My rig is the following:

DJI F450 frame

DJI E310 propulsion system

4S 5000 mah battery

AUW ~1600g

My quad suddenly jerked when I was about to start my final descent and fell off the sky from a moderate height.

I am attaching a copy of my .bin log. Thanks in advance

Alvaro

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Sorry, Alvaro, but you haven't given nearly enough information about your machine to make an intelligent guess as to what went wrong however, a quick auto-analysis of your log file in Mission Planner indicated the following:

Log File Z:\tmp\tmpCBA.tmp.log

Size (kb) 1172.853515625
No of lines 15020
Duration 0:00:46
Vehicletype ArduCopter
Firmware Version V3.3.3
Firmware Hash acf2e10c
Hardware Type
Free Mem 0
Skipped Lines 0

Test: Autotune = NA -
Test: Brownout = GOOD -
Test: Compass = FAIL - Large change in mag_field (94.85%)

Test: Dupe Log Data = GOOD -
Test: Empty = GOOD -
Test: Event/Failsafe = FAIL - ERR found: CRASH
Test: GPS = GOOD -
Test: IMU Mismatch = GOOD - (Mismatch: 0.40, WARN: 0.75, FAIL: 1.50)
Test: Motor Balance = WARN - Motor channel averages = [1500, 1461, 1595, 1496]
Average motor output = 1512
Difference between min and max motor averages = 134
Test: Parameters = GOOD -
Test: PM = NA -
Test: Pitch/Roll = NA -
Test: Thrust = NA -
Test: VCC = GOOD -

A graph of your log revealed huge spikes in your compass mag X, Y and Z values immediately before your crash so I would say your compass (and electrical interference) would be a good place to start.  See 'Compass Interference' in the below:  http://ardupilot.org/copter/docs/common-diagnosing-problems-using-l...

Good luck

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