Flight log doesn't show last couple of flights+the crash

offtheback · Nov 16, 2019

I looked at flight records from my Crystal Sky.Missimg last flight or 2.Is that where you get the data to determine cause of a crash or does the drone have the data?I tried plugging the drone USB C to my computer but nothing shows up.I'd like to know what happened before I send it in.Took off with warmish battery in 35degrees F full charge,and 1000 feet out gave a critically low battery warning and force landed.Landed on marsh grass but by the type I got guy with boat tide came in.Off to Care Refresh.

DanMan32 · Nov 16, 2019

You can get the DAT logs exported from the AC using Assistant, but you won't be able to read them as only DJI can encrypt or decode them.

If the flight log entry seems missing from the list in the app, the TXT logs may have fragmented for the flight. PhantomHelp probably can still read them. Concatenating them may also work in having them show up in the list. Make backups of the files before trying though.

sar104 · Nov 16, 2019

How are you determining that the logs are missing? Are you looking at the txt logs or the DAT logs?

How to retrieve a TXT log: DJI Flight Log Viewer | Phantom Help

How to retrieve a mobile device DAT file: How to retrieve a V3.DAT from the tablet

DanMan32 · Nov 16, 2019

Probably from the app flight log. That happened to me when the app crashed and split the log for the flight. App flight log only showed I think the end of the flight, yet TXT files were there for beginning of flight as well.

BudWalker · Nov 16, 2019

DanMan32 said:
Probably from the app flight log. That happened to me when the app crashed and split the log for the flight. App flight log only showed I think the end of the flight, yet TXT files were there for beginning of flight as well.

It's also the case that a .DAT log file produced by the Go App can be split into multiple .DATs. Those multiple .DATs can then be concatenated to create a single .DAT that. I suspect you're referring to the flight in this post
Drift to right, IMU calibration?
where there Go App produced 4 .DATs. Those were concatenated to produce this .DAT
FLY076.DAT

DanMan32 · Nov 16, 2019

It's the TXT files that are used to populate the flight log UI though, not the DAT, and I believe OP is referring to the flight log UI.

offtheback · Nov 16, 2019

sar104 said:
How are you determining that the logs are missing? Are you looking at the txt logs or the DAT logs?

How to retrieve a TXT log: DJI Flight Log Viewer | Phantom Help

How to retrieve a mobile device DAT file: How to retrieve a V3.DAT from the tablet

The link doesn't work.

This link For Android mobile devices, connect your mobile device to a computer via a USB cable and go to

DJI\dji.go.v4\FlightRecord (for DJI GO 4).

offtheback · Nov 16, 2019

DanMan32 said:
You can get the DAT logs exported from the AC using Assistant, but you won't be able to read them as only DJI can encrypt or decode them.

If the flight log entry seems missing from the list in the app, the TXT logs may have fragmented for the flight. PhantomHelp probably can still read them. Concatenating them may also work in having them show up in the list. Make backups of the files before trying though.

Thanks and thanks for word of the day!concatenated

sar104 · Nov 16, 2019

offtheback said:
The link doesn't work.

This link For Android mobile devices, connect your mobile device to a computer via a USB cable and go to

DJI\dji.go.v4\FlightRecord (for DJI GO 4).

Both those links are valid and work just fine.

offtheback · Nov 16, 2019

sar104 said:
Both those links are valid and work just fine.

This is what I got.I managed to copy flight records off the Crystal Sky and got txt files

sar104 said:
Both those links are valid and work just fine.

Here are the last 6 files I got.Top files are the latest. Thanks for your help.And a last photo before the incoming tide got it.Took 2 hours to find someone with a boat?

DJI Flight Log Viewer - PhantomHelp.com

DJI Flight Log Viewer - PhantomHelp.com

DJI Flight Log Viewer - PhantomHelp.com

DJI Flight Log Viewer - PhantomHelp.com

DJI Flight Log Viewer - PhantomHelp.com

DJI Flight Log Viewer - PhantomHelp.com

sar104 · Nov 16, 2019

Had you charged the battery recently, or had it been sitting for some time after charging? The cell voltages, and cell 3 especially, collapsed after you switched to sport mode:

offtheback · Nov 16, 2019

Thank you.They were all charged a day+a half before the flight.3 batteries flown just before that one were fine.The battery in the crash had about 122 cycles and was manufactured 8/2018.Until a few months ago I was charging batteries fully right after a flight and now charge only to 60% or so.I noticed that the log said on several flights with different batteries that the level was 100% at takeoff then dropped to 84% and never went lower.Is that a bug in the file?

DanMan32 · Nov 17, 2019

It's a bug in the Phantomhelp system. You can ignore it.

offtheback · Nov 17, 2019

DanMan32 said:
It's a bug in the Phantomhelp system. You can ignore it.

Thanks

offtheback · Nov 17, 2019

sar104 said:
Had you charged the battery recently, or had it been sitting for some time after charging? The cell voltages, and cell 3 especially, collapsed after you switched to sport mode:

View attachment 85788

View attachment 85789

Do I assume correctly that because the drone+battery are out of factory warranty I will still need to use care refresh and pay the deductible of $120?

sar104 · Nov 17, 2019

offtheback said:
Do I assume correctly that because the drone+battery are out of factory warranty I will still need to use care refresh and pay the deductible of $120?

That's correct.

DanMan32 · Nov 17, 2019

Someone reported they were able to get DJI to cover a swollen battery. He had to send a video showing the swelling, and on receipt of replacement, video of destruction of bad one by dunking in salt water.

offtheback · Nov 17, 2019

sar104 said:
That's correct.
[/QU

DanMan32 said:

Someone reported they were able to get DJI to cover a swollen battery. He had to send a video showing the swelling, and on receipt of replacement, video of destruction of bad one by dunking in salt water.

Click to expand...

I've had swollen batteries just past warranty.email+phone call yielded no help.

ravara28 · Apr 21, 2021

sar104 said:
Had you charged the battery recently, or had it been sitting for some time after charging? The cell voltages, and cell 3 especially, collapsed after you switched to sport mode:

View attachment 85788

View attachment 85789

Hi sar can you check my flight log DAT FILE
Because my mavic air 2 dropped while in mid air before it happened there was an error “lost GPS signal and then it crashed” here’s my dat file if you have spare time please check, thank you in advance

Copy of EXPORT_FILE_2021-04-19_20-21-30.DAT

drive.google.com

sar104 · Apr 21, 2021

ravara28 said:
Hi sar can you check my flight log DAT FILE
Because my mavic air 2 dropped while in mid air before it happened there was an error “lost GPS signal and then it crashed” here’s my dat file if you have spare time please check, thank you in advance

Copy of EXPORT_FILE_2021-04-19_20-21-30.DAT

drive.google.com

Unfortunately the Air 2 DAT files are encrypted and only readable by DJI.

Flight log doesn't show last couple of flights+the crash

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