DJI Susan Posted at 2017-10-17 02:17
Thanks for getting back to us. And I have replied you in this post: https://forum.dji.com/forum.php? ... =1&extra=#pid999251
The drone will not hover or brake in ATTI mode. And when the accident happened, the aircraft was under your control as there were sticks input. I'm sorry it is not a warranty case according to the data we collected. I know it is a hard lesson, let's learn from it and move on.
Dear DJI Susan, Thank you for your response but it does not contain the requested clarification. I understand that DJI could not provide warranty service in this case and I accepted this.
I am worried about the arguments on which the decision of DJI support is based. “data analysis result: 1.The aircraft was controlled by pilot in ATTI mode due to no GPS signal. 2.T=02:15, H=1m, aircraft drifted and crashed and flight record interrupt..Before the crash pilot was pushing throttle stick upward. Then flight record interrupted.” Even the screenshot attached for reference (T=02:09) is not selected properly.
If you take a closer look at the screenshots below, you can see that the speed of aircraft decreases after stick inputs. (The commands were an attempt to oppose the erratic movements of my Spark). After that there in an increase of horizontal speed with no input (T=02:13 – 02:16). You can also notice the insignificant response of the craft to throttle up input. This behavior is explained by DJI support as follows: “The aircraft "leaned" in a specific direction and started to speed up because of this. The movement would have to be conteracted by the pilot. depending on the "leaning angle" of the unit, a throttle up command will result in a even higher acceleration.”
Note that I am aware of drone behavior in ATTI mode as you can see in my thread and Spark is not my first dronе. This explanation disturbs me because it describes exactly what happened but this is not normal behavior, i.e. the aircraft should not remain leaned after the stick is returned in neutral position. My request is to clarify the explanation given by DJI support.
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