Raumfahrt - Startvorbereitung für Atlas-5 / Starliner test flight


ULA begins stacking unique Atlas 5 rocket for Starliner test flight

Ground crews hoisted the first stage of a United Launch Alliance Atlas 5 rocket vertical atop its mobile launch platform Monday at Cape Canaveral Air Force Station, Florida, in preparation for a scheduled Dec. 17 launch with Boeing’s Starliner spacecraft. Credit: United Launch Alliance

The stacking of a United Launch Alliance Atlas 5 rocket this week at Cape Canaveral signals the start of a busy six-week campaign to ready ULA’s trusty workhorse launcher for its debut in a new human-rated configuration in mid-December.

“There are certainly some unique and very exciting things about this particular vehicle,” said Caleb Weiss, ULA’s mission manager for the Starliner program.

The “firsts” for the Atlas 5’s next launch include the rocket’s first flight without a payload fairing, and the first use of a dual-engine Centaur upper stage on the Atlas 5. The Atlas 5 has flown 80 times to date, amassing a flawless success record carrying U.S. military, NASA and commercial payloads into orbit.

But launching astronauts comes with its own set of requirements, including new computers to monitor the rocket’s performance, and if required, trigger an abort to ensure the crew can escape the launcher in an emergency.

“Electrically, one of the unique things about this mission is that the launch vehicle and spacecraft are going to be talking to each other,” Weiss said in a recent interview. “We normally don’t have that. They will be sharing data throughout (the) flight.”

The Atlas 5 rocket’s first stage arrived at the Vertical Integration Facility early Monday for stacking atop its mobile launch platform. The crew access tower at pad 41 is seen in the background. Credit: United Launch Alliance

The Starliner spacecraft, developed by Boeing under a $4.2 billion commercial crew contract with NASA, will be the heaviest payload ever launched by an Atlas 5 rocket.

“I think it is absolutely more complex (than a typical ULA mission), and the reason is that, even though the mechanical interface may seem simple because it’s a bolted ring interface, to get to that bolted ring interface took a lot of design work and analysis to make sure that it could handle the flight loads,” Weiss told Spaceflight Now in an interview. “The aero skirt obviously has all the aerodynamic analysis behind it, and it also has doors in the bottom that will open in the event of an abort. That way, the abort engines have a place to vent so you don’t build up pressure in that cavity in an abort. So there’s certainly a lot of capability that’s built in just to the structure.”

ULA ground crews raised the Atlas 5’s first stage upright after sunrise Monday, and a crane carefully positioned the rocket on top of a mobile platform inside the Vertical Integration Facility at Cape Canaveral’s Complex 41 launch pad.

The milestone event, known as Launch Vehicle On Stand in ULA’s parlance, kicks off final assembly of the Atlas 5 rocket that will launch Boeing’s CST-100 Starliner crew capsule on its first space mission. The Starliner’s Orbital Flight Test, or OFT, is scheduled for liftoff Dec. 17 on an unpiloted demonstration of the ship before astronauts fly on the next Starliner spacecraft in 2020.

The Starliner spacecraft will fly in autopilot mode to the International Space Station for a week-long mission to assess the ship’s readiness for crewed flights. At the end of the mission, the capsule will undock and return to Earth for landing under parachutes — and cushioned by airbags — at one of several possible locations in the Western United States.

Boeing’s preferred landing site for the test flight is at White Sands Missile Range in New Mexico.

The Atlas 5’s 107-foot-long (32-meter) bronze first stage is powered by a Russian-made RD-180 engine that burns kerosene and liquid oxygen. On launch day, ULA will load 25,000 gallons of RP-1 kerosene fuel and 49,000 gallons of liquid oxygen into the first stage.

ULA plans to install two Aerojet Rocketdyne solid rocket boosters to the Atlas 5 core stage later this week, then lift the rocket’s Centaur upper stage atop the vehicle. Late last year, technicians mated the Centaur to the Atlas 5’s interstage adapter, which connects the Centaur with the first stage, and the launch vehicle adapter, the structural interface between the rocket and the Starliner crew capsule.

