The MRJ team has been hard at work in 2018. Following a slate of important tests in 2017 and recent high altitude testing in Flagstaff, Arizona, the program has passed the midpoint in its flight test campaign—accumulating more than 1,700 total flight hours.
During the flight load survey tests, more than 250 pressure sensors and strain gauges affixed to the aircraft measured the maximum loads on its external surfaces and components. Throughout the test flights, the crew maneuvered the aircraft to reach specified G-loads, maximum rudder deflection, and roll and side slip thresholds as our engineers monitored the data and Japanese aviation authorities witnessed and approved the test via the telemetry room.
Flying the aircraft at varying altitudes and speeds beyond maximum operation limits, the high-speed flutter test demonstrated sufficient margin on the normal operating envelope of the MRJ. Testing for flutter – a phenomenon that occurs when aerodynamic forces cause rapid self-excited destructive vibration – required a heavily instrumented aircraft operated by well-trained crew that was monitored by engineering specialists on the ground.