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By NASA
NASA’s T-38 jets fly in formation above the Space Launch System rocket on Launch Pad 39B at NASA’s Kennedy Space Center.
Aircraft designations and passengers:
901: Chris Condon / Astronaut Zena Cardman.
902: Astronaut Candidate Nicole Ayers / Astronaut Christina Koch.
903: Canadian Space Agency Astronaut Jeremy Hansen / Astronaut Drew Morgan.
904: Chief Astronaut Reid Wiseman / Astronaut Joe Acaba.
905 (Photo Chase): Astronaut Candidate Jack Hathaway / Josh Valcarcel
Image Credit: NASA/Josh Valcarcel
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By NASA
On July 23, 1979, space shuttle Enterprise completed its time as a pathfinder vehicle at Launch Pad 39A at NASA’s Kennedy Space Center (KSC) in Florida. Workers towed it back to the Vehicle Assembly Building (VAB). During its four-month stay at KSC, Enterprise validated procedures for the assembly of the space shuttle stack and interfaces at the launch pad. The tests proved valuable in preparing space shuttle Columbia for its first orbital mission in 1981. Earlier, Enterprise proved the flight worthiness of the shuttle during atmospheric tests and certified the vehicle’s structure to handle launch loads. Later, Enterprise supported the Challenger and Columbia accident investigations. Following a restoration, Enterprise went on public display, first near Washington, D.C., and then in New York City where it currently resides.
Left: NASA Administrator James C. Fletcher, left, poses with several cast members and creator of the TV series “Star Trek” at Enterprise’s rollout. Middle: Enterprise moments after release from the back of the Shuttle Carrier Aircraft during the first Approach and Landing Test free flight. Right: At NASA’s Marshall Space Flight Center in Huntsville, Alabama, for vibration tests, a shuttle orbiter joins an External Tank and twin Solid Rocket Boosters for the first time.
On Jan. 5, 1972, President Richard M. Nixon directed NASA to build the reusable space shuttle, formally called the Space Transportation System (STS). Manufacture of the first components of Orbital Vehicle-101 (OV-101) at the North American Rockwell Corporation’s plant in Downey, California, began on June 4, 1974. This first vehicle, designed for ground and atmospheric flight tests, received the name Enterprise, following a dedicated write-in campaign by fans of the television science fiction series “Star Trek.” Enterprise rolled out of Rockwell’s Palmdale facility on Sept. 17, 1976. In January 1977, workers trucked Enterprise 36 miles overland from Palmdale to NASA’s Dryden, now Armstrong, Flight Research Center at Edwards Air Force Base (AFB) in California, for the Approach and Landing Tests (ALT), a series of increasingly complex flights to evaluate the shuttle’s air worthiness. At Dryden, workers placed Enterprise on the back of the Shuttle Carrier Aircraft (SCA), a modified Boeing 747. The duo began taxi runs in February, followed by the first captive inactive flight later that month. The first captive active flight with a crew aboard the orbiter took place in June, and Enterprise made its first independent flight on Aug. 12. Four additional approach and landing flights completed the ALT program by October. In March 1978, Enterprise began its first cross-country trip from Edwards to the Redstone Arsenal’s airfield in Huntsville, Alabama. Workers trucked Enterprise to the adjacent NASA Marshall Space Flight Center where engineers for the first time mated it with an External Tank (ET) and inert Solid Rocket Boosters (SRB) in the Dynamic Structural Test Facility. For the next year, engineers conducted a series of vibration tests on the combined vehicle, simulating conditions expected during an actual launch.
Left: Enterprise atop its Shuttle Carrier Aircraft (SCA) touches down on the runway at NASA’s Kennedy Space Center in Florida. Middle: Workers remove Enterprise from the SCA in the Mate-Demate Device. Right: Workers tow Enterprise into the Vehicle Assembly Building.
Left: At NASA’s Kennedy Space Center in Florida, workers in the Vehicle Assembly Building prepare to lift Enterprise. Middle: Enterprise in the vertical position. Right: Workers lower Enterprise for attachment to the External Tank and Solid Rocket Boosters.
Following the year-long series of tests at Marshall, on April 10, 1979, NASA ferried Enterprise atop its SCA to KSC. Workers at the SLF removed the orbiter from the back of the SCA in the Mate-Demate Device,and towed it into High Bay 3 of the VAB where on April 25 they completed attaching it to an ET and inert SRBs on a Mobile Launch Platform (MLP) repurposed from carrying Saturn rockets. These activities enabled verification of towing, assembly, and checkout procedures. Since the Apollo and Skylab programs, engineers had made many significant modifications to Launch Pads 39A and 39B to accommodate the space shuttle. Among these included the addition of a fixed launch tower, accommodations for payload handling, and a mobile service structure for access to the vehicle.
