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Crash into the sea - Processor Overheat
1677 24 2019-7-18
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Mickael Samama
Flight distance : 2368927 ft
France
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Hi all,

I lost my Mavic 2 Pro into the sea during a trip in Greenland with some weird behavior during the last flight. Just for your information, I have more than 500 flights, 72 hours of flight time and 720 km without any crash, I am always carefull with pre-flight check (batteries, hardware, sd card, etc...).

I was on boat and the flight was pretty good (GPS, Batteries, etc...) with good view of the M2P because I was always around me. There is three things that happened inside 36 seconds:
- 19m 15s : A landing without asking (no stick down, button, etc...), then I push the stick to the top to cancel that

- 19m 47s : A critical error with processor overheating
- 19m 48s : A RTH because of the batterie, but impossible to cancel (mutliple times) so we try to be under the Mavic
- 20s 11s : Mavic 2 Pro turn off and crash at 10 meters of us


Of course, I discovered all of the details inside the flight log. What I am supposed to do? It really seems to be a hardware issues and not on my side.


Let me know what do you think about that,

There is a link to see the flight log : https://app.airdata.com/share/FdAQIs/GENERALOverview

Mickael




2019-7-18
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hallmark007
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Couple of things log says 5500ft from home , so only 2 conclusion from this 1 you weren’t in VLOS or you were travelling around with craft somewhere close overhead, if the latter was the case then you almost certainly had set wrong RTH for flying over water with a boat, particularly if you were moving so much.

With regard to processor, I’m not sure this could be your saving grace with warranty.

RTH this could have been as a result of battery nearing its failsafe causing normal RTH , it was 5500 from homepoint so calculating distance it may have realised it couldn’t get home so started to land, it allowed you cancel first time but not second time .

Hopefully the processor may have been the cause of some malfunction I’m not so sure, but you should contact dji with your synced flight log.
Good luck .
2019-7-18
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Mickael Samama
Flight distance : 2368927 ft
France
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hallmark007 Posted at 7-18 06:33
Couple of things log says 5500ft from home , so only 2 conclusion from this 1 you weren’t in VLOS or you were travelling around with craft somewhere close overhead, if the latter was the case then you almost certainly had set wrong RTH for flying over water with a boat, particularly if you were moving so much.

With regard to processor, I’m not sure this could be your saving grace with warranty.

Thank you for your quick reply. It's my first mistake for the RTH but I never had the case, so now I know.

When it started to land, I didn't receive any message before that because I discovered that in the fight log, not during the flight.

Yes, I will contact dji about that but I wanted to know if someone experienced something weird like this.

Thank you,
2019-7-18
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JJB*
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Hiya,

At 19m15.5s VPS height was 0.6 meters, speed reducing to less than 1 m/s and short 100% down stick ; software thinks you wanted to land, its a user initiated forcedlanding.
Mayby the VPS height was incorrect measured above water, but for the system it was 0.6 meter so a user landing was forced.

At  19m28s  the batt level just enough to fly to the homepoint. (1602 meters away with 34% batt), this is a OK message/warning. This is just a message for you to act, no RTH automatically yet. This happend during the forced landing.

At 19m47 a warning " Surchauffe critique du processeur. L’appareil contrôle sa consommation énergétique et lance RTH" = critical overheating proc, a RTH will be initiated.At the end of the RTH (gohome) your MP2 did face home direction, was 66 now hdg home 332. VPS height 0.3 meters and going down to 0.0 meter.
Speed did increase and drone went little lower.....imo it just flew into the water!
Baro height at the end 38 meters to 33.8 meters, as your RTH height was 30 meters there was no need for your MP2 to get some safe height above the water.

In the last 6 seconds RTH flew the craft, no user input. Time before that craft was left yawing to reach home direction, so it was more or less turning at the spot.As said after reaching home heading, no user input and craft start to get some speed.

BTW  it should be possible to cancel a RTH (so don`t know what went wrong there), even if the RTH is initiated by software. Only a critical landing due to low power cannot be cancelled!

