Mirek6
Second Officer
Flight distance : 609724 ft
Canada
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Eliasson,
I will be brief since your log does not show anything too extreme.
I do not see any signs of overheating but I do see signs of possible issues with compass and/or IMU calibration.
When it is windy issues with calibration tend to get exacerbated and, often, to prevent catastrophic problems, Spark would drop to ATTI.
In your case it did not, but it started to lower its altitude (without any input from your sticks) and did forced landing.
This would be correct behaviour since the Spark was so close to the home point (few metres).
However, I do speculate here because your case is different than cases I have analyzed so far. In all cases which I analyzed, when compass and IMU get confused Spark would enter ATTI mode. But I have not yet seen the case where Spark was so close to the home point when safety procedures kicked in. As I said, I would consider such design correct and my bet is that this is what actually happened here.
I would suggest that you calibrate compass and IMU and try again. Watch the calibration videos very closely and follow all the instructions. It is extremely important to do it correctly – otherwise it may worsen the situation instead of helping. I will not repeat the procedures here – search for them on this forum. I will just say something which is usually omitted form calibration procedures – when calibrating compass turn your Spark very slowly. Do not rush.
After re-calibrating try to fly and see if the problems re-appear. If they don’t – problem solved. If the do reappear:
- Reset Spark to factory defaults – using DJI Assistant2
- Reinstall newest firmware
- Re-calibrate compass and IMU again
- Do some test flights
If this fixes the problem – good. If not, open the case with DJI Support because your Spark may be faulty.
Mirek
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