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Mavic suddenly falls from the sky
159 7 4 days ago
ab22
Beginner
Australia
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Hi Everyone, flying my new Mavic yesterday, i was taking some shots of surfers sitting about 10m off the beach and was 7m high so well clear of danger with 78% battery on both Drone and Controller. I switched to active track and selected a target, which then ended up passing under the drone and out of its field of view. Before i even had the chance to turn the drone around, i looked up to see the drone simply fall out of the sky into the surf.
Having thought i was at fault i checked the log and it shows the drone fly into positing hover for 10 seconds then when active track is selected it just rapidly drops with no record of the joysticks being touched. Even if it was attempting to land for whatever reason it should have lowered and pulled up slightly as it normally does when landing, but instead fell like a brick into the surf. From watching it, it looked as if everything just turned off and it dropped.
To my understanding i cant see anything i have done to cause the drone to just cut power and drop, but thought i would check before going down the faulty unit path. Has this happened to anyone else where it just cuts power and drops? Is this issue somehow related to active track feature?


Thanks in advance for your help.
4 days ago
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hallmark007
First Officer
Ireland
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Have you checked for irregularities in the battery, you should see this in your logs, I would also make sure you sync your flight to dji cloud in the app.
4 days ago
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DJI Mindy
Moderator
Japan
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Really sorry to hear about your experience.
Did you recover your drone?
Please sync your flight records from the DJI Go app and send an email to support@dji.com with your DJI account email and the date this occurred.
They can analyze the data and let you know what could have caused the issue.
4 days ago
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ab22
Beginner
Australia
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Thanks for your response hallmark007 had a look at the Battery data and everything says normal.

Thanks DJI Mindy will send everything over.
4 days ago
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DJI Mindy
Moderator
China
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ab22 Posted at 2017-3-19 18:04
Thanks for your response hallmark007 had a look at the Battery data and everything says normal.

Thanks DJI Mindy will send everything over.

If you have any further query, please feel free to let me know.
Click the "reply" button so I can see you are responding to me.
4 days ago
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n_rapallo
Hobbyist
Canada
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While my Mavic Pro didn't lose power mid-flight it nevertheless crashed to the ground under similar circumstances when using the Point of Interest tracking mode (for the first time).

In my case, I ascended to a height of about 180ft and hovered there while engaging the Point of Interest mode.  I flew out to a radius of about 60ft and just as I was adjusting the gimbal view to point at my point of interest to do the fly around, it proceeded to fly erratically without any input from the controller.

I could see/hear the Mavic Pro was in distress (it started to descend!!), and efforts to lift/raise the Mavic back up met with no success.  

I watched it crash to the ground and in the process breaking the gimbal connection off the Mavic and busting off one rear rotor motor.

I too don't know what really happened and have started the process to have it repaired.  I was using the android DJI GO 4 version 4.0.4 with a Samsung S6 Edge phone with the latest firmware (.500).  I got three warning messages: Two mid-air (1) Motor Idling (Loose or Missing Propeller) and (2) Warning Braking now! Return sticks to midpoints first. The third it seems while it was on the ground (3) Warning Weak Signal. Avoid being blocked or adjust the antenna direction.

My flight log is available for analysis here.

Anyone heard of other instances where the Special Tracking modes have been at fault for a crash?

Regards,
-Nick
2 days ago
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Håkan K
Hobbyist
Sweden
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n_rapallo Posted at 2017-3-21 13:19
While my Mavic Pro didn't lose power mid-flight it nevertheless crashed to the ground under similar circumstances when using the Point of Interest tracking mode (for the first time).

In my case, I ascended to a height of about 180ft and hovered there while engaging the Point of Interest mode.  I flew out to a radius of about 60ft and just as I was adjusting the gimbal view to point at my point of interest to do the fly around, it proceeded to fly erratically without any input from the controller.

It appears you had issues already before entering the POI mode. If looking at your data and the map it never became a circle which a POI will make.  To me it looks like an issue with either the motor or what is driving it. Or maybe as the warning messge says a propeller came loose. Was your propellers looking OK after the crash?
1 day ago
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n_rapallo
Hobbyist
Canada
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Håkan K Posted at 2017-3-22 09:24
It appears you had issues already before entering the POI mode. If looking at your data and the map it never became a circle which a POI will make.  To me it looks like an issue with either the motor or what is driving it. Or maybe as the warning messge says a propeller came loose. Was your propellers looking OK after the crash?

You may be right... the issues started just before (or as I was) engaging that POI mode.

About 30 seconds after take-off, I opened the Point of View mode while the Mavic was hovering 180ft (60m) above. Everything appeared stable and I had good GPS and remote controller connections. Nothing seemed wrong.  The props were ok then and working fine for the first minute or so.

As I setup the point of interest to fly around, I quickly focused at infinity (far away point) and then adjusted the gimbal down to the center of interest, just before (or as I was) engaging the POI mode.  I actually thought I started the mode then, as I saw the Mavic fly off on its own (but sadly only to witness it fall from the sky). No pictures had yet been taken on this flight.

To see this flight in 3D, I reviewed the .kml file available at HeathlyDrones.com with Google Earth Pro and see it seems the Mavic might have even started its arc around (counter-clockwise)... by itself, but then a few seconds later suffered prop/rotor distress.  After crashing to the ground, one rear rotor motor busted off and had no prop. The front motor on that same side had its arm ripped from the socket by the impact and also had no prop.  The other side had its props, though only one seem to survive intact.  

The ground was grassy but frozen and has since become snow covered again.  I'm going to go out when the weather improves (here in Canada) to see what remains I can find...

Regards,
-Nick
1 day ago
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