Logger
Second Officer
Flight distance : 2883714 ft
Australia
Offline
|
When you say "Your IMU and Compass readings ARE stable?" I can only say, YES they were. The Mavic is now drowned and with DJI so cannot check it anymore.
At the time we pulled the DAT and checked it to see if the landing site was geomagnetically distorted. It wasn't. If it were there would be a Yaw/magYaw separation in the logs. There were No Compass or IMU warnings. Immediately after the event I actually repeated the flight about 5 times hoping to get a real time screen recording of it but it did not reoccur again then.
Next time it started to drift off in a similar manner was a couple of weeks later, when I crashed.
It does clearly show my refurb Mavic was prone to drifting away un-commanded - way above any allowed specification.
The next time it happened (two weeks later) it took me by surprise, I mishandled it, leading to a crash. I know with 99.9% certaintly that had it not drifted, it would not have ended up crashing. It was hovering stationary 2 feet off the ground about 4 feet in front of me. I commanded down stick to land with the expectation it would descend vertically and land like it normally does. It started to do so, then rapidly started drifting away towards the river bank and drop off into river. Looking to me like it would smash sideways into the path right where the footpath dropped 5 feet into the river, or even fly on in to the river. My respsonse was to pitch forward, to clear the obstacle and put my self into the clear position over the river. Did this then realised my mistake as it was still descending . Had been testing the lack of autoland cancel a with the new firmware a couple of days prior so I was aware of it. So the moment I crossed above the river and saw the continuing descent, it dawned on me I was in this situation & I knew the flight was doomed. So I had to chose between ditching offshore = hard to retrieve, or bring it back close against the bank and allow it to crash which is what I did.
DJI in assessing my crash event simply quoted my stick inputs and implied that had I not done them the aircraft would not have crashed. Therefore Pilot Error. Disingenius. They did not at this point acknowledge that the aircraft was drifting (the trigger for my control inputs), nor extrapolate where it would have landed had I kept my hands off the controls, which in autoland would have been a perfectly reasonable thing to do.
Anyway hopefully I will pick up my second refurb tomorrow and be back in the air.
|
|