Never happened before

[sar104]

I'm out of my league. I don't know anything about getting files off the aircraft. I looked at the guide in your signature but it says that i need DJI assistant 2. I can't even find that.

Okay - well I think by inference at least the event is explainable - it was likely attempting to RTH as @eEridani suggested, but it was prevented from completing the maneuver by the rock obstacle. By the time you had re-acquired connection the battery was down to just a couple of percent, and so forced landing could not be canceled.

 

[sar104]

Your first TXT log ended at around 343sec with 64% battery ... your craft was then up on the max set height (200m) & the connection started to be sketchy (white vertical stripes in the chart=disconnected). All RC commands was nicely obeyed by the craft as shown in the data compiled in the chart.

Dotted graphs is the stick inputs ... Rudder (red) correlates to a yaw movement (blue), Elevator input (purple) correlates nicely to heading speed changes (black) ... and throttle commands (yellow) fits nicely to changes in the vertical Z-speed (light blue).

All was normal ...

View attachment 136291

... and your craft was here when the first log ended ... note at the big red arrow that the mobile device location is included in the data (explain further below...)

View attachment 136294

When the log recording continues (the second .TXT log) the timing is 1188sec & the battery is down at 1% & the craft is lowbattery auto landing. No stick inputs is made what so ever. & the connection is still sketchy (white vertical stripes in the chart=disconnected).

View attachment 136295

... and the craft is now here & are descending, the second log ends at 181,9m height relative the HP. Also note that during this short second log no mobile device position data is included anymore.

View attachment 136296

So what happened in between those 2 logs separated with 845sec & 63% battery ..?

My firm belief is that this was due to a disconnect between your RC & mobile device ... the craft obeyed all inputs it got according to the logs ... it had moved horizontally in between the 2 logs ... & in the first log the mobile device position was included in the data but not in the second.

So why didn't it make a low battery RTH ? I believe it actually did ... but either you canceled it unintentionally by pushing the RTH button on the RC, below from the manual... or it encountered an obstacle blocking it's way & the OD sensors stopped it.

View attachment 136298

The mobile device DAT log you included pretty much confirms my idea about the RC/mobile device disconnect ...

View attachment 136299

In order to know more about what happened in between those 2 log recording occasions the craft DAT log is needed.

It was an aircraft - RC disconnect, not an RC - device disconnect. The horizontal motion between the two logs was the RTH attempt as far as the obstacle.

 

[sawyerbrownlive]

I will keep working on the aircraft DAT files for you. Can you simplify that for me? BTW....i do recall getting a RTH notification before it landed. However i had already driven 1.5 miles away from the launch point AND my wife was standing under the aircraft. I cancelled RTH as i just wanted it to land where i knew i could retrieve it.

 

[eEridani]

I think you need this one (for a Mavic Pro):
DJI Assistant 2 - Download Center - DJI

Install the software on your desktop, connect to your drone via USB, find and copy the appropriate files.



And they have a later release NOT compatible with the Mavic Pro - but for newer drones:

DJI Assistant 2 For Mavic - Download Center - DJI

At the DJI Download Center, learn and downloadDJI Assistant 2 For Mavic

www.dji.com

 

[slup]

It was an aircraft - RC disconnect, not an RC - device disconnect. The horizontal motion between the two logs was the RTH attempt as far as the obstacle.

Could have been ... eventually at least, when the battery got low. But if it was a disconnect between AC/RC or mobile device/RC to begin with is without the craft DAT unknown at this stage. I'm puzzled by the heights there read out from GE ... if the craft was on 200m relative HP it should have been approx 50m above that rocky peak.

Well the craft DAT will reveal what happened

 

[sar104]

I will keep working on the aircraft DAT files for you. Can you simplify that for me? BTW....i do recall getting a RTH notification before it landed. However i had already driven 1.5 miles away from the launch point AND my wife was standing under the aircraft. I cancelled RTH as i just wanted it to land where i knew i could retrieve it.

It was already in forced landing mode when you recovered the connection. It will have dropped out of failsafe RTH when the battery level fell below the smartBattery.landBattery value, which was 16% at that time.

 

[sar104]

Could have been ... eventually at least, when the battery got low. But if it was a disconnect between AC/RC or mobile device/RC to begin with is without the craft DAT unknown at this stage. I'm puzzled by the heights there read out from GE ... if the craft was on 200m relative HP it should have been approx 50m above that rocky peak.

Well the craft DAT will reveal what happened

If you are working from the Google Earth DEM - it's not accurate for those rocks:

 

[sawyerbrownlive]

The aircraft files are downloaded to my laptop....now uploading to Dropbox. Will post once i can. I appreciate everyone's feedback. Thank you!

 

[sawyerbrownlive]

Dropbox - File Deleted - Simplify your life

www.dropbox.com

 

[sar104]

Dropbox - File Deleted - Simplify your life

www.dropbox.com

That was the wrong DAT file - it contains FLY113 and FLY114. We need a previous one that has FLY111.

 

[sawyerbrownlive]

I downloaded the only file with yesterday's date, i thought. I'm looking at "data upload" on the DJI assistant 2. I'm looking now and i don't see any flights from yesterday. I only see today's dates listed

 

[sawyerbrownlive]

How do i retrieve dates from yesterday? I've been looking

 

[sar104]

I downloaded the only file with yesterday's date, i thought. I'm looking at "data upload" on the DJI assistant 2. I'm looking now and i don't see any flights from yesterday. I only see today's dates listed

113 and 114 were not flights - just power up events at your house starting at 11:24.

View attachment 136313
How do i retrieve dates from yesterday? I've been looking

Is there nothing past index 6?

 

[sawyerbrownlive]

Nope

 

[eEridani]

Nothing in the Flight Data folder?

 

[sawyerbrownlive]

Nothing in the Flight Data folder?

 

[eEridani]

I do not use DJI Assistant 2 Mavic. I go direct, and while I can't make any sense of the DJI file structures, in Windows - I just connect my drone as a USB device, the I'll use file manager to search for .DAT files on the drone, which usually shows up as internal memory and the drone SD card (Mavic Pro only has the SD card?). Then I copy what it finds that looks promising: usually somewhere in the DJI and flight app sub directories, DJI Fly for me, probably DJI Go or similar for you.

If you removed the SD card, taken off the videos and formatted it, I think the log files are lost.

 

[slup]

Nope

Could it be that the older logs already have been overwritten ... don't know how large the memory for the craft DAT is really ... I mean considering that only 2 power up's (whats attached earlier) weigh over 400 meg. @sar104

 

[sar104]

Could it be that the older logs already have been overwritten ... don't know how large the memory for the craft DAT is really ... I mean considering that only 2 power up's (whats attached earlier) weigh over 400 meg. @sar104

My Mavic Pro is out on loan so I can't check the internal memory. I do remember that there was an issue with some aircraft where some of the DAT files were stored in a different location, for no apparent reason. @BudWalker discovered that quirk, and I think it applied to the Pro.

 

[sar104]

Could it be that the older logs already have been overwritten ... don't know how large the memory for the craft DAT is really ... I mean considering that only 2 power up's (whats attached earlier) weigh over 400 meg. @sar104

This thread discusses the issue, although my recollection is that it turned out to be a bit more random as to which files showed up in the accessible SD card location:

Keeping .DATs on the Mavic Pro accessible

Many pilots running FW 01.03.0900 thru FW 01.04.0300 have the problem that .DATs aren't accessible. The first flights on a new Mavic Pro are accessible via DJI Assistant 2. But, then after 10 to 20 flights any new flights stop appearing. I've discovered a way around this problem that some pilots...

mavicpilots.com