DroneFlying
 Second Officer
Flight distance : 10774613 ft
United States
Offline
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What the log shows is that the downward / VPS sensor believed that you were just above the ground starting at around 6:31 into the flight, and because you were pulling back on the throttle (left stick) it started landing.
My first thought from your description was that you had landing gear extensions attached which, as I've mentioned elsewhere, can cause an unsolicited landing, but your log file doesn't match the behavior I've seen in those other cases. I also wondered if maybe being over water had affected the sensors, but soon realized that you were much too high above the water for that to be the problem. I also found it odd that the log was terminated so soon after it started landing given that you probably had pretty good line of sight to the drone and that it was around 100 feet in the air at the time; a normal descent definitely would have taken more than 3 seconds to reach the water that far below.
Finally I realized from looking at the map that it seems you were flying directly above a power line strung between two large transmission towers, and given the Mavic's height I'm guessing you were just barely above it. I suspect that what happened is that your Mavic's downward sensor detected the power line directly below it, began landing because of the negative throttle input, and struck the power line on its way down.
I'm sorry about your loss but for future reference you'll want to disable the Landing Protection option before attempting a flight like this in the future. That'll keep the Mavic from auto-landing mode when it thinks the ground is close (and you're pulling back on the throttle).
P.S. Also for future reference, a landing can be canceled by applying positive / forward throttle (left stick) input, though in this case it looks like you'd have needed to react pretty quickly once the landing started to prevent this outcome.
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lvl.1
Administrator
lvl.2