The Centaur, along with the adapters, will be raised at the end of the week on top of the Atlas 5 first stage in a single piece to complete the initial build-up of the launcher inside the VIF at pad 41.

Then comes a series of initial checkouts of the Atlas 5 rocket systems before Boeing’s Starliner spacecraft arrives at the launch pad in mid-November.

The Atlas 5 rocket’s first stage was raised vertical Monday to kick off the launch campaign for the Orbital Flight Test of Boeing’s Starliner crew capsule. Credit: United Launch Alliance

In mid-November, Boeing’s team will roll the Starliner spacecraft out of its factory, a former space shuttle hangar at NASA’s Kennedy Space Center, a few miles from the Atlas 5 launch pad.

With the addition of the Starliner capsule, the Atlas 5 rocket will stand 172 feet (52 meters) tall. That’s somewhat shorter than other Atlas 5 configurations, which fly with bulbous payload shrouds to shield satellites during the first few minutes of flight through the thick lower atmosphere.

The Starliner, with its thermal protection coating, does not require a payload fairing during launch.

This week, teams are loading several tons of hydrazine and nitrogen tetroxide propellant into the Starliner spacecraft inside a special fueling area inside the Boeing-run factory adjacent to Kennedy’s towering Vehicle Assembly Building.

Boeing technicians connected the two components of the Starliner spacecraft — the crew module and the service module — last month in preparation for the OFT mission.

After installing the Starliner on the Atlas 5, ULA and Boeing will roll the fully-assembled rocket to pad 41 for a full-up countdown rehearsal. The rocket will ride its mobile platform on rail tracks for the 1,800-foot (550-meter) trip to the pad.

The Integrated Day-of-Launch Test, or IDOLT, is a major exercise for ULA and Boeing ground teams.

The test “will give us the opportunity to deploy the crew access arm and verify all the access tower and arm interfaces with the spacecraft,” Weiss said. “We will fully tank the vehicle, and we will have people out there at the pad that will be simulating day launch operations, just like they will be for a real launch day.

“So they will be in the white room, they’ll open up the hatch of the Starliner,” he said. “They will practice going in and out, loading cargo, configuring Starliner for flight. So it’ll be a really good end-to-end system checkout of all the launch vehicle and spacecraft systems working together, as well as the people who are executing the operations.”

Artist’s concept of an Atlas 5 rocket with the Starliner spacecraft on top. Credit: Boeing

ULA constructed the crew access tower at pad 41 in preparation for Starliner launches. Near the top, a crew access arm provides astronauts with a walkway to board the crew capsule, with a “white room” to connect with the Starliner’s hatch.

Significant changes to the Atlas 5 rocket for crew missions include the Emergency Detection System, a computer that will track key parameters in flight, and command an abort if necessary.

The Atlas 5 carries two EDS processing units for redundancy. The rocket only needs one computer during launch.

The EDS processing units, based on the Atlas 5’s fight-proven INCA computer, will be “monitoring multiple measurements, thousands of times per second, up and down the rocket to look for anything that may appear off-nominal,” Weiss said. “And those boxes would be the ones to tell the spacecraft to abort if it ever detected something across the threshold.”

The EDS computers are located near the top of the Centaur upper stage. Data fed into the computers include “things like rates on the vehicle, accelerations, certain pressures, just various instrumentation across the vehicle that we chose as the critical measurements that could tell us if the vehicle is not performing nominally,” Weiss said.

Starliner’s unpiloted OFT mission will not have an active abort system. The capsule will be fitted with abort engines used during ground qualification testing, and engineers will evaluate the EDS computers’ performance to ensure proper settings for crewed missions.

On missions with astronauts, the Starliner crew could also manually issue an abort command using a handle inside the cockpit.