Sorry for your loss.

cheers
JJB






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2019-7-18
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DJI Tony
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Hi, we're sorry to know about the mishap that happens to your drone. We highly recommend syncing your flight records using the DJI Go 4 app and contact our support for us to initiate the investigation on the said incident flight. You may reach our support using the link below. Thank you for your support.

www.dji.com/support
2019-7-18
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Un Cercle
Flight distance : 2368927 ft
France
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JJB* Posted at 7-18 08:04
Hiya,

At 19m15.5s VPS height was 0.6 meters, speed reducing to less than 1 m/s and short 100% down stick ; software thinks you wanted to land, its a user initiated forcedlanding.

Hi,

Thank for taking the time. It's really weird because I never pushed the stick down to land, I checked in flight data inside the DJI Go app and the history show no action from me (no stick down).

And yes for the RTH, I was unable to cancel, I had the message multiple times in a row and each time, I was pressing cancel or cross icon to the left. It was exactly like the drone didn't reply to my actions after the overheat message.

Mickael
2019-7-18
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Un Cercle
Flight distance : 2368927 ft
France
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DJI Tony Posted at 7-18 08:13
Hi, we're sorry to know about the mishap that happens to your drone. We highly recommend syncing your flight records using the DJI Go 4 app and contact our support for us to initiate the investigation on the said incident flight. You may reach our support using the link below. Thank you for your support.

www.dji.com/support

Hi Tony,

Thank you. I initiated the investigation with your support and there is the number 2231761.

I am looking forward for an explanation,

Mickael
2019-7-18
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JJB*
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Un Cercle Posted at 7-18 10:51
Hi,

Thank for taking the time. It's really weird because I never pushed the stick down to land, I checked in flight data inside the DJI Go app and the history show no action from me (no stick down).

Hi Un Cercle,

Well, just a short 100% down (and some 94, 95%), i think just enough to trigger ForceLanding.

ForceLanding is only written into the log due to user input.

But DJI can tell you all, they are the specialists....

Had another look, GoHome started at a height 23.6 meter baro and 0.5 VPS height ; guess VPS height is not correct ; drone started to climb.It reaches 30 meter ( your RTH height setting ) and still climbing, this because the VPS measured 0.5 meter, guess sensor is wet salted ect.
Climbing above 30 meter due to the fact that VPS height is 0.5.
39.4 meter reached, speed starts to increase and height is dropping from 39 to 34 in the last record.
As it was close and you have seen falling it into the blue.

Battery temp at the end only 35 degrees, so was the processor overheated?

Reason for dropping ?  i hope for you that DJI will help you out.

cheers
JJB




cheers
JJB
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2019-7-18
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hallmark007
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JJB* Posted at 7-18 11:15
Hi Un Cercle,

Well, just a short 100% down (and some 94, 95%), i think just enough to trigger ForceLanding.

I don’t think forced landing is user initiated, forced landing warning (I think) comes when landing protection is turned off not certain about this though .
2019-7-18
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Montfrooij
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Sorry to hear and hope for the best with your case!
2019-7-18
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Un Cercle
Flight distance : 2368927 ft
France
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hallmark007 Posted at 7-18 12:13
I don’t think forced landing is user initiated, forced landing warning (I think) comes when landing protection is turned off not certain about this though .

I am pretty sure that I didn’t push the stick down because I was positioning the M2P for a side shot.

I hope to have a good answer from DJI yes.
2019-7-18
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JJB*
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Un Cercle Posted at 7-18 22:39
I am pretty sure that I didn’t push the stick down because I was positioning the M2P for a side shot.

I hope to have a good answer from DJI yes.

okee, no problem that you think you did not pushed stick down. The flightlog showes that you did, mayby you were not positive aware of that.

2019-7-18
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JJB*
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hallmark007 Posted at 7-18 12:13
I don’t think forced landing is user initiated, forced landing warning (I think) comes when landing protection is turned off not certain about this though .

hi hallmark, ForceLanding is written in the log when the user initiates a landing.

A normal manual landing ( from hover low above the ground) in done by momentarely push 100% down, recognized by sw and landing is ecexuted. Releasing stick does not stop the landing, only 100% up will cancel this ForceLanding. My MA has landing protection ON and writes forcelanding when i perform a manual landing.

In this log you can see that the Forcelanding is cancelled by short 100 Up.

Problem is that the SW uses the VPS height as one of the checks for this, so flying high with a wrong measured VPS height ( as in this flight) users can initiates a forcelanding without knowing it !

cheers
JJB
2019-7-18
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hallmark007
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JJB* Posted at 7-18 23:52
hi hallmark, ForceLanding is written in the log when the user initiates a landing.

