NASA’s X-59 Flight-test Program Now Gaining Momentum

NASA’s flight-test program for its X-59 supersonic demonstrator has begun to pick up steam, now prepping for a fifth flight this week that will reach altitudes up to 32,000 feet and speeds of up to 275 keas. The momentum follows a March 20 second flight of the Mach 1.4 aircraft that lasted just nine minutes, cut short after a vehicle system warning light illuminated.

Agency officials said they determined the warning indicator light ultimately was a false positive, adding, “A post-flight investigation found the indicator’s instrumentation was incorrectly installed, creating a false positive of a problem. The team resolved the issue prior to the X-59’s third flight.”

Once determined, NASA returned the demonstrator to the flight-test program, accomplishing a nearly hour-long third flight on March 26, followed by a fourth flight the next day from the agency’s Armstrong Flight Research Center at Edwards Air Force Base in California. NASA test pilot Jim “Clue” Less flew both those flights, along with the second flight.

That second flight kicked off what will be dozens of tests that are planned for 2026 with the aircraft built through a partnership with Lockheed Martin at the company’s famed Skunk Works facility in Palmdale, California.

“The team is currently working through the first block of test points,” the agency explained. “The first priority of this block of test points is to fly higher and faster. Flights will go up to 43,000 feet and Mach 0.95. Block 1 flights will also include some of the low and slow test points, like this next flight.”

As the agency expands the envelope, the fifth flight will be the first in which the pilots retract the landing gear, examining the performance during the transition to gear up.

As for the short second flight, Cathy Bahm, project manager for NASA’s Low-Boom Flight Demonstrator at the Armstrong Flight Research Center, had stated afterward, “Despite the early landing, this is a good day for the team. We collected more data, and the pilot landed safely.”

Less, meanwhile, maintained that the airplane performed just like it had in the simulator. “And that’s what we like to hear. This is just the beginning of a long flight campaign.”

Once it reaches supersonic speeds, the aircraft will be used as part of NASA’s Quesst mission to study the impact of a “quiet thump” versus a sonic boom on various communities. This data will be gathered to assess the possibility of supersonic flight over land with the use of new aircraft technologies.