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By Space Force
The Department of the Air Force provided guidance March 19 for military members and civilian employees who are presently on TDY, traveling on PCS orders, or scheduled to begin such travel for A1-sponsored training.
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By NASA
6 Min Read NASA Stennis Flashback: Learning About Rocket Engine Smoke for Safe Space Travel
An image shows engineers at an early version of the test stand at the Diagnostic Testbed Facility. From 1988 to the mid-1990s, NASA Stennis engineers operated the facility to conduct rocket engine plume exhaust diagnostics and learn more about the space shuttle main engine combustion process. Credits: NASA/Stennis NASA’s Stennis Space Center near Bay St. Louis, Mississippi, is widely known as the nation’s largest rocket propulsion test site. More than 35 years ago, it also served as a hands-on classroom for NASA engineers seeking to improve the efficiency of space shuttle main engines.
From 1988 to the mid-1990’s, NASA Stennis engineers operated a Diagnostic Test Facility to conduct rocket engine plume exhaust diagnostics and learn more about the space shuttle main engine combustion process. The effort also laid the groundwork for the frontline research-and-development testing conducted at the center today.
“The Diagnostic Test Facility work is just another example of the can-do, will-do attitude of the NASA Stennis team and of its willingness to support the nation’s space exploration program in all ways needed and possible,” said Joe Schuyler, director of the NASA Stennis Engineering and Test Directorate.
The Diagnostic Test Facility work is just another example of the can-do, will-do attitude of the NASA Stennis team…
joe schuyler
NASA Stennis Engineering and Test Directorate Director
Tests conducted at the Diagnostic Testbed Facility played a critical safety role for engine operations and also provided a real-time opportunity for NASA Stennis engineers to learn about exhaust diagnostics. NASA/Stennis An image shows the Diagnostic Testbed Facility test stand data acquisition trailer. NASA/Stennis The Need
Envision a rocket or space vehicle launching into the sky. A trail of bright exhaust, known as the engine plume, follows. As metals wear down in the engines from the intense heat of the combustion process, the flame glows with colors, some visible, such as orange or yellow, and others undetectable by the human eye.
The colors tell a story – about the health and operation of the engine and its components. For space shuttle main engines, which flew on multiple missions, engineers needed to understand that story, much as a doctor needs to understand the condition of a human body during checkup, to ensure future engine operation.
Where better place to study such details than the nation’s premier propulsion test site? Paging NASA Stennis.
An image shows the rocket motor and thruster at the Diagnostic Testbed Facility. NASA/Stennis An image shows the Diagnostic Testbed Facility blended team of NASA personnel and contractors. Kneeling, left to right, is Brantly Adams (NASA), Felix Bircher (Sverdrup Technology), Dennis Butts (Sverdrup Technology), and Nikki Raines (Sverdrup Technology). Standing, left to right, NASA astronaut John Young, Greg Sakala (Sverdrup Technology), Barney Nokes (Sverdrup Technology), John Laboda (Sverdrup Technology), Glenn Varner (NASA), Stan Gill (NASA), Bud Nail (NASA), Don Sundeen (Sverdrup Technology), NASA astronaut John Blaha.NASA/Stennis The Facility
NASA Stennis has long enabled and supported innovative and collaborative work to benefit both the agency and the commercial space industry. When NASA came calling in the late 1980s, site engineers went to work on a plan to study space shuttle main engine rocket exhaust.
The concept for an enabling structure about the size of a home garage was born in October 1987. Five months later, construction began on a Diagnostic Testbed Facility to provide quality research capabilities for studying rocket engine exhaust and learning more about the metals burned off during hot fire.
The completed facility featured a 1,300-square-foot control and data analysis center, as well as a rooftop observation deck. Small-scale infrastructure was located nearby for testing a 1,000-pound-thrust rocket engine that simulated the larger space shuttle main engine. The 1K engine measured about 2 feet in length and six inches in diameter. Using a small-scale engine allowed for greater flexibility and involved less cost than testing the much-larger space shuttle engine.
