An F-35A Lightning II conventional takeoff and landing aircraft, known as AF-1, completed its final test mission for clean wing flutter recently.

Flutter testing was conducted to ensure the jet's structure could withstand various aerodynamic loads verifying the F-35A's design.

The mission, flown by Maj. Ryan "Gunner" Reinhardt, marks the conclusion of three years of testing that now allows the F-35A to proceed with tests continuing to expand its flight envelope and validate predictions in real-world scenarios.

The testing demonstrated the F-35 is clear of flutter, at speeds up to 1.6 Mach and 700 knots with weapon bay doors open or closed, critical to performing its combat mission.  Data collected proves the F-35A flight dynamics maintains a large margin between its designed airspeed and airspeeds where possible flutter could occur.