The dual-engine Centaur stage assigned to the CST-100 Starliner’s first Orbital Flight Test is pictured inside ULA’s factory in Decatur, Alabama. Credit: United Launch Alliance

The Atlas 5’s first launch with the Starliner spacecraft will also be the first to employ a Centaur upper stage with two Aerojet Rocketdyne RL10 engines. The dual-engine Centaur stage previously flew more than 100 times on earlier Atlas rocket variants, most recently in 2004.

“That extra engine does provide the additional thrust to lift that heavy payload to LEO (low Earth orbit,” Weiss said. “It also lets us also let this fly as shallower trajectory, which is more favorable if we had to ever have an abort with the crew on there. So that additional trust lets us design the trajectory in a way that is that optimizes the safety of the crew.”

The RL10 engines will consume super-cold liquid hydrogen and liquid oxygen, cumulatively generating nearly 45,000 pounds of thrust.

ULA and Boeing developed a design fix in 2016 to address aerodynamic problems discovered during wind tunnel testing. A 70-inch-long (1.8-meter) aeroskirt extension is installed on top of the Centaur upper stage, where it will be positioned against the bottom of the Starliner spacecraft during launch.,

“We did have quite a bit of analysis that was done early on in the program, wind tunnel testing, and what that showed us was that really get optimal stability on the vehicle, we wanted to extend the aerodynamic surface of the spacecraft further aft and that’s where we came up with the 70-inch aeroskirt, “Weiss said. “So once we incorporated that change, we went back and did additional wind tunnel testing, and all that came back with an improvement — you can improve the aerodynamics and improve the stability, overall stability of the vehicle.”

The aeroskirt will jettison from the rocket shortly after the Centaur ignites its RL10 engines around five minutes after liftoff, around the same time a payload fairing separates during a standard Atlas 5 launch.

Technicians prepare Boeing’s CST-100 Starliner spacecraft for fueling before its first unpiloted space mission. Credit: Boeing

The demands of a crew mission also forced ULA’s launch team to adjust the Atlas 5’s countdown.

The Atlas 5 countdown typically lasts nearly seven hours for a satellite launch. For Starliner missions, the countdown will run nearly 11 hours.

Assuming the OFT launch date remains set for Dec. 17, the Atlas 5 will roll out to pad 41 on Dec. 15 to allow ground teams to configure the rocket for the countdown and sync their schedules for the launch.

For a Dec. 17 launch, the Atlas 5’s liftoff time will be approximately 7:45 a.m. EST (1245 GMT). The launch time is determined by space station’s orbit, and moves around 20 to 25 minutes earlier each day.

Fueling of the Atlas 5’s first stage and Centaur upper stage with cryogenic propellants will commence around six hours prior to liftoff. A built-in countdown hold at T-minus 4 minutes, which normally lasts 15 minutes, will extend for four hours, a change to give the astronauts time to board the spacecraft.

“We will count down all the way to T-minus 4 minutes,” Weiss said. “The vehicle is, at the point, where it is ready to launch, we’re about to enter terminal count, and then we’ll hold four hours. That point is made to make sure that we are safe and stable, that we’ve done everything on the rocket to get it into flight condition. We’re not having to do any other switch flipping or changes in configurations.

“We really want to be in that that flight condition when the crew goes out there because that’s the safest,” Weiss said. “That gives us time to review all the data, and ensure that we’re going to let the crew go out there only after the vehicle is verified safe.”

SpaceX, NASA’s other commercial crew contractor, will strap astronauts into the Crew Dragon capsule before fueling of the ship’s Falcon 9 booster. SpaceX argues its plan, known as “load and go,” is safer because ground teams will not be at the launch pad with the rocket fueled for liftoff, and the Dragon crew could escape from the Falcon 9 using the capsule’s abort engines in case of an emergency.

