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A
pathfinder test article for NASA’s SLS core stage rests beside the B-2 test
stand at the Stennis Space Center in Mississippi that will be used for the ’Green-Run’
static fire test. Credit: NASA
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Ken
Kremer -- SpaceUpClose.com &
RocketSTEM – 27 July 2019
KENNEDY
SPACE CENTER, FL/MICHOUD ASSEMBLY FACILITY,LA – After months of
deliberating back and forth NASA
Administrator Jim Bridenstine announced July 25 that he has ‘greenlighted’ the “Green
Run” full duration engine test of the agency’s core stage for the mammoth Space Launch System
(SLS) moon rocket next year at NASA’s Stennis Space Center - ahead
of the upcoming Artemis 1
lunar mission launch.
Bridenstine had considered curtailing and even cancelling the 8
minute long full duration core stage engine test until recently in favor of a much
shorter duration static test fire lasting only a few seconds on the launch pad
at the Kennedy Space Center - but ultimately cited astronaut safety and rocket reliability
as the top reasons for his decision to give the ‘Go Ahead’ to the ‘Green Run’
The decision to conduct the ‘Green Run’ test was announced by
Bridenstine by tweet and by NASA in a statement on July 25.
“@NASA
will do a Green Run test for @NASA_SLS prior to #Artemis1. Here’s why:
-Astronaut
safety is our #1 priority
-Increases
probability of a successful Moon Landing in 2024
-Its
important to discover issues earlier rather than later”
The ”Green
Run” test involves conducting a full duration eight minute long static fire
test of the 212 foot long (64.6 m) SLS core stage at the B-2 Test Stand at NASA’s Stennis Space Flight Center near
Bay St. Louis, Mississippi.
The test would be run at
some point next year and pave the way to the first Artemis lunar mission set to
blastoff on the uncrewed Artemis-1 test flight perhaps by late 2020 or more
likely in 2021.
By
therein lies the crux of the matter. The “green run” test campaign could take
as long as six months and would make it very difficult to achieve the Artemis-1
launch by the end of 2020- before the end of Presidents Trump’s current term in
office.
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A
pathfinder test article for NASA’s SLS core stage arrives at the B-2 test stand
at the Stennis Space Center in Mississippi that will be used for the ’Green-Run’
static fire test. Credit: NASA
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Back in March, Vice President
Mike Pence challenged NASA to accelerate plans to return to the Moon and announced
the Trump Administrations new goal of achieving an American lunar landing by
2024 at the south pole with the first woman and next man from NASA’s astronaut
corps.
That 2024 landing target
is four years earlier then NASA’s prior goal of 2028 and would take place on the Artemis-3 mission. The recently renamed program derives from
Artemis being the twin sister of Apollo – NASA’s original Moon landing program
begun by President Kennedy.
While
there is significant support for returning to the lunar surface sooner, there has
been much pushback from both politicians and engineers on cutting the Green Run
test- specifically citing safety and reliability issues.
The “Green
Run” test has been a full, integral part of NASA’s SLS plans from the beginning
of the program back in 2011.
The SLS core stage
consists of two huge liquid propellant tanks that collectively hold 733,000
gallons of liquid oxygen and liquid hydrogen as well as associated state-of-the-art
avionics, miles of cables and propulsion systems that power the four RS-25
engines in the engine section at the base of the structure.
Collectively they will produce more than 2
million pounds of thrust firing for over 8 minutes to help send Artemis 1 and
NASA’s Orion deep space capsule beyond Earth’s orbit to the Moon beginning with
the maiden SLS launch from NASA’s Kennedy Space Center on historic Launch
Complex 39B.
“While the rocket is designed to evolve over
time for different mission objectives, the core stage design will remain
basically the same. The Green Run acceptance test gives NASA the confidence
needed to know the new core stage will perform again and again as it is
intended,” Lisa Bates, SLS deputy stages manager said in a statement.
“The SLS core stage is an engineering feat that
includes not only the largest rocket propellant tanks ever built but also sophisticated
avionics and main propulsion systems.”
The massive core stage for the first flight of NASA’s
mammoth Space Launch System (SLS) rocket and the Orion deep
space crew capsule for the Artemis 1
mission to the moon and back is finally taking shape at NASA’s sprawling Michoud
Assembly Facility (MAF) in New Orleans – recently visited by Space UpClose. Read our article/photos.
