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Phantom 4 Advanced Crashed After Takeoff
874 10 2017-12-23
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ry_guy_chi
lvl.2
United States
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Hi, I experienced a crash that occurs within 60s of takeoff. Seeing that it was chilly, I put the drone in the air to let it hover for a couple minutes (my intention). It was hovering stable. I had just flown in the area with no issues and brought it down to put in a full battery. After a few moments passed the P4A was moving without my input. I had no control over the pitch and yaw. It only responed to my pulling the left stick all the way down. It came close to the ground and landed upside down. Really no signs of damage; just on broken prop. I uploaded the flight logs and was hoping that someone could help me interperate if it was my fault or if it was the drone that ran into an issue. If it was the latter, what would my next step be? Thank you in advanced.

http://app.airdata.com/main?share=kwleOy
2017-12-23
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ALABAMA
Captain
Flight distance : 10442687 ft
United States
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Follow these instructions to post the flight LOG here.        http://www.phantomhelp.com/logviewer/upload/
2017-12-23
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ry_guy_chi
lvl.2
United States
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http://www.phantomhelp.com/logviewer/QDAMN6I8LO3CMV2Y7LRQ/
2017-12-23
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ALABAMA
Captain
Flight distance : 10442687 ft
United States
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26 degrees is pretty cold when changing a battery. Looked like it warmed up though.  Was that a metal fence next to where you took off from?
2017-12-23
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ry_guy_chi
lvl.2
United States
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ALABAMA Posted at 2017-12-23 18:19
26 degrees is pretty cold when changing a battery. Looked like it warmed up though.  Was that a metal fence next to where you took off from?

Yes about waist high, however I was ~20 feet from it and I did take off from the same spot just before changing the battery and did not have an issue.
2017-12-23
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ry_guy_chi
lvl.2
United States
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ry_guy_chi Posted at 2017-12-23 19:05
Yes about waist high, however I was ~20 feet from it and I did take off from the same spot just before changing the battery and did not have an issue.

Also, I did check the sensors before taking off and nothing seemed off. Just nervous about what to do next? I recalibrated the IMU and gimbal on a level surface once home. I have not flown it since. I started the motors and everything seems operational. I just don’t know if this is a warrenty issue?
2017-12-23
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DJI Susan
Administrator

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Hello there, I'm sorry to read the crash. Please kindly send it in for diagnosis and repair: https://www.dji.com/support Data analysis is suggested if the drone is still in warranty period. We will offer you the corresponding solutions based on the analysis result.
2017-12-23
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Vendex
First Officer
Flight distance : 14953146 ft
Bulgaria
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ry_guy_chi Posted at 2017-12-23 19:08
Also, I did check the sensors before taking off and nothing seemed off. Just nervous about what to do next? I recalibrated the IMU and gimbal on a level surface once home. I have not flown it since. I started the motors and everything seems operational. I just don’t know if this is a warrenty issue?

Did you read the message about cold battery?
2017-12-24
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Aardvark
Captain
Flight distance : 384432 ft
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United Kingdom
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ry_guy_chi Posted at 2017-12-23 18:04
http://www.phantomhelp.com/logviewer/QDAMN6I8LO3CMV2Y7LRQ/

Did you calibrate the compass at all ?
2017-12-24
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ry_guy_chi
lvl.2
United States
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Aardvark Posted at 2017-12-24 06:16
Did you calibrate the compass at all ?

Was there a need to? I had just flown in that exact location moments prior with no issue. I just swapped batteries.
2017-12-24
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Aardvark
Captain
Flight distance : 384432 ft
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United Kingdom
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ry_guy_chi Posted at 2017-12-24 10:09
Was there a need to? I had just flown in that exact location moments prior with no issue. I just swapped batteries.

No there wouldn't have been a need to normally, usually one good calibration is sufficient. It's just that the erratic behaviour that is described, along with the compass errors showing in the record might suggest a bad compass calibration. Or perhaps magnetic interference close to your proximity, any large metal structures or reinforcing very close to take off point ?


Edit:- The 'GPS Position NoMatch' errors at start of flight, to me would indicate a possible conflict between the GPS and compass data.
2017-12-24
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