Boeing’s plan for strapping the crew into the Starliner spaceship mirrors the way NASA boarded astronauts during the Apollo and space shuttle programs.

A “blue team” comprised of fewer than 10 Boeing and ULA employees will help the astronauts into the Starliner spacecraft during countdowns for crewed missions. The team’s job will be similar to the closeout crew from the Apollo and shuttle eras.

During the OFT countdown in December, the blue team will travel to the launch pad and run through their launch day procedures during the four-hour countdown hold, just as they would if astronauts were flying, according to Weiss.

The blue team will close the Starliner hatch and evacuate the pad before the resumption of the countdown. The crew access arm will retract from the Starliner spacecraft less than 10 minutes before liftoff, Weiss said.

Then the countdown clock will start ticking again at T-minus 4 minutes, and the Atlas 5 will switch to internal power, pressurize its propellant tanks, and prepare for ignition of its RD-180 main engine.

For Starliner flights to the space station, the Atlas 5 will vector its engine nozzles to head northeast from Cape Canaveral, paralleling the U.S. East Coast. The flight path will align the Starliner’s ground track with that of the space station.

The Atlas 5’s two strap-on solid rocket boosters will burn out around 90 seconds into the mission, then release to call into the Atlantic Ocean.

The RD-180 engine will throttle back late in its four-and-a-half minute burn to limit acceleration loads on the Starliner — and its crew — to no more than 3.5 Gs.

The first stage will switch off its RD-180 engine and jettison around four-and-a-half minutes after liftoff, allowing the Centaur upper stage to fire its RL10 engines to accelerate the Starliner spacecraft to near-orbital velocity.

According to ULA, the Atlas 5 will release the Starliner spacecraft on a 112-mile-high (181-kilometer) suborbital trajectory, just shy of the velocity needed to enter a stable orbit around Earth. After separating from the rocket, the Starliner’s own engines, mounted on the ship’s service module, will boost the spacecraft into orbit to begin the trek to the International Space Station.

The suborbital trajectory is unusual for a satellite launch, but it is similar to the technique used by the space shuttle. The shuttle’s three main engines, fed by cryogenic propellants from an external fuel tank, accelerated the orbiter into space, reaching a velocity just short of that required to enter orbit.

After jettisoning the expendable external tank, the shuttles fired their in-space maneuvering engines around a half-hour after launch to enter orbit. Otherwise, the shuttles would have cut short their missions and re-entered the atmosphere.

The Starliner will follow a similar launch profile on the OFT mission, and on the subsequent crewed flights.

“The Atlas 5 is flying a very unique trajectory for us,” said Josh Barrett, a Boeing spokesperson. “ULA usually flies the Atlas 5 on a steep trajectory to use the powerful booster engine and any added solids to gain as much altitude as quickly as possible before leveling off and then letting the incredibly efficient Centaur push the rest of the way to the desired orbit.

“With Starliner, the Atlas 5 is flying a much flatter and throttled back trajectory for two main reasons,” Barrett said in response to questions from Spaceflight Now. “The first is if we abort on a steep trajectory, we would have the potential to bounce off the atmosphere, so this trajectory allows a safe abort at every point through ascent. The second is it helps keep g-loading on crew members to a minimum on ascent.”

Boeing demonstrated the Starliner’s abort system in a critical test Monday in New Mexico. Engineers are investigating why one of the capsule’s three main parachutes did not deploy as intended, but Boeing says the chute issue is not expected to impact plans to launch the OFT mission in December.

“All the elements are clearly coming together,” said Chris Ferguson, a Boeing astronaut and former space shuttle commander who will fly on the Starliner’s Crew Flight Test next year. “In the meantime, we’re building up Spacecraft 2, which will be the one that will be the Crew Flight Test article.”

Ferguson will be joined on the Crew Flight Test by NASA astronauts Mike Fincke and Nicole Mann. The astronauts will spend up to six months on the space station.

