DJI Mavic Mini Erratic Aircraft Behavior and Crash

[new2mavic]

I mean absolutely NO disrespect. However who would have been knowledgeable enough to know, without having previously seen the flight logs, to rotate the aircraft 180 degrees and fly the craft “backwards” to land safely? I don’t think even the techs from DJI would have that kind of skill set. Again, no disrespect to the poster, but I found that quite a puzzling response. Perhaps I simply misread the intent of the comment.

In fact this has been reported by a member in another thread before. He couldn't make the craft to fly forward so he tried flying it backward and successfully brought the craft home.

 

[MaxE1955!]

In fact this has been reported by a member in another thread before. He couldn't make the craft to fly forward so he tried flying it backward and successfully brought the craft home.

Wow, I would have never thought in a million years someone would be aware enough to try that. My apologies.

 

[BudWalker]

@Diegus011 Ok, initial look, the uncommanded descents are obvious. This has been seen with the mini's a few times. If I recall correctly the only thing we could determine from the past data was a possible firmware bug. Nothing else in the data shows a real reason for the descents. I will comment on one thing. The VPS looks a bit odd, but I don't think that was the primary cause.

View attachment 91125

There are some additional messages that can be obtained from the .txt. The available .txt to converters don't (yet) seem to be able to extract these messages. For this particular .txt these messages look like this

:
620.3 AIRCRAFT MAX POWER LOAD REACHED. DECREASE ALTITUDE AND FLY WITH CAUTION. IF THIS ISSUE PERSISTS, LAND IMMEDIATELY (CODE: 30168)
620.3 (MAX POWER LOAD REACHED. FLY WITH CAUTION
622.4 622.4 IN FLIGHT0
644.0 IAIRCRAFT IN HIGH INTERFERENCE ENVIRONMENT. FLY WITH CAUTION (CODE: 80015)
644.0 AIRCRAFT SIGNAL INTERFERENCE
647.0 647.0 IN FLIGHT0
795.0 IAIRCRAFT IN HIGH INTERFERENCE ENVIRONMENT. FLY WITH CAUTION (CODE: 80015)
795.0 AIRCRAFT SIGNAL INTERFERENCE
798.0 798.0 IN FLIGHT0
800.0 )BATTERY CELLS UNDERVOLTAGE (CODE: 110011)
800.0 ,BATTERY CELLS UNDER VOLTAGE. REPLACE BATTERY!
803.4 803.4 812.2 2LOW BATTERY. RETURN TO HOME PROMPTLY (CODE: 30183)
812.2 LOW BATTERY
812.2 $LOW BATTERY. RETURN TO HOME PROMPTLY!
866.4 )BATTERY CELLS UNDERVOLTAGE (CODE: 110011)2LOW BATTERY. RETURN TO HOME PROMPTLY (CODE: 30183)
866.4 866.4 ,BATTERY CELLS UNDER VOLTAGE. REPLACE BATTERY!

You can get these messages yourself. It's a bit tricky, no GUI, just the bare essentials...
Download
http://datfile.net/CsvView/TxtCon.1.0.0.jar

And then run it in a command line interpreter like so

java -jar TxtCon.1.0.0.jar <Full pathname of .txt>

in this case I did

java -jar TxtCon.1.0.0.jar /Users/rowland/MavicMini/FLYLOGS/diegus011/DJIFlightRecord_2020-01-12_[07-13-21].txt

@new2mavic , @slup, @Doppler , @sar104

 

[sar104]

There are some additional messages that can be obtained from the .txt. The available .txt to converters don't (yet) seem to be able to extract these messages. For this particular .txt these messages look like this

:
620.3 AIRCRAFT MAX POWER LOAD REACHED. DECREASE ALTITUDE AND FLY WITH CAUTION. IF THIS ISSUE PERSISTS, LAND IMMEDIATELY (CODE: 30168)
620.3 (MAX POWER LOAD REACHED. FLY WITH CAUTION
622.4 622.4 IN FLIGHT0
644.0 IAIRCRAFT IN HIGH INTERFERENCE ENVIRONMENT. FLY WITH CAUTION (CODE: 80015)
644.0 AIRCRAFT SIGNAL INTERFERENCE
647.0 647.0 IN FLIGHT0
795.0 IAIRCRAFT IN HIGH INTERFERENCE ENVIRONMENT. FLY WITH CAUTION (CODE: 80015)
795.0 AIRCRAFT SIGNAL INTERFERENCE
798.0 798.0 IN FLIGHT0
800.0 )BATTERY CELLS UNDERVOLTAGE (CODE: 110011)
800.0 ,BATTERY CELLS UNDER VOLTAGE. REPLACE BATTERY!
803.4 803.4 812.2 2LOW BATTERY. RETURN TO HOME PROMPTLY (CODE: 30183)
812.2 LOW BATTERY
812.2 $LOW BATTERY. RETURN TO HOME PROMPTLY!
866.4 )BATTERY CELLS UNDERVOLTAGE (CODE: 110011)2LOW BATTERY. RETURN TO HOME PROMPTLY (CODE: 30183)
866.4 866.4 ,BATTERY CELLS UNDER VOLTAGE. REPLACE BATTERY!

You can get these messages yourself. It's a bit tricky, no GUI, just the bare essentials...
Download
http://datfile.net/CsvView/TxtCon.1.0.0.jar

And then run it in a command line interpreter like so

java -jar TxtCon.1.0.0.jar <Full pathname of .txt>

in this case I did

java -jar TxtCon.1.0.0.jar /Users/rowland/MavicMini/FLYLOGS/diegus011/DJIFlightRecord_2020-01-12_[07-13-21].txt

@new2mavic , @slup, @Doppler , @sar104

Nice - works perfectly. That's a useful addition to the extraction tools.

