Problem with Engine Flight Controller to Delay First SLS/Orion launch

SLS and Orion full stacked in the Vehicle Assembly Building. (Credit: NASA)

KENNEDY SPACE CENTER, Fla. (NASA PR) — NASA’s Space Launch System (SLS) rocket and Orion spacecraft are undergoing integrated testing inside the Vehicle Assembly Building at NASA’s Kennedy Space Center in Florida to ensure they are “go” for launch of the Artemis I mission early next year.

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NASA’s Space Launch System Core Stage Heads to Kennedy Space Center

Artemis I core stage leaves Stennis Space Center on the Pegasus barge. (Credit: NASA)

BAY ST. LOUIS, Miss. (NASA PR) — The first core stage of NASA’s Space Launch System (SLS) rocket departs Stennis Space Center near Bay St. Louis, Mississippi, following completion of the Green Run series of tests of its design and systems. The stage now is in route to the agency’s Kennedy Space Center in Florida, its final stop prior to NASA’s launch of the Artemis I mission around the Moon. At Kennedy, the core stage will be integrated with the rest of the SLS rocket and the Orion spacecraft in preparation for launch. Through the Artemis program, NASA will return humans, including the first woman and first person of color, to the Moon and prepare for eventual journeys to Mars.

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NASA Conducts 2nd RS-25 Test in Latest Series for Artemis Moon Missions

RS-25 engine test. (Credit; NASA)

BAY ST. LOUIS, Miss. (NASA PR) — NASA conducted a second RS-25 single engine hot fire test April 6 as part of a new series to support the development and production of engines for the agency’s Space Launch System (SLS) rocket on future missions to the Moon.

The full-duration hot fire of more than eight minutes (500 seconds) was conducted on the A-1 Test Stand at NASA’s Stennis Space Center near Bay St. Louis. It is part of a scheduled seven-test series designed to provide valuable data for Aerojet Rocketdyne, lead contractor for the SLS engines, as it begins production of new RS-25 engines for use after the first four SLS flights.

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NASA Mega Moon Rocket Passes Key Test, Readies for Launch

The core stage for the first flight of NASA’s Space Launch System rocket is seen in the B-2 Test Stand during a second hot fire test, Thursday, March 18, 2021, at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. The four RS-25 engines fired for the full-duration of 8 minutes during the test and generated 1.6 million pounds of thrust. The hot fire test is the final stage of the Green Run test series, a comprehensive assessment of the Space Launch System’s core stage prior to launching the Artemis I mission to the Moon. (Credits: NASA/Robert Markowitz)

BAY ST. LOUIS, Miss. (NASA PR) — The largest rocket element NASA has ever built, the core stage of NASA’s Space Launch System (SLS) rocket, fired its four RS-25 engines for 8 minutes and 19 seconds Thursday at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. The successful test, known as a hot fire, is a critical milestone ahead of the agency’s Artemis I mission, which will send an uncrewed Orion spacecraft on a test flight around the Moon and back to Earth, paving the way for future Artemis missions with astronauts.

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NASA Completes Full Duration Hot Fire of Space Launch System Core

BAY ST. LOUIS, Miss. (NASA PR) — Teams from NASA’s Space Launch System (SLS) Program conducted a successful full-duration 8 minute (499.6 seconds) hot fire of the Artemis I core stage on Thursday, Mar. 18 at NASA’s Stennis Space Center near Bay St. Louis, Mississippi on the historic B-2 Test Stand.

The hot fire got underway at around 4:40 p.m. EDT with all four RS-25 engines ignited successfully and produced 1.6 million pounds of thrust, as they will to launch the Artemis I mission to the Moon. During the test the engines consumed more than 700,000 gallons of liquid oxygen and liquid hydrogen propellant. The test was conducted with the core stage that will launch that first Artemis mission. Engineers collect data on how the stage behaved during critical operations, such as throttling the engines up and down and moving the engines dynamically in a variety of patterns. In coming days, engineers will scrutinize the data and determine if the stage is ready to be delivered to NASA’s Kennedy Space Center in Florida where it will be integrated with the twin solid rocket boosters already stacked in the Vehicle Assembly Building.

To learn more, tune in to NASA TV for a post-test briefing at about 7 p.m. EDT.

Learn more about Green Run, and check back at this blog for updates on the SLS core stage hot fire test. Watch a replay of the test on NASA Television or NASA’s YouTube channel. For all the photos and videos related to the test, visit, the Green Run Album on NASA Images.org.

NASA TV to Air Second Rocket Test for Artemis Moon Missions

The core stage for the first flight of NASA’s Space Launch System rocket is seen in the B-2 Test Stand during a scheduled eight minute duration hot fire test, Saturday, Jan. 16, 2021, at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. The four RS-25 engines fired for a little more than one minute. The hot fire test is the final stage of the Green Run test series, a comprehensive assessment of the Space Launch System’s core stage prior to launching the Artemis I mission to the Moon. (Credit: NASA/Robert Markowitz)

BAY ST. LOUIS, Miss. (NASA PR) — NASA is targeting a two-hour test window that opens at 3 p.m. EDT Thursday, March 18, for the second hot fire test of the core stage for the agency’s Space Launch System (SLS) rocket at NASA’s Stennis Space Center near Bay St. Louis, Mississippi.