Assuming a successful Crew Flight Test, NASA will certify the Starliner to begin regular crew rotation missions to the station later next year. SpaceX is performing a similar series of tests, having completed a pad abort test in 2015 and an unpiloted demonstration flight — similar to Boeing’s OFT — in March.

“We have got a lot of moving parts right now with various teams all over the country pulling together to make this all happen, and get humans back into space from the East Coast of Florida very soon,” Ferguson said Monday.

Quelle: SN


Update: 21.11.2019


Boeing’s first space-ready Starliner crew capsule heads to its launch pad Thursday


Boeing’s first Starliner crew capsule. Credit: Boeing

Boeing’s first Starliner crew capsule to fly in space is set to depart its factory Thursday at the Kennedy Space Center in Florida for a trip to a launch pad a few miles away, where it will be raised atop an Atlas 5 rocket for liftoff next month on an unpiloted test flight to the International Space Station.

The Starliner spacecraft is being readied for liftoff no earlier than Dec. 17 from Cape Canaveral on a week-long unpiloted demonstration flight to the International Space Station, a crucial precursor before the first crewed Starliner mission next year.

Fresh out of a fueling cell inside a former space shuttle hangar at Kennedy, the Starliner spacecraft is scheduled to roll out of its manufacturing facility around 5 a.m. EST (1000 GMT) Thursday on a slow-speed transporter for a road trip to pad 41 at nearby Cape Canaveral Air Force Station.

The Starliner spacecraft will be hoisted by crane into the Vertical Integration Facility at pad 41, where ground crews will connect the capsule to the top of a United Launch Alliance Atlas 5 rocket.

ULA began assembling components of the Atlas 5 rocket inside the VIF on Nov. 4, when the Atlas 5’s first stage was raised vertical on top of a mobile launch platform. Since then, technicians have installed two strap-on solid rocket boosters on each side of the Atlas 5’s bronze first stage and lifted the rocket’s Centaur upper stage on top.

The Centaur upper stage features two major changes from hardware that’s flown on ULA’s 80 previous Atlas 5 launches.

The Centaur designed for Starliner missions is powered by two Aerojet Rocketdyne RL10 engines, while the earlier Atlas 5 missions flew with a single-engine Centaur stage. ULA also designed a structural skirt on the top of the Centaur stage to reduce aerodynamic loads during the rocket’s climb through the atmosphere, a change introduced because the Starliner will not fly inside a payload shroud during launch.


Boeing’s first Starliner spacecraft ready for spaceflight is pictured on a transporter ahead of its departure from its factory at the Kennedy Space Center. Credit: Boeing

Since stacking the Atlas 5 rocket inside the VIF, ULA has powered up the launcher for a series of pre-flight checkouts. On Tuesday, ULA, Boeing and NASA teams conducted a mission dress rehearsal to practice countdown procedures ahead of the Starliner’s scheduled launch Dec. 17.

Once the Starliner spacecraft is lifted atop the Atlas 5, ground crews will verify a series of mechanical and electrical connections between the launch vehicle and the crew capsule. The entire Atlas 5 rocket with the Starliner on top will stand 172 feet (52 meters) tall.

NASA is paying Boeing more than $5 billion to develop, build and fly Starliner missions to ferry astronauts to and from the space station. SpaceX has received a similar set of agreements valued at approximately $3.1 billion for the company’s Crew Dragon spacecraft, which completed its first unpiloted test flight to the station earlier this year.

Both companies aim to fly NASA astronauts into low Earth orbit in the first half of 2020, ending nearly nine years of U.S. reliance on Russian Soyuz crew ferry ships since the retirement of the space shuttle.