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The core stage for NASA first Space Launch System (SLS) rocket for the Artemis 1
mission is being manufactured at NASA’s Michoud Assembly Facility in New Orleans
as seen here on June 28, 2019. The RS-25 engines will be installed into the SLS
engine section Summer 2019. Credit: Ken
Kremer/kenkremer.com/spaceupclose.com
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Manufacture of SLS Core Stage-1
is about four/fifths complete right now.
The last of the four RS-25
engines that will power the core stage were delivered from NASA’s Stennis Space
Center near Bay St. Louis, Mississippi, to Michoud on June 27, 2019 - and I visited
them Up Close the next day on Friday, June 28 as part of our media tour. And they were a magnificent sight to behold!
The next step at Michoud will be to complete the assembly of the
core stage by finishing construction and outfitting of the bottom engine
section and integrating it onto the bottom of core stage 1.
The four RS-25 engines will then be installed by
technicians and engineers from NASA and Aerojet-Rocketdyne.
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Crews delivered the last of four RS-25 engines for Artemis 1, the first flight of
NASA’s Space Launch System (SLS) rocket and the Orion
spacecraft, from NASA’s Stennis Space Center near Bay St. Louis, Mississippi,
to NASA’s Michoud Assembly Facility in New Orleans on June 27, 2019. The Aerojet
Rocketdyne engines are lined up side-by-side on June 28 and will be installed
into the SLS engine section Summer 2019. Credit: Ken Kremer/kenkremer.com/spaceupclose.com
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The RS-25 engines are recycled from NASA’s space shuttles where
clusters of three then called Space Shuttle Main Engines or SSMEs powered the
orbiters and propelled 135 missions to space.
NASA now has 16 RS-25 engines in inventory. They have been modified
and upgraded to power SLS. They were originally
built and then refurbished by Aerojet Rocketdyne.
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UpClose
view of an RS-25 engine destined for Artemis 1,
the first flight of NASA’s Space Launch
System (SLS) rocket and the Orion spacecraft after delivery to NASA’s
Michoud Assembly Facility in New Orleans. The Aerojet Rocketdyne engine seen on
June 28 will be installed into the SLS engine section Summer 2019. Credit:
Ken Kremer/kenkremer.com/spaceupclose.com
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NASA hopes to complete
the assembly of Core Stage 1 by December in order to have any chance of achieving
a launch before the end of 2020 and the end of President Trump’s current term
in office.
But
SLS is years behind schedule and billions over budget because of repeated
difficulties encountered by prime contractor Boeing in manufacturing Core Stage-1. Thus the launch date for Artemis 1 has
slipped 3 years from 2017 and a reliable date is hard to predict.
The Trump Administration
agreed to provide NASA with a $1.6 Billion budget boost to the Fiscal Year 2020
budget request for NASA in order to achieve the 2024 south pole landing.
Bridenstine is working
hard with Congress to obtain the additional funds which are required to
kickstart development of a new human lunar lander – that’s the missing
component.
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NASA Administrator Jim Bridenstine announces NASA’s 2020 budget
request from the Trump Administration to NASA employees, contractors and the
media at the Kennedy Space Center in Florida on March 11, 2019– backdropped by
the Orion Artemis-2 crew capsule being assembled in the Neil Armstrong
Operation and Checkout Building. Credit: Ken Kremer/kenkremer.com/spaceupclose.com
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Artemis 1
will be the first mission launching Orion on the SLS rocket from Kennedy’s
Launch Pad 39B. The mission will take Orion thousands of miles past the Moon on
an approximately three-week test flight.
Orion will return to Earth and splashdown in the
Pacific Ocean off the coast of California, where it will be retrieved and
returned to Kennedy.
Assembly of the Orion crew capsule launching on
Artemis-1 was declared complete by VP Pence 1 week ago on July 20 – during a speech at KSC honoring the 50th anniversary of mankind’s first Moon Landing on Apollo 11.
Read my story/photos.
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Vice President Mike Pence visited NASA’s Kennedy Space Center in
Florida on July 20, 2019, to commemorate the 50th anniversary of the agency’s
Apollo 11 Moon landing. He joined Administrator Jim Bridenstine, Apollo 11 moonwalkwer Buzz Aldrin, KSC Director/astronaut
Bob Cabana and other dignitaries to announce the completion of NASA’s Orion
crew capsule for the first Artemis lunar mission – seen in the background in
the Neil Armstrong Operations and Checkout Building. Credit: Ken Kremer/kenkremer.com/spaceupclose.com
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When complete, the core
stage will measure 212 feet tall (64.6 meters) from tip to tip and 27.6 feet
(8.8 meters) in diameter.