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Green Run Update: NASA Investigating Valve Performance Before Second Hot Fire

The core stage for the first flight of NASA’s Space Launch System rocket is seen in the B-2 Test Stand during a scheduled eight minute duration hot fire test, Saturday, Jan. 16, 2021, at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. The four RS-25 engines fired for a little more than one minute. The hot fire test is the final stage of the Green Run test series, a comprehensive assessment of the Space Launch System’s core stage prior to launching the Artemis I mission to the Moon. (Credit: NASA/Robert Markowitz)

BAY ST. LOUIS, Miss. (NASA PR) — NASA’s is reviewing the performance of a valve on the core stage of the Space Launch System rocket before proceeding with a second hot fire test at the agency’s Stennis Space Center near Bay St. Louis, Mississippi.

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Green Run Update: SLS Team Prepares Core Stage for Second Hot Fire Test

The core stage for the first flight of NASA’s Space Launch System rocket is seen in the B-2 Test Stand during a scheduled eight minute duration hot fire test, Saturday, Jan. 16, 2021, at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. The four RS-25 engines fired for a little more than one minute. The hot fire test is the final stage of the Green Run test series, a comprehensive assessment of the Space Launch System’s core stage prior to launching the Artemis I mission to the Moon. (Credit: NASA/Robert Markowitz)

BAY ST. LOUIS, Miss., February 12, 2021 (NASA PR) — The core stage Green Run test team has completed refurbishment activities and is preparing the Space Launch System (SLS) rocket’s core stage and its four RS-25 engines for a second hot fire test.

After the first SLS core stage hot fire test on Jan. 16 at NASA’s Stennis Space Center near Bay St. Louis, Mississippi, the team put the stand and core stage in a configuration so that the stage and stand could be refurbished. This involved installing platforms on the test stand so that technicians could inspect, access, and perform procedures on the hardware.

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NASA Sets Week of Feb. 21 for Repeat of Green Run Test

The core stage for the first flight of NASA’s Space Launch System rocket is seen in the B-2 Test Stand during a scheduled eight minute duration hot fire test, Saturday, Jan. 16, 2021, at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. The four RS-25 engines fired for a little more than one minute. The hot fire test is the final stage of the Green Run test series, a comprehensive assessment of the Space Launch System’s core stage prior to launching the Artemis I mission to the Moon. (Credit: NASA/Robert Markowitz)

BAY ST. LOUIS, Miss. (NASA PR) — Media are invited to attend NASA’s Space Launch System (SLS) rocket’s  second Green Run hot fire – a test of the rocket’s core stage and all of its integrated systems before its flight on the Artemis I lunar mission. NASA is targeting the week of Feb. 21 for the test in the B-2 Test Stand at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. The date for the test will be set following the test readiness review.

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RS-25 Engine Test Series to Demonstration Lower-cost Rocket Engine Components for NASA’s Artemis Program

RS-25 hot fire test (Credits: NASA/Stennis Space Center)

STENNIS SPACE CENTER, Miss., Jan. 27, 2021 (Aerojet Rocketdyne PR) — Aerojet Rocketdyne and NASA are gearing up for a new phase of RS-25 hot-fire testing that will validate new components for the engine, which powers the core stage of the agency’s Space Launch System super heavy-lift exploration rocket.

The Retrofit-2 test series, consisting of seven tests at NASA’s Stennis Space Center, is expected to begin Jan. 28 and run through June. Each hot-fire test will last up to 500 seconds on the A1 Test Stand.

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NASA Conducts 1st Hot Fire of New RS-25 Engine Test Series

RS-25 hot fire test (Credits: NASA/Stennis Space Center)

BAY ST. LOUIS, Miss. (NASA PR) — NASA conducts the first hot fire Jan. 28 in a new series of tests for production of RS-25 engines that will help power the agency’s Space Launch System (SLS) rocket on future deep space missions. The test of RS-25 developmental engine No. 0528 on the A-1 Test Stand at Stennis Space Center near Bay St. Louis, Miss., marks the beginning of a seven-test series designed to provide valuable data to Aerojet Rocketdyne, lead contractor for SLS engines, as the company begins production of new RS-25 engines.

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Green Run Update: NASA Proceeds With Plans for Second SLS Core Stage Hot Fire Test

The core stage for the first flight of NASA’s Space Launch System rocket is seen in the B-2 Test Stand during a scheduled eight minute duration hot fire test, Saturday, Jan. 16, 2021, at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. The four RS-25 engines fired for a little more than one minute. The hot fire test is the final stage of the Green Run test series, a comprehensive assessment of the Space Launch System’s core stage prior to launching the Artemis I mission to the Moon. (Credit: NASA/Robert Markowitz)

HUNTSVILLE, Ala. (NASA PR) — NASA plans to conduct a second Green Run hot fire test as early as the fourth week in February with the Space Launch System (SLS) rocket’s core stage that will launch the Artemis I mission to the Moon. The Green Run is a comprehensive assessment of the rocket’s core stage prior to launching Artemis missions.

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Rocket Roundup: NASA Doesn’t Get What It Wanted or Needed

The core stage for the first flight of NASA’s Space Launch System rocket is seen in the B-2 Test Stand during a scheduled eight minute duration hot fire test, Saturday, Jan. 16, 2021, at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. The four RS-25 engines fired for a little more than one minute. The hot fire test is the final stage of the Green Run test series, a comprehensive assessment of the Space Launch System’s core stage prior to launching the Artemis I mission to the Moon. (Credit: NASA/Robert Markowitz)

by Douglas Messier
Managing Editor

There’s an old saying that I made up just the other day. You can’t always get what you want, but if you test enough times, you get what you need.

Yes, I know. It’s unwieldy. And I expect a copyright infringement letter from the Rolling Stones’ shortly. Forgive me; it’s really hard to come up with a brand new saying that sounds old on short notice.

While we wait for the lawyers to weigh in, let’s talk about what happened over the weekend.

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