NASA’s Artemis 1 lunar mission returns to the launch site.
Technicians from NASA’s Kennedy Space Center (KSC) in Florida began spinning Artemis 1 stack – a Space launch system (SLS) rocket, capsule-covered by Orion crew – exits the Vehicle Assembly Building (VAB) around 12:10 a.m. EDT (4:10 a.m. GMT) on Monday morning (June 6), re-taking the mega-lunar rocket 4 miles (6.4 kilometers) transition to the historic launch complex 39B.
The night journey took about 10 hours, with Artemis 1 arriving at the site just before 10:00 AM EDT (1400 GMT). Now, the vehicle stack and ground systems are waiting for a new attempt at refueling rocket and simulates the countdown to launch a critical series of tests known as the wet rehearsal, which is expected to begin on June 19.
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Artemis 1 will be the long-awaited debut trip for SLS, the development of which has been marked by numerous delays and cost overruns. (Orion has flown once before, traveling to Earth orbit in 2014)
The mission will fly with Orion without a crew The moon and back in preparation for the future Artemis missions aimed at bringing people back to the moon for the first time since 1972. So NASA is taking all precautions to ensure that the rocket’s debut is successful, including choosing to wash the first wet rehearsal in April to have time for further maintenance after three unsuccessful attempts to refuel the SLS with cryogenic fuel.
The first launch of Artemis 1 from VAB to Pad 39B took place on March 17, followed by a wet rehearsal that began on April 1. Unable to complete the full range of tests, NASA has decided to launch the vehicle and its mobile launch platform (MLP) back to VAB for repair on April 25. The technicians looked at the main reasons for the initial wet cleaning of the dress and also used the time at VAB to speed up other planned improvements.
During the first wet clothing experiment, ground crews encountered problems with refueling in the SLS intermediate cryogenic propulsion phase (ICPS), which is responsible for the orbital insertion of Orion and translucent injection burns. Loose flange bolts contributed to the leakage of hydrogen in the umbilical lines connecting MLP to ICPS. A NASA investigation revealed that the seals on these bolts have deteriorated to some extent as they have become obsolete and have applied torque checks to tighten the affected hardware.
Other repairs also focused on tackling the SLS’s cryocharging issues. The helium non-return valve was replaced by ICPS and modifications were made to the umbilical boots responsible for the rapid disengagement of the MLP shoulders from the SLS during take-off.
As the Artemis 1 stack has been absent from the Pad 39B for the past five weeks, upgrades at the launch complex have been able to move ahead ahead of schedule. In particular, NASA’s contractor, which supplies the infrastructure that processes and delivers nitrogen gas to the launch site, has nearly doubled the facility’s capacity by adding a second method of producing gas.
Huge amounts of nitrogen gas are used during the rehearsal of the wet dress, as well as the launch itself. On the one hand, the gas passes through all the fuel tanks and hoses of the rocket and ground infrastructure to help clean the ship’s cavities before and after refueling. The new upgrades will allow the systems to reach their full design capacity and will facilitate refueling tests for up to 32 hours, NASA officials said.
The upcoming wet rehearsal for Artemis 1 should start on June 19 and last about 48 hours. The countdown simulation will see the rocket during the actual pre-flight and refueling procedures just before the engine starts.
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NASA’s Artemis 1 lunar rocket exits the vehicle assembly building at the Kennedy Space Center in Florida on June 6, 2022, starting a 4.2-mile (6.8-kilometer) journey to launch complex 39B. (Image credit: NASA / Ben Smegelski)
KSC ground teams will coordinate with mission personnel at NASA’s Johnson Space Center mission in Houston, engineers at the Marshall Space Flight Center in Huntsville, Alabama, and the Eastern Space Station at Cape Canaveral in Florida. loading operations for over 700,000 gallons (2.65 million liters) of cryogenic fuel between the rocket’s infrastructure and the launch site.
A series of rehearsals for counting, detentions and interruptions, as well as various simulated weather scenarios will test the ability of ground crews to load and unload propellants through a number of different launch conditions. A few days after a successful wetsuit, the teams will return the SLS and Orion back to VAB to analyze test data, determine vehicle readiness and hopefully begin preparing the rocket for actual launch.
NASA officials have refrained from choosing a firm date for the Artemis 1 mission, citing the need to review the outcome of the wet dress rehearsal, but expressed optimism about a window in late August that could be possible if all goes well. the next few weeks. If the SLS hits any additional obstacles, NASA preventively publishes a list of future launch options which last until 2023
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