# VTOL crashed during PID tuning session - Help

**URL:** <https://discuss.px4.io/t/vtol-crashed-during-pid-tuning-session-help/18488>\
**Category:** Flight Testing & Log Analysis\
**Created:** [September 8, 2020, 8:35am UTC](https://discuss.px4.io/t/vtol-crashed-during-pid-tuning-session-help/18488 "2020-09-08T08:35:10Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![rotems](https://discuss.px4.io/letter_avatar_proxy/v4/letter/r/9d8465/32.png) [@rotems](https://discuss.px4.io/u/rotems)\
**Post date:** [September 8, 2020, 8:35am UTC](https://discuss.px4.io/t/vtol-crashed-during-pid-tuning-session-help/18488/1 "2020-09-08T08:35:10Z")

</div>

Hello,

I’m working on a VTOL model and was in a PID tuning session.  
the model flight good at Stabilized mode and at approach landing while turning left the model start to roll right, I’ve tried to switch to Manual but it was too late and the model crashed.

can someone help to understand the reason of this action.

I’ve checked all the servos, flight controller, electric connections and everything is functioning.  
I’m using Pixhawk 2.1 as a FC.

I must mention that it’s not the 1st flight and landing of this model in stabilized mode.

Iv’e attached a link to the flight log file.  
[https://drive.google.com/file/d/1e3pc80AEdwzBDMP51CoL3YCuZG1EydUY/view?usp=sharing](https://drive.google.com/file/d/1e3pc80AEdwzBDMP51CoL3YCuZG1EydUY/view?usp=sharing)

Thank you  
Rotem