NASA said the abbreviated second flight of its X-59 demonstrator on March 20 was caused by a “false positive” warning, after a post-flight investigation identified an instrumentation issue rather than an actual system fault.
The aircraft took off from Edwards Air Force Base in California at 10:54 a.m. local time but remained airborne for only about nine minutes of a planned one-hour mission. Test pilot Jim “Clue” Less initiated a return to base after a cockpit warning light indicated a potential problem.
Following analysis, engineers determined the alert had been triggered by incorrectly installed instrumentation, which generated a false indication of a system issue. The problem was resolved ahead of subsequent flights.
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Despite the shortened sortie, NASA said the team was able to gather useful data for the program, which is now entering a broader flight test phase in 2026.
The X-59 is central to NASA’s Quesst mission, aimed at demonstrating supersonic flight with a significantly reduced sonic boom signature. The aircraft is designed to produce a softer “thump” instead of the traditional loud shockwave associated with breaking the sound barrier.
The March 20 flight was intended to expand the aircraft’s flight envelope, including higher speeds and altitudes, as well as airflow testing around the engine inlet. That work resumed days later, with additional flights on March 26 and 27 reaching higher altitudes and speeds.
NASA plans a gradual expansion of the X-59’s operating envelope toward Mach 1.5 and 60,000 feet, ahead of future community noise testing campaigns across the United States.