Quelle: SN 


Update: 22.11.2019


Boeing CST-100 Starliner Takes Next Step for Orbital Flight Test


The Boeing CST-100 Starliner spacecraft is guided into position above a United Launch Alliance Atlas V rocket at the Vertical Integration Facility at Space Launch Complex 41 at Florida’s Cape Canaveral Air Force Station on Nov. 21, 2019.
Credits: NASA/Cory Huston
The Boeing CST-100 Starliner spacecraft rolls out from the company’s Commercial Crew and Cargo Processing Facility.
The Boeing CST-100 Starliner spacecraft rolls out from the company’s Commercial Crew and Cargo Processing Facility at NASA’s Kennedy Space Center in Florida.
Credits: Boeing
The Boeing CST-100 Starliner spacecraft arrives at the Vertical Integration Facility at Space Launch Complex 41.
A transporter carrying the Boeing CST-100 Starliner spacecraft arrives at the Vertical Integration Facility at Space Launch Complex 41 at Cape Canaveral Air Force Station in Florida.
Credits: NASA/Kim Shiflett

By Linda Herridge
NASA's Kennedy Space Center

The Boeing CST-100 Starliner spacecraft that will launch to the International Space Station on the company’s uncrewed Orbital Flight Test for NASA’s Commercial Crew Program (CCP) has taken a significant step toward launch. Starliner rolled out of Boeing’s Commercial Crew and Cargo Processing Facility at NASA’s Kennedy Space Center in Florida on Nov. 21, making the trek on a transport vehicle to Space Launch Complex 41 at Cape Canaveral Air Force Station.


“This is critical to our future as a nation,” said Kennedy’s center director Bob Cabana. “We’ve got to get astronauts flying on U.S rockets from U.S. soil, and this is just a huge step forward.”


Cabana was joined by CCP and Boeing leaders in a gathering of employees and families to watch Starliner roll out of the factory.


“For the team that has built the first American spacecraft designed to land on land, and to get it rolling out, is absolutely incredible,” said John Mulholland, Vice President and Program Manager of Boeing Commercial Crew Programs. “Something this complex takes a huge team.”


“Look at that amazing sight and what your success looks like,” said Kathy Lueders, NASA’s Commercial Crew Program Manager. “We’re not done yet. We’ve got to step into the mission carefully, fly this vehicle up to the space station, and bring it home safely.”


At the pad, Starliner was hoisted up at the Vertical Integration Facility and secured atop a United Launch Alliance Atlas V rocket for the flight test to the space station. The Atlas V rocket that will carry Starliner comprises a booster stage and dual-engine Centaur upper stage, as well as a pair of solid rocket boosters.


NASA astronauts Mike Fincke and Nicole Mann and Boeing astronaut Chris Ferguson were on hand to witness the rollout milestone ahead of the uncrewed flight test.


“This is the dawn of a new era,” said Ferguson. “For all of you youngsters out there who came out here early to watch, I’m glad you were a part of this. This is really important because this is your future, too.”


“We’re looking forward to the day when we’re launching people on a regular basis,” said Fincke. “As graduates of military test pilot schools, we are really excited to see how Starliner’s going to behave; we know it’s going to be awesome, and we’re going to get all kinds of really great test data from it.”



The uncrewed flight test, targeted to launch Dec. 17, will provide valuable data on the end-to-end performance of the Atlas V rocket, Starliner spacecraft and ground systems, as well as in-orbit, docking and landing operations. The data will be used as part of NASA’s process of certifying Boeing’s crew transportation system for carrying astronauts to and from the space station.


“It comes down to trust,” said Mann. “I’m talking about trust in the individuals—our fellow Americans—who are building this spacecraft and making this possible. You walk around the factory and there is this amazing attention to detail, and it gives you this great level of confidence,” said Mann.


NASA is working in partnership with Boeing and SpaceX to launch astronauts on American rockets and spacecraft from American soil for the first time since 2011. Safe, reliable and cost-effective human transportation to and from the space station will allow for additional research time and increase the opportunity for discovery aboard humanity’s testbed for exploration.