Left: Enterprise exiting the Vehicle Assembly Building at NASA’s Kennedy Space Center in Florida. Middle: Enterprise on its Mobile Launch Platform during the rollout to the pad. Right: Enterprise at Launch Pad 39A.
Rollout of Enterprise from the VAB to Launch Pad 39A occurred on May 1, and its arrival marked the first time that a vehicle stood on that facility since the Skylab 1 space station launch in May 1973. The assembled vehicle including the MLP weighed about 11 million pounds. Technicians drove the stack atop the Crawler Transporter at varying speeds to determine the optimum velocity to minimize vibration stress on the vehicle. The 3.5-mile rollout took about eight hours to complete. Once at the pad, engineers used Enterprise to conduct fit checks and to validate launch pad procedures. During the critical countdown demonstration test, workers filled the ET with super-cold liquid hydrogen and liquid oxygen. The significant discovery that ice built up at the top of the ET during this process led to the addition of the gaseous oxygen vent hood (familiarly known as the “beanie cap”) to the launch pad facility and a procedure to retract it just a few minutes before liftoff. This prevented the dangerous buildup of ice during the countdown and ranks as perhaps one of Enterprise’s greatest contributions as a test vehicle during its time at the launch pad.
Left: Engineer Richard W. Nygren poses in front of Enterprise at Launch Pad 39A with astronauts Richard H. Truly, John W. Young, Robert L. Crippen, and Joe H. Engle, the prime and backup crews assigned to STS-1, the first space shuttle mission. Middle left: Pilot’s eye view of the launch tower looking up through Enterprise’s forward windows. Middle right: Enterprise rolls back into the Vehicle Assembly Building. Right: Enterprise departs NASA’s Kennedy Space Center in Florida atop the Shuttle Carrier Aircraft.
On July 23, after three months of fit checks and testing, workers rolled Enterprise back from Launch Pad 39A to the VAB’s High Bay 1. The activities conducted at the pad proved instrumental in paving the way for its sister ship Columbia to make its first launch in 1981. John Bell, who managed the activities at KSC said of the test program, “Overall, it was a very successful venture and well worth it.” Launch Pad 39A Site Manager John J. “Tip” Talone added, “Having [Enterprise] out here really saved the program a lot of time in getting things ready for [Columbia].” In the VAB, workers removed Enterprise from its ET on July 25 and towed it to the SLF on Aug. 3 where it awaited the arrival of the SCA. The ferry flight back to Dryden took place Aug. 10-16, making six stops along the way – Atlanta, St. Louis, Tulsa, Denver, Salt Lake City, and Vandenberg AFB in California. Up to 750,000 people came out to see the orbiter and SCA. Back at Dryden, workers demated Enterprise and on Oct. 30 trucked it back to the Palmdale plant where engineers removed computers and instruments to be refurbished and used in other orbiters then under construction. Previous plans to convert Enterprise into an orbital vehicle proved too costly and NASA abandoned the idea.
Left: Enterprise as the backdrop for President Ronald W. Reagan welcomes home the STS-4 crew at NASA’s Dryden, now Armstrong, Flight Research Center in July 1982. Middle: Enterprise on display at the World’s Fair in New Orleans in 1984. Right: Enterprise during static pad tests at Space Launch Complex-6 at Vandenberg Air Force, now Space Force, Base in 1985.
With its major pathfinder tasks completed, and its future uncertain, NASA returned Enterprise to Dryden on Sep. 6, 1981, for long-term storage. On July 4, 1982, NASA used it as a backdrop for President Ronald W. Reagan to welcome home the STS-4 crew. The following year, NASA sent Enterprise on a European tour, departing Dryden on May 13, 1983, with stops in the United Kingdom, Germany, Italy, and France for the annual Paris Air Show. Enterprise made a stop in Ottawa, Canada, on its return trip to Dryden, arriving there June 13. Workers once again placed it in temporary storage. For its next public appearance, NASA placed it on display in the U.S. pavilion of the World’s Fair in New Orleans between April and November 1984. After the World’s Fair, NASA ferried Enterprise to Vandenberg AFB in California to conduct fit checks at the Space Launch Complex-6 (SLC-6), that NASA had planned to use for polar orbiting shuttle missions. NASA used Enterprise to conduct tests at SLC-6 similar to the 1979 tests at KSC’s Launch Complex 39. The tests at Vandenberg completed, NASA ferried Enterprise back to Dryden on May 24, 1985, but this time for only a short-term storage. On Sep. 20, 1985, NASA ferried Enterprise to KSC and placed it on temporary public display near the VAB, next to the Saturn V already displayed there. After two months on display at KSC, NASA flew Enterprise to Dulles International Airport in Chantilly, Virginia, arriving on Nov. 18. NASA officially retired Enterprise and transferred ownership to the Smithsonian Institution that had plans to build a large aircraft museum annex at the airport. The Smithsonian placed Enterprise in storage in a hangar, awaiting the completion of its new home. That turned into an 18-year wait.
