On November 26, 2005, the back-up solar array drive on Landsat 5 began exhibiting unusual behavior. The solar array drive maintains the proper pointing angle between the solar array and the Sun. The rotation of the solar array drive became sporadic, and the solar array was not able to provide the power needed to charge the batteries. Maintaining power to the batteries is critical to sustain proper operation of the spacecraft. The primary solar array drive failed under similar circumstances in January 2006. As a result of this situation, imaging operations were suspended. After a month-long investigation in December 2005 and testing in January 2006, new operating procedures were developed that would allow Landsat 5 to continue normal operations.