A normal manual landing ( from hover low above the ground) in done by momentarely push 100% down, recognized by sw and landing is ecexuted. Releasing stick does not stop the landing, only 100% up will cancel this ForceLanding. My MA has landing protection ON and writes forcelanding when i perform a manual landing.

Yes I see what your saying, but also VPs turns off when operator initiates landing this is not called in log as forced landing, which is why I said that maybe landing protection may have been turned off.
2019-7-19
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HereForTheBeer
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long time no see.. i want to chime in and say that i seen it on few occasions where mavic air for example looses a bit of ALT while flying, hardly noticeable but just wanted to chime and say that.

also i wish DJI would  incorporate a Lidar or something for VPS for further distances for VPS to work from with more accurate reading
2019-7-19
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El Diabolico
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HereForTheBeer Posted at 7-19 06:50
long time no see.. i want to chime in and say that i seen it on few occasions where mavic air for example looses a bit of ALT while flying, hardly noticeable but just wanted to chime and say that.

also i wish DJI would  incorporate a Lidar or something for VPS for further distances for VPS to work from with more accurate reading

...and a Sonar to communicate with whales.
2019-7-19
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AntDX316
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The M2P died because of old age/wear and tear.  Everyone on Earth physically cannot live forever.  It was its time.
2019-7-19
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David Martin Graff
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Sorry to hear about your incident and best of luck with your case!
2019-7-20
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Un Cercle
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David Martin Graff Posted at 7-20 00:47
Sorry to hear about your incident and best of luck with your case!

Thanks, I hope too.
2019-7-20
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David Martin Graff
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Un Cercle Posted at 7-20 04:05
Thanks, I hope too.

....
2019-7-20
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HereForTheBeer
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AntDX316 Posted at 7-19 23:04
The M2P died because of old age/wear and tear.  Everyone on Earth physically cannot live forever.  It was its time.

unlikely the problem.  these drones are well engineered to last.  i put nearly 1000 miles of flight on the original mavic pro before selling it and it didnt really seem like it was having a problem with milage and runtime it was suffering apart from the batteries were seeing wear and tear....  but thats expected for batteries to wear faster than the rest of the aircraft specially when you are me and dont treat them ideally...but the motors, camera, esc's were all perfectly happy and where it started from it seemed was a stable as always when i sold it.   
2019-7-21
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AntDX316
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HereForTheBeer Posted at 7-21 01:37
unlikely the problem.  these drones are well engineered to last.  i put nearly 1000 miles of flight on the original mavic pro before selling it and it didnt really seem like it was having a problem with milage and runtime it was suffering apart from the batteries were seeing wear and tear....  but thats expected for batteries to wear faster than the rest of the aircraft specially when you are me and dont treat them ideally...but the motors, camera, esc's were all perfectly happy and where it started from it seemed was a stable as always when i sold it.

I think all the sand ruined it.  When I had my first P4PV2.0 even the sand blowing on it while getting ready can notchy the controller sticks.  I assume when the stand gets in the motors after that many years it can eat away at the windings of the motors and cause some sort of failure from the abrasion.  
2019-7-21
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Un Cercle
Flight distance : 2368927 ft
France
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DJI Tony Posted at 7-18 08:13
Hi, we're sorry to know about the mishap that happens to your drone. We highly recommend syncing your flight records using the DJI Go 4 app and contact our support for us to initiate the investigation on the said incident flight. You may reach our support using the link below. Thank you for your support.

www.dji.com/support

Hi,

I don’t have any news about my case. Can I have one please?

There is the number: CAS-3327724-V2J2P3

Thank you,

Mickael
2019-7-30
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Un Cercle
Flight distance : 2368927 ft
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Hi all,

Just to let you know that the incident was out of my control. So, they decide to send me a new Mavic 2 Pro (no controller, etc...).

Thank you DJI for the support, really appreciated, and for the people that reply to my post.

Mickael
2019-7-31
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DAFlys
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Un Cercle Posted at 7-31 03:06
Hi all,

Just to let you know that the incident was out of my control. So, they decide to send me a new Mavic 2 Pro (no controller, etc...).

Congratulations and thanks for letting us know.  There's a lot of negativity about warranty on here and getting a replacement based off just the logs is great.
2019-7-31
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