Left: Launch of STS-61A in October 1985, with Enterprise and the Saturn V in the foreground. Middle: Enterprise in long-term storage at Dulles International Airport in Chantilly, Virginia. Right: Enterprise during arresting barrier testing at Dulles.
But even during that 18-year wait, NASA found practical use for the venerable Enterprise. In 1987, the agency studied how to handle an orbiter returning from space should it suffer a brake failure. To test the efficacy of an arresting barrier, workers at Dulles slowly winched Enterprise into a landing barrier to see if the vehicle suffered any damage. Later that same year, NASA used Enterprise to test various crew bailout procedures being developed in the wake of the Challenger accident. In 1990, experimenters used Enterprise’s cockpit windows to test mount an antenna for the Shuttle Amateur Radio Experiment, with no other orbiters available. Periodically, engineers removed parts from Enterprise to test for materials durability, and evaluated the structural integrity of the vehicle including its payload bay doors and found it to be in sound condition even after years in storage. In April 2003, in the wake of the Columbia accident, investigators borrowed Enterprise’s left landing gear door and part of the port wing for foam impact tests. The tests provided solid evidence for the foam strike as the cause of the accident.
Left: Space shuttle Enterprise undergoes restoration at the Stephen F. Udvar-Hazy Center of the Smithsonian Institution’s National Air and Space Museum (NASM) in Chantilly, Virginia. Note the missing wing leading edge, donated for the Columbia accident investigation. Right: Enterprise on display at the Hazy Center. Image credits: courtesy NASM.
On Nov. 20, 2003, workers towed Enterprise from its storage facility into a newly completed display hangar at the Stephen F. Udvar-Hazy Center of the Smithsonian Institution’s National Air and Space Museum at Dulles. After specialists spent eight months restoring the orbiter, the museum placed it on public display on Dec. 15, 2004.
Left: Space shuttle orbiters Enterprise, left, and Discovery meet nose-to-nose at the Stephen F. Udvar-Hazy Center of the Smithsonian Institution’s National Air and Space Museum in Chantilly, Virginia. Right: Actor Leonard Nimoy greets Enterprise at New York’s John F. Kennedy International Airport.
In 2011, NASA retired the space shuttle fleet and donated the vehicles to various museums around the country. The Intrepid Sea, Air & Space Museum in New York City acquired Enterprise, and on Apr. 19, 2012, workers removed the orbiter from its display at the Hazy Center – replacing it with the orbiter Discovery – and placed it atop a SCA for the final time. Eight days later, after a short flight from Dulles, Enterprise landed at John F. Kennedy International Airport. Workers lifted the orbiter from the SCA and placed it on a barge. It eventually arrived at the Intrepid Museum on June 3 and went on public display July 19. Enterprise suffered minor damage during Superstorm Sandy in October 2012, but workers fully restored it.
Enterprise in the Shuttle Pavilion at the Intrepid Sea, Air & Space Museum in New York City. Image credit: courtesy Intrepid Museum.
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By European Space Agency
Video: 00:03:00 On 20 June 2024 the first Ariane 6 rocket to launch into space went through its last full ‘wet dress rehearsal’ at Europe’s Spaceport in French Guiana – it provided an exciting sneak peek of what’s to come, stopping just a few seconds before engine ignition and of course, liftoff.
One of the first steps was to roll back the colossal 90-m tall Ariane 6 mobile gantry building 120 m away from the launch pad – the first moment the complete rocket stood free.
The first parts of Ariane 6 began arriving in French Guiana from continental Europe in February 2024 via the Canopée ‘spaceship’. In March, the main stage and upper stage were assembled, followed by the transfer of the two powerful P120C boosters in April.
