So our plane crashed while flight testing the APM 1.0. The aircraft simply stopped responding to pilot control as if the entire board shut off. We were not using any autopilot modes but was in manual. We recovered the autopilot as it was completely intact while being protected by a wooden enclosure.
We set up a test bed with the receiver connected to the APM 1.0 and servos from both the APM rail and the receiver. The receiver and the APM board are powered independently on a power supply, and we just had an operator sit there for an hour moving the radio joysticks around. Out hours of testing, there was one occurrence where the servos connected to the APM stopped moving, while the servos connected to the receiver directly continued to move. Therefore, the pilot radio and the receiver works. In this instance we checked the Mission Planner that was running and the Radio Input bars and HUD were both showing PWMs changes coming from the Xbee connection. So the APM is reading the PWM from the receiver, but not relaying them to the servos....
So why is the PWM not going to the servos from the APM board?! Do you guys recommend any specific type of diagnostic to find the source of this problem?
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