The third flight-test Falcon 6X, registered as F-WAVE, took to the skies late last week, edging Dassault Aviation’s 5,500-nm, large-cabin twinjet one step closer to its planned certification next year. S/N 3, which has a full interior and will be used for cabin design validation, made its inaugural flight on June 24, attaining an altitude of FL400 and speeds up to Mach 0.85, the French aircraft manufacturer announced on Thursday.

This follows the first 6X that flew on March 10 and the second on April 30. To date, these two aircraft have accumulated more than 130 flight-test hours at a rate of two to three flights a week, with envelope expansion now nearly complete, according to Dassault.

“This latest flight is yet another sign of the smooth progress we have been making with the 6X test program,” said Dassault Aviation chairman and CEO Eric Trappier. “We have been consistently impressed with the flight performance and handling of the 6X and the reliability of aircraft systems.”

S/N 3 will be used to test in-flight entertainment and communications systems, as well as evaluate environmental features and temperature control and validate cabin acoustics systems, the company said. A fourth flight-test 6X, which will also have a full interior, is currently being outfitted at Dassault’s site in Mérignac, France. This aircraft will conduct a two-month global endurance flight campaign to ensure that all 6X systems are fully mature upon entry into service. Meanwhile, S/N 10 is now on the final assembly line in Mérignac.