Loss of connection.....loss of drone

[Nakita Mosquita]

4 months old..... 250 flights...... never any issues. 2 minute flight on the weekend and lost my air in the water. Flew extensively over water while in Kaui for 3 months. Have submitted the log and video to DJI. They confirmed all was well....18 sats locked on.... home point recorded with precision take off. Went up 30 m, then 200 m horizontally over water.... took first video, then a 2nd.... lost my connection and never saw the air again. I have it configured to Return to home if signal is lost. It did not. DJI concluded it was fine until the log ended and could not determine anything further. Duh!!!

Extremely annoyed. DJI is offering a mere 30% off the cost of just the drone for approx $530 Cdn dollars.

What do you think?

 

[sar104]

Without seeing the logs I don't know what to think.

 

[MAvic_South_Oz]

Sucks for sure, sorry you lost it that way.
I've read another thread recently where RTH didn't function, expect there was no reason it shouldn't have done that for you, no obstacles, not too low, etc.

Maybe if you post up links to the flight log viewer info, and possibly the dat file, people here can let you know if anything they can spot here.
My brother in law lost his Air the other day, totally his fault.

 

[Nakita Mosquita]

DJI Wrote:
The aircraft was piloted under GPS mode after taking off and it responded to the pilot's control well. The home point: 45.3609416 -80.0167374;
2. T=03:23, H=49.9 m, D=98.9 m, Battery 77 %, the pilot moved the rudder stick rightward, then the flight record ended. The last recorded coordinate: 45.3602053 -80.0159627.

As the record ended, we could not verify what happened afterward.

 

[Nakita Mosquita]

Without seeing the logs I don't know what to think.

How do I upload the log?

 

[Nakita Mosquita]

Without seeing the logs I don't know what to think.

Please take a look ....I'm looking for answers.

 

[sar104]

Please take a look ....I'm looking for answers.

The flight log stops abruptly, which is what DJI likely noticed, and when they cannot determine what happened then they typically just offer 30% discount. However, they should have checked the event stream in the DAT file, which clearly shows some kind of hardware failure:

155.451 : {task_e}INFO:i2c3 core recovery||​

155.452 : {task_e}INFO:[I2C-L623]:bus_idle time out! MA:1, TFE:0​

155.452 : {task_e}INFO:i2c3 Critical error in master_xfer ||​

155.452 : {task_e}INFO:Critical ERROR:i2c3 i2c_queue_start fail||​

155.452 : {task_e}INFO:i2c 3 sync xfer fail - 20039b68 --14 ||​

155.466 : {task_e}INFO:i2c3 core recovery||​

155.466 : {task_e}INFO:[I2C-L623]:bus_idle time out! MA:1, TFE:0​

155.466 : {task_e}INFO:i2c3 Critical error in master_xfer ||​

155.466 : {task_e}INFO:Critical ERROR:i2c3 i2c_queue_start fail||​

155.466 : {task_e}INFO:i2c 3 sync xfer fail - 20039b68 --14 ||​

155.486 : {task_e}INFO:i2c3 core recovery||​

155.506 : {task_e}INFO:i2c3 core recovery||​

155.506 : {task_e}INFO:[I2C-L623]:bus_idle time out! MA:1, TFE:0​

155.506 : {task_e}INFO:i2c3 Critical error in master_xfer ||​

155.506 : {task_e}INFO:Critical ERROR:i2c3 i2c_queue_start fail||​

155.506 : {task_e}INFO:i2c 3 sync xfer fail - 20039a68 --14 ||​

155.529 : {task_e}INFO:i2c3 core recovery||​

155.530 : {task_e}INFO:smbus_read CMD_PRESENT_STATE error||​

That's not a set of errors I've seen before, but DJI should replace it free of charge. I would call them and escalate the issue.

