Hello,
had an interesting crash of my mavic pro platinum last weekend, wanted to share the experience in the forum, maybe will be some ideas why it might happened. For me it looks like broken propeller. Flight log uploaded here - https://www.phantomhelp.com/LogViewer/5GQVGV1REDMVFKLI0AAA/

I took my mavic to homestead, flew little bit around, then brought it up, went ~1km away on sports mode, already started getting back, it started to spin around like crazy, no control was possible, then lost link pretty fast, thought it already crashed into some trees, but then heard a noise, it was comming back to starting point, still spinning around, like helicopter without it's tail rotor (good automatic return system, wouldn't be possible on manual control), return to home was set at 40 meters, so it went back to it's starting point and just crashed having free fall, don't remember if video feed was available on this free fall, was looking at the drone. I had recording enabled, file weights 4gb, but it's unreadable.
When it fall down, had only 3 full propellers in place, one was completely broken off. Is it possible that during flight it lost one side of the proppeler and then when lining up for return to home landing lost another half or maybe battery overheated.

With regards to the video, if you have not messed with either the card or the drone put the card and a fresh battery back into the drone and try to switch the drone on. If it switches on leave it for a minute or so then switch it off and try the card in your reader. There is a chance that this will fix or close the video properly.

With regards to the drone, in the folder where you found the DJIFlightRecord_2022-03-19_[18-05-29].txt  flightlog there should be another folder named MCDatFlightRecords or something like that. In there there may be a DAT flight log with a name that ends FLY023.DAT but the same date as your txt flight record but a slightly earlier time stamp. If you can find that file can you up load it to here?

Sean-bumble-bee Posted at 3-24 09:28
With regards to the video, if you have not messed with either the card or the drone put the card and a fresh battery back into the drone and try to switch the drone on. If it switches on leave it for a minute or so then switch it off and try the card in your reader. There is a chance that this will fix or close the video properly.

With regards to the drone, in the folder where you found the DJIFlightRecord_2022-03-19_[18-05-29].txt  flightlog there should be another folder named MCDatFlightRecords or something like that. In there there may be a DAT flight log with a name that ends FLY023.DAT but the same date as your txt flight record but a slightly earlier time stamp. If you can find that file can you up load it to here?

Many thanks for reply, I found other file you mentioned too, uploaded here https://file.io/wTJUPWuxg6X6
Does it have more information than txt file?

Hi,

Sorry for your incident!

But is is really amazing!!  Your MP spinning around and able to Return to Home.
Never saw this before in any log.

see my chart of your data.
Bottom red line in the actual move line direction, the purple line shows drone heading.

In the log warning " Motor Obstructed" , wich in DJI terms means it does rev below certain thresshold, or ofcourse is indeed totally blocked.But with a totally blocked motor your drone could not fly like it did.

Mayby more in the DAT file, but your link does not work.

cheers
JJB

Orion77 Posted at 3-24 09:55
Many thanks for reply, I found other file you mentioned too. Does it have more information than txt file?

It contains more technical information about the actual drone......including the motor speeds.

Very interesting incident data.


Something unusual started happening at 5:50.6.
The normal max tilt angle in Sport Mode is 35° but for a few seconds yours was pitching at up to 47° with full stick in Sport Mode and then went back to normal.
You flew further in Sport Mode, then hovered a while before pushing it again in Sport Mode.
When you gave it full stick at 7:18.5 the tilt angle went to 45-50° and even reaching 60° at one point.
This lasted for approx 25 seconds
With this crazy tilt, the roll angle was normal and the drone flew straight, but lost height (due to the abnormally large tilt angle).

At 7:43.4, the drone rolled hard to the right, rolling through a full 180° and eventually settling with a roll angle of about 40° to the left after you centred the joysticks.
As well as rocking and rolling, the drone was also spinning clockwise.

During the 45 seconds of of crazy tilting and severe rolling, the drone lost 1500 ft of altitude and there were numerous warnings of Speed Error. Motor is Blocked.

At 8:03.3 signal was lost which triggered Failsafe RTH.
When signal returned at 8:40.8 the drone was coming home and maintaining altitude, pitch and roll angles were almost normal, but the drone was spinning, but now it was anticlockwise!!!
The drone came home and started to descend and signal was lost with it still 123 feet above the launch point.
The final fall was most likely due to loss of power due to the battery  dislodging, but it's hard to understand how it stayed in place so long  before letting go.

