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Mavic Air slammed the ground full speed and flew into a tree
1408 16 2018-7-27
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johnfreeman
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Flight distance : 331348 ft
Latvia
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Hi!

Seems i've also reached my tipping point with Mavic issues, so I wanted to share my story.

It's already been a while that my Mavic Air has been somewhat unstable - yaw rotation without any input, floating on its own mid air without any wind at all, etc. All that despite mutiple factory resets and recalibrations. But nothing that couldn't be managed. Today tho, when I was landing after a short flight my Mavic just randomly slammed the ground full speed (I would call it free fall) from like ~6 meters and picked itself up again, and flew into a tree from where it almost fell into water. Thankfully it managed to recover at the last moment, so i still have in hand. Battery and the body of the drone is somewhat dinged up now, tho.

I've already uploaded flight record for the flight, so I'm awaiting some response, but given DJI track of solving issues i'm putting this down as a warning for the rest.
2018-7-27
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hallmark007
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Ireland
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Can you post your flight log here link below.

http://www.phantomhelp.com/LogViewer/Upload/
2018-7-27
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DJI Paladin
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Flight distance : 318 ft

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I'm sorry for the inconvenience. Have you contacted the Support Team to report the accident: http://www.dji.com/support? If the drone is in warranty period, I would recommend to do data analysis to check the exact status.
2018-7-27
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johnfreeman
lvl.2
Flight distance : 331348 ft
Latvia
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Already filled support ticket via app. Also log can be found @ http://www.phantomhelp.com/LogViewer/02LBWVTXVEF1VLDNGA2F/. If i'm playing it back via DJI app i see it location jumping all over the place during landing.
2018-7-27
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hallmark007
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johnfreeman Posted at 2018-7-27 09:57
Already filled support ticket via app. Also log can be found @ http://www.phantomhelp.com/LogViewer/02LBWVTXVEF1VLDNGA2F/. If i'm playing it back via DJI app i see it location jumping all over the place during landing.

Looking at your log it shows steady rate of descent from 6 mertres. You landed by applying 100% left stick down.
2018-7-27
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johnfreeman
lvl.2
Flight distance : 331348 ft
Latvia
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Sorry, should have clarified - "bump" happened @ 8:35. Altitude change you see between 8m 35.6s and 8m 35.7s is the jump back up after the fall. Height indicated in log could actually be correct - may have been 2.5~3m from which it fell. Had nudged it down a bit before, it stopped, then face planted and jumped back up again without any input. One thing for sure - it wasn't sport mode speed - it fell way faster.
2018-7-27
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johnfreeman
lvl.2
Flight distance : 331348 ft
Latvia
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Actually, looking at log now i see discrepancies in VPS and IMU altitude up untill 8m 36.7s, where VPS kept going to ground without any input while, IMU shows that height is at 9m. And then, @ 8:37:5 VPS is again at 1.4m. So, it seems like actual "bump" happened @ 8m 36.7s and then something yanked it up again.
2018-7-27
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HedgeTrimmer
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How long a time (seconds) after drone hit ground before drone smashed into tree?  After drone smashed into tree, did it tumble around before finally hit ground second time?
2018-7-27
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hallmark007
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johnfreeman Posted at 2018-7-27 11:26
Actually, looking at log now i see discrepancies in VPS and IMU altitude up untill 8m 36.7s, where VPS kept going to ground without any input while, IMU shows that height is at 9m. And then, @ 8:37:5 VPS is again at 1.4m. So, it seems like actual "bump" happened @ 8m 36.7s and then something yanked it up again.

Were you flying over trees ?
2018-7-27
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johnfreeman
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hallmark007 Posted at 2018-7-27 11:46
Were you flying over trees ?

Before that yes, but before the crash drone was hovering over dirt road, where I planned to land.
2018-7-27
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hallmark007
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johnfreeman Posted at 2018-7-27 12:03
Before that yes, but before the crash drone was hovering over dirt road, where I planned to land.

What I meant was were you flying over trees when your MavAir made a sudden jump, thought this may have been caused by VPs .
2018-7-27
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johnfreeman
lvl.2
Flight distance : 331348 ft
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HedgeTrimmer Posted at 2018-7-27 11:29
How long a time (seconds) after drone hit ground before drone smashed into tree?  After drone smashed into tree, did it tumble around before finally hit ground second time?

Regarding tree - after picking up again it started drifting towards the tree immediately, id say. After that, judging from the inputs, i panicked. Once I regained control, I managed to land as per usual.
2018-7-27
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johnfreeman
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hallmark007 Posted at 2018-7-27 12:08
What I meant was were you flying over trees when your MavAir made a sudden jump, thought this may have been caused by VPs .

Nope. I was over a flat dirt road when it happened.
2018-7-27
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rolling56
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Hope you get this resolved.
2018-7-27
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SparksBird
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Flight distance : 10693363 ft
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Sorry to hear.  Hope they can help you.
2018-7-27
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Aardvark
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johnfreeman Posted at 2018-7-27 12:13
Nope. I was over a flat dirt road when it happened.

Looks like it hit the ground at full throttle down in sports mode @ 8 minutes 36.7 seconds, throttle had been released at 8 minutes 34.9 seconds. In the last two seconds before impact it was travelling downward at about 8 ft/s (about 5.5 mph).


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2018-7-27
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johnfreeman
lvl.2
Flight distance : 331348 ft
Latvia
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VelocityZ actually shows pretty much what i saw and what VpsAltitude shows that by around 8:35.5~8 it had recovered from the last downward thrust. And then it accelerated again after switch from Sport to P mode.
2018-7-27
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