An image shows Sverdrup Technology’s Robert Norfleet as he preps the dopant injection system for testing at the Diagnostic Testbed Facility. The goal of the facility was to inject known metals and materials in a chemical form and then look at what emissions were given off. During one test, generally a six or 12 second test, operators would inject three known dopants, or substances, and then run distilled water between each test to clean out the system.NASA/Stennis An image shows engineers Stan Gill, Robert Norfleet, and Elizabeth Valenti in the Diagnostic Testbed Facility test control center. NASA/Stennis The Process
Engineers could quickly conduct multiple short-duration hot fires using the smaller engine. A six-second test provided ample time to collect data from engine exhaust that reached as high as 3,900 degrees Fahrenheit.
Chemical solutions simulating engine materials were injected into the engine combustion chamber for each hot fire. The exhaust plume then was analyzed using a remote camera, spectrometer, and microcomputers to determine what colors certain metals and elements emit when burning.
Each material produced a unique profile. By matching the profiles to the exhaust of space shuttle main engine tests conducted at NASA Stennis, determinations could be made about which engine components were undergoing wear and what maintenance was needed.
We learned about purging, ignition, handling propellants, high-pressure gases, and all the components you had to have to make it work…It was a very good learning experience.
Glenn Varner
NASA Stennis Engineer
The Benefits
The Diagnostic Testbed Facility played a critical safety role for engine operations and also provided a real-time opportunity for NASA Stennis engineers to learn about exhaust diagnostics.
Multiple tests were conducted. The average turnaround time between hot fires was 18 to 20 minutes with the best turnaround from one test to another taking just 12 minutes. By January 1991, the facility had recorded a total of 588 firings for a cumulative 3,452 seconds.
As testing progressed, the facility team evolved into a collection of experts in plume diagnostics. Longtime NASA Stennis engineer Glenn Varner serves as the mechanical operations engineer at the Thad Cochran Test Stand, where he contributed to the successful testing of the first SLS (Space Launch System) core stage onsite.
However, much of Varner’s hands-on experience came at the Diagnostic Test Facility. “We learned about purging, ignition, handling propellants, high-pressure gases, and all the components you had to have to make it work,” he said. “It was a very good learning experience.”
An image shows the Diagnostic Testbed Facility team working in the test control center. Seated, left to right, is Steve Nunez, Glenn Varner, Joey Kirkpatrick. Standing, back row left to right, is Scott Dracon and Fritz Policelli. Vince Pachel is pictured standing wearing the headset. NASA/Stennis The physical remnants of the Diagnostic Testbed Facility are barely recognizable now, but that spirit and approach embodied by that effort and its teams continues in force at the center.
joe schuyler
NASA Stennis Engineering and Test Directorate Director
The Impact
The Diagnostic Testbed Facility impacted more than just those engineers involved in the testing. Following the initial research effort, the facility underwent modifications in January 1993. Two months later, facility operators completed a successful series of tests on a small-scale liquid hydrogen turbopump for a California-based aerospace company.
The project marked an early collaboration between the center and a commercial company and helped pave the way for the continued success of the NASA Stennis E Test Complex. Building on Diagnostic Testbed Facility knowledge and equipment, the NASA Stennis complex now supports multiple commercial aerospace projects with its versatile infrastructure and team of propulsion test experts.
“The physical remnants of the Diagnostic Testbed Facility are barely recognizable now,” Schuyler said. “But that spirit and approach embodied by that effort and its teams continues in force at the center.”
Additional Information
NASA Stennis has leveraged hardware and expertise from the Diagnostic Testbed Facility to provide benefit to NASA and industry for two decades and counting.
The facility’s thruster, run tanks, valves, regulators and instrumentation were used in developing the versatile four-stand E Test Complex at NASA Stennis that includes 12 active test cell positions capable of various component, engine, and stage test activities.
“The Diagnostic Testbed Facility was the precursor to that,” said NASA engineer Glenn Varner. “Everything but the structure still in the grass moved to the E-1 Test Stand, Cell 3. Plume diagnostics was part of the first testing there.”
