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Mavic Air fell out from sky!!!
1230 20 2018-11-4
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M4VERICK8
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Flight distance : 500528 ft
Brazil
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Hi guys,

A friend of mine had a bad experience this morning. I'm here to try to find out what was wrong on his flight. UAV Forecast was all clear. This is his first drone and had a couple of flights.

Log: http://www.phantomhelp.com/LogViewer/25JVZZRHXHCLXOB8JE0Z/

Video:


2018-11-4
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Anthony566
lvl.4
Flight distance : 2488944 ft
United Kingdom
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Hmm not sure
This all seems to happen after a short cell deviation ...

I take it he has submitted a support case with DJI ???
2018-11-4
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A CW
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Bird attack may be?
2018-11-4
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M4VERICK8
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Anthony566 Posted at 11-4 13:12
Hmm not sure
This all seems to happen after a short cell deviation ...

Yes he did in this evening.



2018-11-4
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M4VERICK8
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A CW Posted at 11-4 13:15
Bird attack may be?

I thought that too. But he said there were no birds around the drone.
2018-11-4
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hallmark007
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There’s isn’t a whole lot in your flight log.
But one thing would concern me, at the beginning of your flight there was a noticeable deviation in the battery of 0.15 which is a concern and if it was me I would not take flight if this was showing, sync your flight to dji cloud and start a case with dji I’m sure they will see more in your .dat file from the aircraft.
2018-11-4
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DJI Stephen
DJI team
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Hi M4VERICK8. I am sorry to know what happeded to your friends previous flight. Since this issue happened the best thing you need to do is to open a ticket by creating an online repair request using this link https://repair.dji.com/repair/index. Please sync the flight records as well for further analysis on what happened to that flight.

2018-11-4
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JJBspark
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Hi,

Better ask DJI for support in this malfunction. Motor #1 and 2 were disconnected during flight, guess a double ESC failure.
In the video you can see (i think) that an blade is not spinning....

I have seen many flight with cell deviations > 150 mV between cells, and they did not fell out of the sky....So imo i do not think that this has something to do with the esc failure, at that time it was 42 mV.



cheers
JJB
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2018-11-4
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A CW
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M4VERICK8 Posted at 11-4 13:24
I thought that too. But he said there were no birds around the drone.

Strange - battery failure?
2018-11-4
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M4VERICK8
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hallmark007 Posted at 11-4 13:26
There’s isn’t a whole lot in your flight log.
But one thing would concern me, at the beginning of your flight there was a noticeable deviation in the battery of 0.15 which is a concern and if it was me I would not take flight if this was showing, sync your flight to dji cloud and start a case with dji I’m sure they will see more in your .dat file from the aircraft.

I’ve noticed that too. What caught my attention was that message in red. But, what really does it mean cell deviation?

Thx for the reply.
2018-11-4
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M4VERICK8
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JJBspark Posted at 11-4 13:34
Hi,

Better ask DJI for support in this malfunction. Motor #1 and 2 were disconnected during flight, guess a double ESC failure.

Thx jjbspark for your opinion, I trust your judgment. I’ve noticed the propeller wasn’t spinning. What about the motors? Where did you see it? Was in the log file?

Thx man
2018-11-4
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hallmark007
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JJBspark Posted at 11-4 13:34
Hi,

Better ask DJI for support in this malfunction. Motor #1 and 2 were disconnected during flight, guess a double ESC failure.

While we don’t know what happened here and I wouldn’t rule out battery problem, no one should take off when deviation is at .15v and I think you will find that dji would not recommend this and for those you have seen with higher values of deviation they should also be advised to land and change battery.
2018-11-4
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Djr01974
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Maybe the prop became unlocked from the motor.?
2018-11-4
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M4VERICK8
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hallmark007 Posted at 11-4 13:54
While we don’t know what happened here and I wouldn’t rule out battery problem, no one should take off when deviation is at .15v and I think you will find that dji would not recommend this and for those you have seen with higher values of deviation they should also be advised to land and change battery.

Very important information. Good to know!
2018-11-4
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M4VERICK8
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Djr01974 Posted at 11-4 13:58
Maybe the prop became unlocked from the motor.?

I have no idea. Could be!
2018-11-4
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JJBspark
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M4VERICK8 Posted at 11-4 13:48
Thx jjbspark for your opinion, I trust your judgment. I’ve noticed the propeller wasn’t spinning. What about the motors? Where did you see it? Was in the log file?

Thx man

hi m4verick8,

yes, its in the flight log written.

Keep us posted about your warranty claim.

cheers
JJB
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2018-11-4
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JJBspark
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hallmark007 Posted at 11-4 13:54
While we don’t know what happened here and I wouldn’t rule out battery problem, no one should take off when deviation is at .15v and I think you will find that dji would not recommend this and for those you have seen with higher values of deviation they should also be advised to land and change battery.

Hi hallmark007,

I hope that all forum members make up their own mind about the quality of analysis of 'experienced' guys on here. And after that make their own descision how to act on their info.

cheers
JJB

2018-11-4
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JJBspark
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M4VERICK8 Posted at 11-4 14:30
I have no idea. Could be!

Don`t think so. If unlocked the prop would 'fly' away from your drone and not stay attached and fall down with your drone. (see the pitch and roll angles when falling, a loose prop would not stay attached)
Just my 2 cents...

cheers
JJB
2018-11-4
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jacksonnai
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Malaysia
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Sorry to saw that hope you recover it
2018-11-5
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djiuser_QkzEjXXwr0Hd
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Anthony566 Posted at 11-4 13:12
Hmm not sure
This all seems to happen after a short cell deviation ...


O caso já foi passado p DJi...passarei os resultados aqui.
2018-11-5
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M4VERICK8
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JJBspark Posted at 11-4 23:16
hi m4verick8,

yes, its in the flight log written.

I see. We will keep you guys posted. Thx so much.
2018-11-5
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