In May, Ariane 6’s first passengers also arrived in Kourou – a varied selection of experiments, satellites, payload deployers and reentry demonstrations that represent thousands across Europe, from students to industry and experienced space actors NASA and ArianeGroup.
The payloads were integrated onto the ‘ballast’ at the end of May, and just a few days ago the ballast was fitted onto the top of the rocket and the fairing closed around it – the last time Ariane 6’s cargo would see light.
From Earth observation to technology demonstrations testing wildlife tracking, 3D printing in open space, open-source software and hardware and science missions looking for the most energetic explosions in the universe, the passengers on Ariane 6’s first flight are a testament to the rocket’s adaptability, complexity, and its role for the future – launching any mission, anywhere.
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By NASA
In 1983, NASA received delivery of Discovery, the third space qualified vehicle in the agency’s space shuttle fleet. During the launch attempt for the STS-41D mission on June 26, 1984, Discovery’s onboard computers halted the countdown four seconds before liftoff, and after two of its main engines had already ignited. The six astronauts safely egressed the orbiter. This first on-the-pad abort of the shuttle program required the vehicle’s return to its assembly building for replacement of the faulty engine that caused the shutdown. The resulting two-month delay caused a shuffling of the mission’s payloads, but Discovery finally lifted off on Aug. 30, and the astronauts completed a successful six-day mission, deploying three commercial satellites, testing a new solar array, and conducting a commercial biotechnology experiment.
Left: Space shuttle Discovery rolls out of Rockwell’s Palmdale 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.
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). Discovery arrived at NASA’s Kennedy Space Center (KSC) on Nov. 9 after a cross-country ferry flight from Edwards, following a two-day stopover at Vandenberg Air Force, now Space Force, Base in California, atop the Shuttle Carrier Aircraft, a modified Boeing 747. Discovery, named after several historical ships of exploration, incorporated manufacturing lessons learned from the first orbiters as well as 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.
Left: The STS-41D crew patch. Right: The STS-41D crew of R. Michael “Mike” Mullane, front row left, Steven A. Hawley, Henry W. “Hank” Hartsfield, and Michael D. Coats; and Charles D. Walker, back row left, and Judith A. Resnik.
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. 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.
Left: Workers in the Vehicle Assembly Building (VAB) at NASA’s Kennedy Space Center in Florida lift Discovery to mate it with its external tank and solid rocket boosters. Middle: Initial rollout of Discovery from the VAB to Launch Pad 39A on May 19, 1984. Right: The Flight Readiness Firing on June 2.
The day after its arrival at KSC, workers towed Discovery from the SLF to the Orbiter Processing Facility (OPF) to being preparing it for its first space flight. Between Dec. 9, 1983, and Jan. 10, 1984, it entered temporary storage in the Vehicle Assembly Building (VAB) to allow postflight processing of Columbia in the OPF following STS-9. Workers returned Discovery to the OPF for final processing, towing it to the VAB on May 12 for mating with its External Tank (ET) and Solid Rocket Boosters (SRBs). The completed stack rolled out to Launch Pad 39A on May 19. On June 2, engineers successfully completed an 18-second Flight Readiness Firing of the shuttle 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.
Left: The June 26 launch abort. Right: Discovery’s three main engines hours after the launch abort.
The failure of the shuttle’s backup General Purpose Computer (GPC) caused a one-day delay of the first launch attempt on June 25. On June 26, the countdown proceeded smoothly and at T minus 6.6 seconds the orbiter’s GPCs began the serial ignition sequence of the three main engines. Normally, the three engines ignite at 0.12-second intervals to ease stress on the system and to allow onboard computers to diagnose any problems. Engines number 2 and 3, forming the base of the triangle closest to the body flap, ignited as planned, but engine number 1 at the apex of the triangle and nearest the vertical tail, did not ignite at all. This caused the Redundant Set Launch Sequencer (RSLS) to shut the two working engines down, calling an abort to the countdown at T minus 4 seconds. To ease the tension, Hawley reportedly said, “Gee, I thought we’d be a little higher at main engine cutoff.” The fact that engine number 1 had never ignited caused some momentary confusion as displays showed that the RSLS had not shut it down. A single engine still burning with the shuttle still on the pad would have led to a disaster. Once controllers and the onboard crew realized what had actually happened, they calmed down somewhat. What no one realized at the time is that a hydrogen fire, invisible to the naked eye, had broken out at the aft end of the orbiter. Had the crew evacuated at that time, they would have run through the invisible flames. The pad’s fire suppression system came on to deal with the fire, and when the crew did finally egress the shuttle, they received a good dousing of water. The crew returned safely, if a little drenched, to crew quarters. After ground teams assessed the cause of the abort, they made the decision to roll the stack back to the VAB, demate Discovery from the ET and SRBs and tow it back to the OPF. Workers replaced the faulty engine, and Discovery rolled back out to the launch pad on Aug. 9 for another launch attempt 20 days later, delayed by one day due to a software issue, and finally on Aug. 30, Discovery roared off its launch pad on a pillar of flame and within 8 minutes, NASA’s newest orbiter reached low Earth orbit.