It weighs approximately
188,000 lbs (85,275 kg) empty and is constructed from Aluminum 2219.
The core stage is
derived from the Space Shuttle External Tank (ET) – all of which were also
built at Michoud for 135 space shuttle launches. The core stage is about 20%
longer than the ET.
“Green
Run is a historic moment for NASA and Stennis for a number of reasons,” said
Dr. Richard Gilbrech, Director, Stennis Space Center, in a statement.
“For the
first time in NASA’s history, a launch vehicle will use flight hardware for its
first test, and the Stennis test stands will once again test the core stage for
Moon missions.”
“Historically, other NASA rockets built to carry
astronauts have used main propulsion test articles to test the integrated
engines and main propulsion system. The SLS program is performing the stage
testing with flight hardware. Once the validation of the stage is complete, the
entire stage will be checked out, refurbished as needed, and then shipped to
NASA’s Kennedy Space Center in Florida for the Artemis 1 launch. The next time
the core stage engines roar to life will be on the launchpad at Kennedy.”
The team at Stennis has spent years refurbishing
and renovating the historic B-2
Test Stand specifically to prepare for the “Green Run” test.
B-2 was used in prior NASA human launch programs
to test stages for the Saturn V and the space shuttle propulsion system in the
1970s – but not in a fully integrated fashion later used in an actual astronaut
launch.
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NASA Deputy Administrator James Morhard speaks
with media in front of flight hardware for Artemis 1 during his first visit to NASA’s
Michoud Assembly Facility in New Orleans Friday, June 28, 2019. Michoud is
manufacturing the core stage for NASA’s Space Launch
System (SLS) rocket. Credit: Ken
Kremer/kenkremer.com/spaceupclose.com
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The SLS core stage and test articles are shipped
to various NASA centers on NASA’s fortified and lengthened Pegasus barge.
After the ‘green run’ test campaign is successfully
completed, Core Stage-1 will travel by boat inside Pegasus from Stennis to KSC.
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NASA’s
Pegasus barge ready to haul an SLS LOX structural test article on June 28, 2019
from NASA Michoud to NASA Marshall for structural testing. Credit: Ken
Kremer/kenkremer.com/spaceupclose.com
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Orion Artemis 1 being manufactured by prime
contractor Lockheed Martin at KSC is moving forward and seems likely to be able
to support a 2020 launch atop SLS.
In fact earlier this month NASA conducted the critical
Ascent Abort-2 (AA-2) test on July 2 and confirmed that the launch abort system
tower can successfully pull Orion away in a split second in case of a
catastrophic rocket failure.
See our AA-2 articles and photos.
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NASA’s Ascent Abort-2 mission successfully launched at 7 a.m. EDT July
2, 2019 from Space Launch Complex 46 at Cape Canaveral Air Force Station in
Florida on a critical test of the Launch Abort System (LAS) with a test version
of the Orion crew module in this remote camera view. Credit: Ken Kremer/kenkremer.com/spaceupclose.com
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And the ground systems for SLS are also on track at NASA's Kennedy Space
Center in Florida.
The refurbished and enhanced SLS Mobile Launcher was rolled
out late June to the top of Launch Complex 39B from which it will launch. See
our photos.
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NASA’s
SLS Mobile Launcher rolls out at sunrise along the crawlerway to Launch Complex
39B at NASA’s Kennedy Space Center in Florida on Jun. 27, 2019 for the final trip
with no rocket atop time for key final testing and checkouts. Its next roll to the pad will
be with the 1st Space Launch System rocket and integrated Orion
spacecraft in preparation for the debut launch of Artemis 1 slated for NET late
2020. Credit:
Ken Kremer/kenkremer.com/spaceupclose.com
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Thus the Artemis 1 launch date hinges on completion and
certification of SLS Core Stage-1.
Watch for Ken’s continuing onsite coverage of NASA, SpaceX, ULA,
Boeing, Lockheed Martin, Northrop Grumman and more space and mission reports
direct from the Kennedy Space Center, Cape Canaveral Air Force Station, Florida
and Wallops Flight Facility, Virginia.
Stay
tuned here for Ken's continuing Earth and Planetary science and human spaceflight
news: www.kenkremer.com
–www.spaceupclose.com – twitter @ken_kremer – email: ken at kenkremer.com
Dr. Kremer is a research
scientist and journalist based in the KSC area, active in outreach and interviewed
regularly on TV and radio about space topics.
………….
Ken’s photos are for sale and he is available for lectures and outreach events