 

[slup]

There are some additional messages that can be obtained from the .txt. The available .txt to converters don't (yet) seem to be able to extract these messages. For this particular .txt these messages look like this

:
620.3 AIRCRAFT MAX POWER LOAD REACHED. DECREASE ALTITUDE AND FLY WITH CAUTION. IF THIS ISSUE PERSISTS, LAND IMMEDIATELY (CODE: 30168)
620.3 (MAX POWER LOAD REACHED. FLY WITH CAUTION
622.4 622.4 IN FLIGHT0
644.0 IAIRCRAFT IN HIGH INTERFERENCE ENVIRONMENT. FLY WITH CAUTION (CODE: 80015)
644.0 AIRCRAFT SIGNAL INTERFERENCE
647.0 647.0 IN FLIGHT0
795.0 IAIRCRAFT IN HIGH INTERFERENCE ENVIRONMENT. FLY WITH CAUTION (CODE: 80015)
795.0 AIRCRAFT SIGNAL INTERFERENCE
798.0 798.0 IN FLIGHT0
800.0 )BATTERY CELLS UNDERVOLTAGE (CODE: 110011)
800.0 ,BATTERY CELLS UNDER VOLTAGE. REPLACE BATTERY!
803.4 803.4 812.2 2LOW BATTERY. RETURN TO HOME PROMPTLY (CODE: 30183)
812.2 LOW BATTERY
812.2 $LOW BATTERY. RETURN TO HOME PROMPTLY!
866.4 )BATTERY CELLS UNDERVOLTAGE (CODE: 110011)2LOW BATTERY. RETURN TO HOME PROMPTLY (CODE: 30183)
866.4 866.4 ,BATTERY CELLS UNDER VOLTAGE. REPLACE BATTERY!

You can get these messages yourself. It's a bit tricky, no GUI, just the bare essentials...
Download
http://datfile.net/CsvView/TxtCon.1.0.0.jar

And then run it in a command line interpreter like so

java -jar TxtCon.1.0.0.jar <Full pathname of .txt>

in this case I did

java -jar TxtCon.1.0.0.jar /Users/rowland/MavicMini/FLYLOGS/diegus011/DJIFlightRecord_2020-01-12_[07-13-21].txt

@new2mavic , @slup, @Doppler , @sar104

Amazing @BudWalker ... many thank's

Were out & hiking in the woods today ... first sunny day since beginning of December so had to get out for some sun, cold air & burn some food over open fire ... and flying

Tested this on one of my MA logs... did get some results but only 2 warnings regarding high wind velocity. Now ... I rarely have any strange thing's happening when out flying though (yet!), but got the same messages as you show in your post for the event log, is it meant to work with other AC then the Mini?

 

[BudWalker]

Amazing @BudWalker ... many thank's

Were out & hiking in the woods today ... first sunny day since beginning of December so had to get out for some sun, cold air & burn some food over open fire ... and flying

Tested this on one of my MA logs... did get some results but only 2 warnings regarding high wind velocity. Now ... I rarely have any strange thing's happening when out flying though (yet!), but got the same messages as you show in your post for the event log, is it meant to work with other AC then the Mini?

I haven't used it with other platforms so I can't say much about that. From your test it seems that it works with the Go App connected to the MA.

My app is actually pretty dumb. All it does is look for a particular record type (recId == 54) and extract any printable strings from those records. It doesn't know anything about the internal structure of those records - it's just knows how to extract the printable strings.

 

[Deleted member 94047]

@BudWalker, all I get when I run the command as specified in post #23 is an "OK" return. What am I doing wrong? Thanks!

 

[BudWalker]

@BudWalker, all I get when I run the command as specified in post #23 is an "OK" return. What am I doing wrong? Thanks!

Nothing, all that means is that there were no records of that type to extract.

 

[BudWalker]

The TxtCon hack that I provided has been made obsolete by the new version of TXTlogToCSVtoolMM

Go to
[TOOL][WIN] Offline TXT FlightRecord to CSV Converter
and get the TXTlogToCSVtoolMM.zip version

@new2mavic , @slup, @Doppler , @sar104

 

[Deleted member 94047]

Awesome! Thanks Bud!

 

[sar104]

The TxtCon hack that I provided has been made obsolete by the new version of TXTlogToCSVtoolMM

Go to
[TOOL][WIN] Offline TXT FlightRecord to CSV Converter
and get the TXTlogToCSVtoolMM.zip version

@new2mavic , @slup, @Doppler , @sar104

But that's not nearly as much fun as running java code from the command line.

 

[BudWalker]

Awesome! Thanks Bud!

You should thank @ferraript over on phantompilots

 

[BudWalker]

But that's not nearly as much fun as running java code from the command line.

Yes, that's true. I discovered another benefit of using the hack. It's dreadfully slow. About 200 times slower than it could be.

 

[Deleted member 94047]

You should thank @ferraript over on phantompilots

Went there to do just that, and discovered I need a separate account there to comment

 

[BudWalker]

The TxtCon hack is now part of CsvView 3.7.3. It's a new feature called eventLog Player which displays the messages in the .txt log file AND will display the contents of the eventLog stream for a .DAT. The eventLog Player can be synchronized with the GeoPlayer and SigPlayers. Check it out.

@slup, @new2mavic , @Doppler , @Fly Dawg , @sar104 , @msinger

 

[slup]

The TxtCon hack is now part of CsvView 3.7.3. It's a new feature called eventLog Player which displays the messages in the .txt log file AND will display the contents of the eventLog stream for a .DAT. The eventLog Player can be synchronized with the GeoPlayer and SigPlayers. Check it out.
View attachment 93973
@slup, @new2mavic , @Doppler , @Fly Dawg , @sar104 , @msinger

Super @BudWalker many thank's