use of more advanced materials, the new vehicle weighed nearly 8,000 pounds less than its sister ship Columbia and 700 pounds less than Challenger. Discovery rolled out of Rockwell International’s plant in Palmdale, California, on Oct. 16, 1983. Five of the six crew members assigned to its first flight attended the ceremony. Workers trucked Discovery overland from Palmdale to NASA’s Dryden, now Armstrong, Flight Research Center at Edwards Air Force Base (AFB), where they mounted it atop a Shuttle Carrier Aircraft (SCA), a modified Boeing 747, for the transcontinental ferry flight to NASA’s Kennedy Space Center (KSC) in Florida. Discovery arrived at KSC on Nov. 9 following a two-day stopover at Vandenberg Air Force, now Space Force Base, in California.

      Left: STS-41D crew patch. Middle: Official photograph of the STS-41D crew of R. Michael “Mike” Mullane, front row left, Steven A. Hawley, Henry “Hank” W. Hartsfield, and Michael L. Coats; Charles D. Walker, back row left, and Judith A. Resnik. Right: Payloads installed in Discovery’s payload bay for the STS-41D mission include OAST-1, top, SBS-4, Telstar 3C, and Leasat-2.
      To fly Discovery’s first flight, originally designated STS-12 and later renamed STS-41D, in February 1983 NASA assigned Commander Henry W. Hartsfield, a veteran of STS-4, and first-time flyers Pilot Michael L. Coats, and Mission Specialists R. Michael Mullane, Steven A. Hawley, and Judith A. Resnik, all from the 1978 class of astronauts and making their first spaceflights. In May 1983, NASA announced the addition of Charles D. Walker, an employee of the McDonnell Douglas Corporation, to the crew, flying as the first commercial payload specialist. He would operate the company’s Continuous Flow Electrophoresis System (CFES) experiment. The mission’s primary payloads included the Leasat-1 (formerly known as Syncom IV-1) commercial communications satellite and OAST-1, three experiments from NASA’s Office of Aeronautics and Space Technology, including the Solar Array Experiment, a 105-foot long lightweight deployable and retractable solar array. Following the June 1984 launch abort, NASA canceled the STS-41F mission, combining its payloads with STS-41D’s, resulting in three communications satellites – SBS-4 for Small Business Systems, Telstar 3C for AT&T, and Leasat 2 (Syncom IV-2) for the U.S. Navy – launching on the flight. The combined cargo weighed 41,184 pounds, the heaviest of the shuttle program up to that time. A large format IMAX® camera, making its second trip into space aboard the shuttle, flew in the middeck to film scenes inside the orbiter and out the windows.

      Left: First rollout of Discovery from the Vehicle Assembly Building at NASA’s Kennedy Space Center in Florida. Right: The June 26 launch abort.
      The day after its arrival at KSC, workers towed Discovery to the Orbiter Processing Facility (OPF) to begin preparing it for its first space flight. They towed it to the Vehicle Assembly Building (VAB) on May 12, 1984, for mating with its External Tank (ET) and Solid Rocket Boosters (SRBs). The completed stack rolled out to Launch Pad 39A a week later. On June 2, engineers successfully completed an 18-second Flight Readiness Firing of Discovery’s main engines. Post test inspections revealed a debonding of a thermal shield in main engine number 1’s combustion chamber, requiring its replacement at the pad. The work pushed the planned launch date back three days to June 25. The failure of the shuttle’s backup General Purpose Computer (GPC) delayed the launch by one day. The June 26 launch attempt ended just four seconds before liftoff, after two of the main engines had already ignited. The GPC detected that the third engine had not started and shut all three down. It marked the first time a human spaceflight launch experienced an abort after the start of its engines since Gemini VI in October 1965. The abort necessitated a rollback to the VAB on July 14 where workers demated Discovery from the ET and SRBs. Engineers replaced the faulty engine, and Discovery rolled back out to the launch pad on Aug. 9 for another launch attempt. The six-person crew participated in the Terminal Countdown Demonstration Test, essentially a dress rehearsal for the actual countdown to launch, on Aug. 15. A software issue delayed the first launch attempt on Aug. 29 by one day.

      Left: The STS-41D crew pose at Launch Pad 39A at NASA’s Kennedy Space Center in Florida following the Terminal Countdown Demonstration Test. Right: Liftoff of Discovery on the STS-41D mission.
      Finally, on Aug. 30, 1984, Discovery roared off its launch pad on a pillar of flame and within 8 and a half minutes entered orbit around the Earth. The crew got down to work and on the first day Mullane and Hawley deployed the SBS-4 satellite. On the second day in space, they deployed Leasat, the first satellite designed specifically to be launched from the shuttle. On the third day, they deployed the Telstar satellite, completing the satellite delivery objectives of the mission. Resnik deployed the OAST-1 solar array to 70% of its length to conduct dynamic tests on the structure. On the fourth day, she deployed the solar array to its full length and successfully retracted it, completing all objectives for that experiment.

      The deployment of the SBS-4, left, Leasat-2, and Telstar 3C satellites during STS-41D.
      Walker remained busy with the CFES, operating the unit for about 100 hours, and although the experiment experienced two unexpected shutdowns, he processed about 85% of the planned samples. Hartsfield and Coats exposed two magazines and six rolls of IMAX® film, recording OAST-1 and satellite deployments as well as in-cabin crew activities. Clips from the mission appear in the 1985 IMAX® film “The Dream is Alive.” On the mission’s fifth day, concern arose over the formation of ice on the orbiter’s waste dump nozzle. The next day, Hartsfield used the shuttle’s robotic arm to dislodge the large chunk of ice.

      Left: Payload Specialist Charles D. Walker in front of the Continuous Flow Experiment System. Middle: Henry “Hank” W. Hartsfield loading film into the IMAX® camera. Right: The OAST-1 Solar Array Experiment extended from Discovery’s payload bay.
      On Sep. 5, the astronauts closed Discovery’s payload bay doors in preparation for reentry. They fired the shuttle’s Orbital Maneuvering System engines to slow their velocity and begin their descent back to Earth. Hartsfield guided Discovery to a smooth landing at Edwards AFB in California, completing a flight of 6 days and 56 minutes. The crew had traveled 2.5 million miles and orbited the Earth 97 times.

      Left: The STS-41D crew pose in Discovery’s middeck. Right: Space shuttle Discovery makes a perfect landing at Edwards Air Force Base in California to end the STS-41D mission. 
      By Sept. 10, workers had returned Discovery to KSC to prepare it for its next mission, STS-51A, in November 1984. During its lifetime, Discovery flew a fleet leading 39 missions, making its final trip to space in February 2011. It flew both return to flight missions, STS-26 in 1988 and STS-114 in 2005. It launched the Hubble Space Telescope in 1990 and flew two of the missions to service the facility. Discovery flew two mission to Mir, docking once. It completed the first docking to the International Space Station in 1999 and flew a total of 13 assembly and resupply missions to the orbiting lab. By its last mission, Discovery had traveled 149 million miles, completed 5,830 orbits of the Earth, and spent a cumulative 365 days in space in the span of 27 years. The public can view Discovery on display at the National Air and Space Museum’s Stephen F. Udvar-Hazy Center in Chantilly, Virginia.
      Read recollections of the STS-41D mission by Hartsfield, Coats, Mullane, Hawley, and Walker in their oral histories with the JSC History Office. Enjoy the crew’s narration of a video about the STS-41D mission.
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