When plume diagnostic testing concluded at E-1, equipment moved to the E-3 Test Stand, where the same rocket engine used for the Diagnostic Testbed Facility has since performed many test projects.
The Diagnostic Testbed Facility thruster also has been used for various projects at E-3, most recently in a project for the exploration upper stage being built for use on future Artemis missions.
In addition to hardware, engineers who worked at the Diagnostic Testbed Facility also moved on to support E Test Complex projects. There, they helped new NASA engineers learn how to handle gaseous hydrogen and liquid hydrogen propellants. Engineers learned about purging, ignition, and handling propellants and all the components needed for a successful test.
“From an engineering perspective, the more knowledge you have of the processes and procedures to make propulsion work, the better off you are,” Varner said. “It applied then and still applies today. The Diagnostic Testbed Facility contributed to the future development of NASA Stennis infrastructure and expertise.”
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Last Updated Feb 25, 2025 EditorNASA Stennis CommunicationsContactC. Lacy Thompsoncalvin.l.thompson@nasa.gov / (228) 688-3333LocationStennis Space Center Related Terms
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By Space Force
The DAF released guidance on reestablishing travel for Non-Covered Assisted Reproductive Technology.
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By Space Force
The memorandum provides guidance on travel for Non-Covered Reproductive Health Care Service.
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By NASA
4 Min Read NASA Space Tech’s Favorite Place to Travel in 2025: The Moon!
The first image from space of Firefly's Blue Ghost mission 1 lunar lander as it begins its 45-day transit period to the Moon. Credits: Firefly Aerospace NASA Space Technology has big travel plans for 2025, starting with a trip to the near side of the Moon!
Among ten groundbreaking NASA science and technology demonstrations, two technologies are on a ride to survey lunar regolith – also known as “Moon dust” – to better understand surface interactions with incoming lander spacecraft and payloads conducting experiments on the surface. These dust demonstrations and the data they’re designed to collect will help support future lunar missions.
Blue Ghost Mission 1 launched at 1:11 a.m. EST aboard a SpaceX Falcon 9 rocket from Launch Complex 39A at the agency’s Kennedy Space Center in Florida. The company is targeting a lunar landing on Sunday, March 2.
The first image from space of Firefly’s Blue Ghost mission 1 lunar lander as it begins its 45-day transit period to the Moon. Firefly Aerospace NASA Space Technology on Blue Ghost Mission 1
NASA’s Electrodynamic Dust Shield (EDS) will lift, transport, and remove particles using electric fields to repel and prevent hazardous lunar dust accumulation on surfaces. The agency’s Stereo Camera for Lunar Plume-Surface Studies (SCALPSS) technology will use stereo imaging to capture the impact of rocket plumes on lunar regolith as the lander descends to the Moon’s surface, returning high-resolution images that will help in creating models to predict regolith erosion – an important task as bigger, heavier payloads are delivered to the Moon in close proximity to each other.
The EDS and SCALPSS technologies will be delivered to the Moon on Firefly’s first Blue Ghost mission, named Ghost Riders in the Sky, as part of NASA’s CLPS (Commercial Lunar Payload Services) initiative. Its landing target is a 300-mile-wide basin located on the Moon’s near side, called Mare Crisium – a large, dark, basaltic plain that filled an ancient asteroid impact. First-of-their-kind experiments will deploy after landing to gather important data in a broad spectrum of areas including geophysical characteristics, global navigation, radiation tolerant computing, and the behavior of lunar regolith.
Replicating the Moon’s harsh environment on Earth is a significant challenge because of extreme temperatures, low gravity, radiation, and dusty surface. The CLPS initiative provides unprecedented access to the lunar surface, allowing us to demonstrate technologies in the exact conditions they were designed for. Missions like Blue Ghost Mission 1 are a true game changer for NASA technology advancement and demonstration.”