The reason for the excessive tilt angle is a mystery.
The rolling and spinning indicates some degree of loss of a propeller or motor
That the drone could maintain level flight and hold altitude in RTH indicates that the drone had not lost a complete propeller or motor.
Loss of one prop blade is a likely cause of the incident.

Hello there Orion77. I am sorry to read and to know what happened to your DJI Mavic Pro Platinum and thank you for sharing these information. Since this unfortunate event happened to your DJI Mavic Pro Platinum. It would best for you to contact our DJI Support Team at https://www.dji.com/support?site=brandsite&from=nav for further assistance with regards to this matter. We will do there best to help you and give out the best resolution for the said issue. Again, I am sorry and thank you.

Labroides Posted at 3-24 15:34
Very interesting incident data.

Hi

Indeed very interesting log.

About that mystery, i think like this:
At 5.50.6 the OP released full fdw stick flying full speed, so MP did a max brake action.
Pitching up, speed rapidly to zero.

Had not noticed myself the clockwise and anti-clockwise rotation! wow, amazing how this drone could fly like this.
Hope to see the DAT file for motor revs.

cheers
JJB

Hey guys, thanks a lot for your interest and crash analysis, looks like last upload of dat file was deleted too quickly, I have put it in my server now:
http://www.improvizus.lt/22-03-19-06-04-50_FLY023.DAT

this file is from mobile phone, would there any more information in the drone itself? Would be able to extact it on weekend.

DJI Stephen Posted at 3-24 19:01
Hello there Orion77. I am sorry to read and to know what happened to your DJI Mavic Pro Platinum and thank you for sharing these information. Since this unfortunate event happened to your DJI Mavic Pro Platinum. It would best for you to contact our DJI Support Team at https://www.dji.com/support?site=brandsite&from=nav for further assistance with regards to this matter. We will do there best to help you and give out the best resolution for the said issue. Again, I am sorry and thank you.

Hello, I wonder what good the contacting might do, it's out of warranty for several years, no dji care insurance etc.

Orion77 Posted at 3-25 02:52
Hello, I wonder what good the contacting might do, it's out of warranty for several years, no dji care insurance etc.

You are correct.
It won't do any good and DJI would charge you for data analysis (and give less explanation)

Orion77 Posted at 3-25 02:50
Hey guys, thanks a lot for your interest and crash analysis, looks like last upload of dat file was deleted too quickly, I have put it in my server now:
http://www.improvizus.lt/22-03-19-06-04-50_FLY023.DAT

Hi,

Thanks for the DAT

In the log at
4m0s > few times > propulsion Spd-Cur fault:1
7m1s > Aircraft install warning!:aircraft vibration err(3)
7m3s > craft ctrl failed!!!
7m22s > fault on . esc(4) is stall
7m37s > motor is continued stall

Rear Right Motor rpm to almost zero for short moment, Left Rear also lower in revs.

See your DAT data in my chart.
I am not a DAT specialist, but it is obvious to be a propulsion fail.

Cheers
JJB

Hey guys, thanks again for your answers and analysis, I have some updates regarding the matter,
first good news, drone is now fixed with original parts, replaced: top case, middle case, camera holder, camera and some internal cables, right front and back legs together with motors replaced.

I have also extracted the video of the incident https://www.youtube.com/watch?v=7sY8CHM4xE8 (youtube now processing HD version, might take few ours) turns out it crashed into trees and then recovered,  but started to spin, looks like impact made it to start the right back motor again?

Since there was a problem with right rear motor and now it's brand new, I hope everything will be fine in the future flights, but still makes me wonder did it lost the propeller blade during the flight or motor itself malfuncted, which doesn't look very likely it has only 10,11,9 battery cycles (3 batteries) so even it's few years old, doesn't have many flights.

PS. attaching the picture of fixed device.

Orion77 Posted at 3-26 04:12
Hey guys, thanks again for your answers and analysis, I have some updates regarding the matter,
first good news, drone is now fixed with original parts, replaced: top case, middle case, camera holder, camera and some internal cables, right front and back legs together with motors replaced.

Would love to hear how you fixed your Mavic in such a short period. I guess you were able to "snap" the pieces back into place or did you find replacement parts close by?

Thank you I made a new thread
https://forum.dji.com/forum.php?mod=viewthread&tid=265248

Moved discussion to new thread