Flight test
（重定向自Aircraft testing）
![Thermal imaging of the controlled-descent flight test of the Falcon 9 first stage from stage separation onward, on Falcon 9 Flight 13, 21 September 2014. Includes footage as the first stage maneuvers out of the second stage plume; coasting near peak altitude of approximately 140 km (87 mi); boost-back burn to limit downrange translation; preparing for the reentry burn; and the reentry burn from approximately 70 km (43 mi) to 40 km (25 mi) altitude. Does not include the landing burn near the ocean surface as clouds obscured the infrared imaging at low altitude.](/Images/godic/202412/20/-Falcon_9_Flight_13_infrared_video_of_first_stage_propulsive_descent.ogv1125.jpg")
![Static pressure probe on the nose of a Sukhoi Superjet 100 prototype](/Images/godic/202412/20/Sukhoi_Superjet_100_prototype1125.jpg")
![Flight test pressure probes and water tanks in 747-8I prototype](/Images/godic/202412/20/Cabin_nose_section_of_747-8I_prototype1125.jpg")
![Static pressure probe rig aboard Boeing 747-8I prototype; A long tube, rolled up inside the barrel, is connected to a probe which can be deployed far behind the tail of the aircraft](/Images/godic/202412/20/Boeing_747-8I_prototype_static_pressure_probe1125.jpg")
Flight testing is a branch of aeronautical engineering that develops and gathers data during flight of an aircraft, or atmospheric testing of launch vehicles and reusable spacecraft, and then analyzes the data to evaluate the aerodynamic flight characteristics of the vehicle in order to validate the design, including safety aspects.