Michael Johansen
Flight Demonstrations Lead for NASA’s Game Changing Development program
Dust particles scatter during an experiment for the Electrodynamic Dust Shield in a laboratory at NASA’s Kennedy Space Center in Florida. NASA NASA’s Stereo Camera for Lunar Plume-Surface Studies technology integrated on Firefly’s Blue Ghost lander. Firefly Aerospace A complex wrinkle ridge in Mare Crisium at low Sun, seen in an image captured by the Lunar Reconnaissance Orbiter Camera.NASA/GSFC/Arizona State University Understanding regolith
The Moon’s dusty environment was one of the greatest challenges astronauts faced during Apollo Moon missions, posing hazards to lunar surface systems, space suits, habitats, and instrumentation. What was learned from those early missions – and from thousands of experiments conducted on Earth and in space since – is that successful surface missions require the ability to eliminate dust from all kinds of systems. Lunar landings, for example, cause lunar dust to disperse in all directions and collect on everything that lands there with it. This is one of the reasons such technologies are important to understand. The SCALPSS technology will study the dispersion of lunar dust, while EDS will demonstrate a solution to mitigate it.
Getting this new data on lunar regolith with be pivotal for our understanding of the lunar surface. We’ve long known that lunar dust is a huge challenge. The Lunar Surface Innovation Initiative has enabled us to initiate lunar dust mitigation efforts across the agency, working with industry and international partners. The lunar science, exploration, and technology communities are eager to have new quantitative data, and to prove laboratory experiments and develop technology solutions.”
Kristen John
Technical Integration Lead for NASA’s Lunar Surface Innovation Initiative (LSII)
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[VIDEO] Dust on the lunar surface is a significant hazard for systems and astronauts living and working on the Moon. NASA space technologies are developing solutions to retire hurdles in this capability area. NASA Space Technology Dust mitigation technology has come a long way, but we still have a lot to learn to develop surface systems and infrastructure for more complex missions. LSII is actively engaged in this effort, working with the lunar community across sectors to expand knowledge and design new approaches for future technologies. Working alongside the Lunar Surface Innovation Consortium, LSII has a unique opportunity to take a holistic look at dust’s role in the development of surface infrastructure with other key capability areas including in-situ resource utilization, surface power, and surviving the lunar night.
Learning from the the Moon benefits Mars science and exploration
Capabilities for minimizing dust interaction are as important for future missions on Mars as it is for missions on the Moon. Like the Moon, Mars is also covered with regolith, also called Martian dust or Martian soil, but the properties are different than lunar regolith, both in shape and mineralogy. The challenges Mars rovers have encountered with Martian regolith have provided great insight into the challenges we will face during lunar surface missions. Learning is interwoven and beneficial to future missions whether hundreds of thousands of miles from Earth, on the Moon, or millions, on Mars.
Scientist-astronaut Harrison Schmitt, Apollo 17 lunar module pilot, uses an adjustable sampling scoop to retrieve lunar samples during the second Apollo 17 extravehicular activity (EVA). NASA NASA’s Perseverance Mars rover snagged two samples of regolith – broken rock and dust – on Dec. 2 and 6, 2022. This set of images, taken by the rover’s left navigation camera, shows Perseverance’s robotic arm over the two holes left after the samples were collected.NASA/JPL-Caltech Learn more from a planetary scientist about how science factors into lunar dust mitigation technologies:
LSIC Lunar Engineering 101 video series (Dust/Regolith module) Share
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Last Updated Jan 24, 2025 LocationNASA Headquarters Related Terms
Missions Artemis Commercial Lunar Payload Services (CLPS) Earth's Moon Game Changing Development Program Kennedy Space Center Langley Research Center Lunar Surface Innovation Consortium Lunar Surface Innovation Initiative NASA Headquarters Space Technology Mission Directorate Explore More
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Space Technology Mission Directorate
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Game Changing Development Projects
Game Changing Development projects aim to advance space technologies, focusing on advancing capabilities for going to and living in space.
Commercial Lunar Payload Services (CLPS)
The goal of the CLPS project is to enable rapid, frequent, and affordable access to the lunar surface by helping…
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