Left: Gemini VI launch pad abort in December 1965. Right: Gemini VI crew of Thomas P. Stafford, left, and Walter M. Schirra.
Although the first on the pad abort of the space shuttle program, the June 1984 attempt to launch Discovery on STS-41D represented the second such incident in the American human spaceflight program. The dubious honor of the first on the pad abort belongs to Gemini VI. On Dec. 12, 1965, astronauts Walter M. Schirra and Thomas P. Stafford strapped into the spacecraft for their second launch attempt to rendezvous with Gemini VII. The countdown clock ticked down to zero, and the Titan-II rocket’s first stage engines ignited. And shut off after just 1.2 seconds. Although the mission clock aboard the spacecraft had started, the rocket had not lifted off, and Schirra made the split-second decision not to eject himself and Stafford from the spacecraft. Engineers later traced the cause of the abort to a dust cap inadvertently left in the engine compartment. After workers took care of that issue, Schirra and Stafford tried to launch again on Dec. 15, and the third time proved to be the charm.
Four space shuttle on-the-pad aborts. STS-51F in August 1985, left, STS-55 in March 1993, STS-51 in August 1993, and STS-68 in August 1994.
In the 10 years following the June 1984 abort, four additional shuttle launch attempts ended with an RSLS abort after at least one main engine had ignited.
July 12, 1985, STS-51F space shuttle Challenger
The RSLS executed a shutdown at T minus 3 seconds, after all three main engines had ignited, because the number two main engine’s chamber coolant valve did not close as rapidly as needed for startup. Investigations revealed a faulty sensor as the real culprit, and workers replaced it at the pad. Challenger launched successfully on July 29, but during ascent engine number 1 shut down, the only inflight failure of a main engine, resulting in the only abort to orbit of the program. Although the shuttle achieved a slightly lower than planned orbit, the mission met most of its science objectives.
March 22, 1993, STS-55 space shuttle Columbia
Following a trouble-free countdown, Columbia’s three main engines came to life at as planned, but three seconds later, the RSLS shut them all down when it detected that engine number 3 had not come up to full power. A tiny fragment of rubber caused a valve in the liquid oxygen system to leak, preventing the engine from fully starting. Columbia borrowed three main engines from Endeavour, and STS-55 took off on April 26 to carry out its German Spacelab-D2 mission.
Aug. 12, 1993, STS-51 space shuttle Discovery
After a trouble-free preflight processing and countdown, Discovery’s three main engines ignited as planned at T minus 6.6 seconds. Three seconds later, all three engines shut down. Investigation revealed the cause as a faulty sensor that monitors fuel flow through main engine number 2. Workers replaced all three engines at the pad, and Discovery took off on Sept. 12 to carry out its mission.
Aug. 18, 1994, STS-68 space shuttle Endeavour
Following a smooth countdown, Endeavour’s three main engines began their startup sequence at T minus 6.6 seconds. The GLS computers detected a problem with the No. 3 main engine’s High Pressure Oxidizer Turbine. One of its sensors detected a dangerously high discharge temperature, exceeding the rules of the Launch Commit Criteria, and Endeavour’s computers halted the countdown a mere 1.9 seconds before liftoff. Workers rolled Endeavour back to the VAB, replacing its three main engines with ones borrowed from Atlantis. STS-68 finally took off on Sept. 30 and successfully completed its radar mapping mission. NASA astronaut Daniel W. Bursch holds the distinction as the only person to have experienced two on-the-pad aborts, as he served as a mission specialist on both STS-51 and STS-68.
The lessons learned from these on-the-pad abort experiences can inform current and future programs. For example, the Space Launch System (SLS) uses main engines leftover from the space shuttle program to power its booster stage. And operationally, other launcher systems can learn from these experiences and safely manage similar future events.
Read recollections of the STS-41D mission by Hartsfield, Coats, Mullane, Hawley, and Walker in their oral histories with the JSC History Office.
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