The tests were aimed at verifying the performance of the X-59's General Electric F414-GE-100 jet engine, a modified version of the engine used in Boeing's F/A-18 Super Hornet flown by the U.S. Navy.
NASA and Lockheed Martin recently released photos of the X-59 "quiet" supersonic jet conducting tests of its afterburner, blasting out a column of fire while in the hangar.