The Large Scale Test Control Systems Designed and Built by the Boeing Company to Support the 757 and 767 Major Fatigue Tests

This paper describes the hardware and software that was designed, developed and built by Boeing to support the Major Fatigue Testing of full scale 757 and 767 airframes. These test control systems resulted in significant cost savings over previous programs. These systems are capable of applying pseudo random loading of complex flight load spectrums with up to 72 channels of control and 110 channels of Data Acquisition. The Major Fatigue Tests consisted of the application of two normal lifetimes of flights in a test environment that is performed on the ground with loads applied by closed loop servo hydraulic load control systems.