 

[Joe4flight]

The flight log stops abruptly, which is what DJI likely noticed, and when they cannot determine what happened then they typically just offer 30% discount. However, they should have checked the event stream in the DAT file, which clearly shows some kind of hardware failure:

155.451 : {task_e}INFO:i2c3 core recovery||​

155.452 : {task_e}INFO:[I2C-L623]:bus_idle time out! MA:1, TFE:0​

155.452 : {task_e}INFO:i2c3 Critical error in master_xfer ||​

155.452 : {task_e}INFO:Critical ERROR:i2c3 i2c_queue_start fail||​

155.452 : {task_e}INFO:i2c 3 sync xfer fail - 20039b68 --14 ||​

155.466 : {task_e}INFO:i2c3 core recovery||​

155.466 : {task_e}INFO:[I2C-L623]:bus_idle time out! MA:1, TFE:0​

155.466 : {task_e}INFO:i2c3 Critical error in master_xfer ||​

155.466 : {task_e}INFO:Critical ERROR:i2c3 i2c_queue_start fail||​

155.466 : {task_e}INFO:i2c 3 sync xfer fail - 20039b68 --14 ||​

155.486 : {task_e}INFO:i2c3 core recovery||​

155.506 : {task_e}INFO:i2c3 core recovery||​

155.506 : {task_e}INFO:[I2C-L623]:bus_idle time out! MA:1, TFE:0​

155.506 : {task_e}INFO:i2c3 Critical error in master_xfer ||​

155.506 : {task_e}INFO:Critical ERROR:i2c3 i2c_queue_start fail||​

155.506 : {task_e}INFO:i2c 3 sync xfer fail - 20039a68 --14 ||​

155.529 : {task_e}INFO:i2c3 core recovery||​

155.530 : {task_e}INFO:smbus_read CMD_PRESENT_STATE error||​

That's not a set of errors I've seen before, but DJI should replace it free of charge. I would call them and escalate the issue.

Wow Budwalker! Your analysis is fantastic! How are you able to make sense out of the DAT file posted? Being a bit of a newbie, I’m still focusing on flying and have not spent much time in front of the computer looking at flight records.

 

[Grumpy D]

Wow Budwalker! Your analysis is fantastic! How are you able to make sense out of the DAT file posted? Being a bit of a newbie, I’m still focusing on flying and have not spent much time in front of the computer looking at flight records.

By the way that was sar104 not BudWalker.

 

[Joe4flight]

My apologies. Nice work sar104!

 

[sar104]

By the way that was sar104 not BudWalker.

Using @BudWalker's invaluable DatCon software to read the files though...

 

[Bruce Lythe]

I had an Air Comms failure which reset my tablet. Very similar to OP. How do I read the DAT file? Please advise?

 

[Nakita Mosquita]

I am very pleased with the outcome working with DJI. Must acknowledge the experience of Sar and his help interpreting the event log. DJI initially offered a 30% reduction but reviewed my case again and examined the Event stream and concluded they would replace my MA free with a new battery and props. Once the determination had been made, the replacement was sent out within 1 day UPS out of California. Now the excitement of receiving new bird. My experience with DJI has been great with regular and prompt email replies and quick communication re the status of my case. Will spend time testing and understanding RTH features. Excitement of finding out they would replace nicely offset the feeling of loss of my MA.

 

[sar104]

I am very pleased with the outcome working with DJI. Must acknowledge the experience of Sar and his help interpreting the event log. DJI initially offered a 30% reduction but reviewed my case again and examined the Event stream and concluded they would replace my MA free with a new battery and props. Once the determination had been made, the replacement was sent out within 1 day UPS out of California. Now the excitement of receiving new bird. My experience with DJI has been great with regular and prompt email replies and quick communication re the status of my case. Will spend time testing and understanding RTH features. Excitement of finding out they would replace nicely offset the feeling of loss of my MA.

Good to hear - that was the appropriate outcome. Sometimes DJI support just needs some encouragement to look a bit deeper into the logs.

 

[John MacAulay]

Great job, @sar104. Without your hard work and dedication, yet another drone pilot would have been out of pocket with their mishap. Your (and others) assistance on this group is invaluable.

 

[Nakita Mosquita]

Absolutely. No substitute for experience.

 

[Dark Horse]

I think Sar104 deserve a bottle of what he likes to drink ???‍Lol.

 

[hewo]

Four months twohundredfifty flights
Mortality expectation of electronic longevity?

or one year warranty from january2019 extrapolates to 750 flights no mortality?

 

[NAVMAV]

How do we talk "Sar104" into running for President?

Fuhgeddaboutit; we NEED him here!

Rgds, NAVMAV

 

[sar104]

How do we talk "Sar104" into running for President?

Fuhgeddaboutit; we NEED him here!

Rgds, NAVMAV

Thanks for the vote of confidence. As it happens, I would not be eligible.