Quelle: NASA


Update: 6.12.2019




Rocket: Atlas V
Mission: Boeing’s CST-100 Starliner, Orbital Flight Test
Launch Date: Thursday, Dec. 19, 2019
Launch Time: Under Review
Launch Location: Space Launch Complex-41, Cape Canaveral Air Force Station, Florida

Mission Information: A United Launch Alliance (ULA) Atlas V rocket will deliver the CST-100 Starliner spacecraft to a 98 nautical mile (nmi) sub-orbital trajectory on its Orbital Flight Test (OFT) to the International Space Station. After Starliner separation from Atlas V, Starliner engines will burn taking it the rest of the way to orbit and on to the International Space Station.

Launch Notes: The Starliner Orbital Flight Test will be the 81st launch of the Atlas V and will mark ULA's 136th mission.

Launch Updates: To keep up to speed with updates, dial the ULA launch hotline at 1-877-852-4321 or join the conversation at, and; hashtags #AtlasV #Starliner

Go Atlas! Go Centaur! Go Starliner!

The AtlasV rocket with Starliner sits fully fueled at Space Launch Complex-41 for today’s countdown dress rehearsal ahead of the Orbital Flight Test mission.


Quelle: ULA


Update: 7.12.2019


Boeing's 1st Starliner Test Launch Now Set for Dec. 20 After SpaceX Dragon Delay


Boeing's first CST-100 Starliner spacecraft stands atop its United Launch Alliance Atlas V rocket during a "wet-dress" launch day rehearsal on Dec. 6, 2019.
(Image: © NASA)

Boeing's first uncrewed test flight of its Starliner spacecraft for astronauts is now set for no earlier than Dec. 20, one day later than planned, due to a SpaceXlaunch delay earlier this week. 

The United Launch Alliance (ULA) announced the 24-hour slip for Starliner today (Dec. 6) after successfully completing a critical "wet-dress" rehearsal for Boeing's upcoming test flight on an Atlas V rocket. During that rehearsal, Boeing, NASA and ULA fueled the Atlas V and practiced an entire launch countdown.

"We successfully conducted a wet dress rehearsal (WDR), a critical pre-launch milestone, on Friday, Dec. 6," ULA representatives said in a statement today. "We were unable to complete the milestone on Thursday, Dec. 5, as planned due to a weather-related launch delay of an International Space Station re-supply mission, which created a range resource conflict. This caused our targeted launch date to shift to the right by one day."

The resupply mission ULA refers to is SpaceX's CRS-19 Dragon cargo flight to the space station, which launched on Thursday (Dec. 5) after its own 24-hour delay due to high winds. A SpaceX Falcon 9 rocket launched the Dragon spacecraft from Space Launch Complex-40 at the Cape Canaveral Air Force Station, which is near ULA's Space Launch Complex-41, where the Atlas V carrying Starliner stands.

"We continue to work closely with Boeing to ensure that the Starliner flies as soon as the spacecraft and launch vehicle are ready," ULA representatives said. 

Today's wet dress rehearsal — dubbed an Integrated Day of Launch Test, or IDOLT, in spaceflight jargon — included each step of the launch procedure right up until liftoff. The "wet test" paves the way for the capsule's Orbital Flight Test mission later this month, when the vehicle will make its way to the space station without astronauts aboard.

That flight, in turn, will prepare Boeing and the rest of the Starliner team for the first crewed flight of the vehicle, which is expected to take place next year, also on a United Launch Alliance Atlas V.

During the rehearsal, flight personnel fueled the rocket booster, then tended to the Starliner capsule itself, mimicking the process that will unfold when astronauts take their first flight.

All told, the test took about six hours to complete, bringing the procedure right up to T-0 in the launch countdown, although the engines did not fire.

NASA astronaut Mike Fincke, who will be flying on the first crewed Starliner mission, was in Boeing's mission control at Kennedy Space Center for the test. He will fly with Boeing astronaut Chris Ferguson (a former space shuttle commander) and NASA colleague Nicole Mann.

Quelle: SC