# Unknown RC Command

**URL:** <https://discuss.px4.io/t/unknown-rc-command/17335>\
**Category:** Flight Testing & Log Analysis\
**Created:** [June 25, 2020, 1:42pm UTC](https://discuss.px4.io/t/unknown-rc-command/17335 "2020-06-25T13:42:32Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![HVK](https://discuss.px4.io/user_avatar/discuss.px4.io/hvk/32/11738_2.png) [@HVK](https://discuss.px4.io/u/HVK)\
**Post date:** [June 25, 2020, 1:42pm UTC](https://discuss.px4.io/t/unknown-rc-command/17335/1 "2020-06-25T13:42:32Z")

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Hi there,  
Could someone please answer me from where the stabilized mode command came and the kill switch. I did not switch it to that mode with my RC.

[https://logs.px4.io/plot\_app?log=1cba99d5-0ef8-49db-8d90-52ac9c774273](https://logs.px4.io/plot_app?log=1cba99d5-0ef8-49db-8d90-52ac9c774273)

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**Author:** ![JulianOes](https://discuss.px4.io/user_avatar/discuss.px4.io/julianoes/32/30_2.png) [@JulianOes](https://discuss.px4.io/u/JulianOes)\
**Post date:** [June 26, 2020, 7:46am UTC](https://discuss.px4.io/t/unknown-rc-command/17335/2 "2020-06-26T07:46:02Z")

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It looks like you lost RC and the RC values went to a weird value before they were lost completely. What RC are you using? And have you checked RC failsafe before flying?

See: [https://docs.px4.io/master/en/config/radio.html#rc\_loss\_detection](https://docs.px4.io/master/en/config/radio.html#rc_loss_detection)

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**Author:** ![HVK](https://discuss.px4.io/user_avatar/discuss.px4.io/hvk/32/11738_2.png) [@HVK](https://discuss.px4.io/u/HVK)\
**Post date:** [June 26, 2020, 8:11am UTC](https://discuss.px4.io/t/unknown-rc-command/17335/3 "2020-06-26T08:11:07Z")

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Radiolink T8FB and R8EF. RC loss failsafe is Return so it explains the RTL. I forgot the disable it before Mission but still I did not get the weird RC value.

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**Author:** ![JulianOes](https://discuss.px4.io/user_avatar/discuss.px4.io/julianoes/32/30_2.png) [@JulianOes](https://discuss.px4.io/u/JulianOes)\
**Post date:** [June 26, 2020, 8:13am UTC](https://discuss.px4.io/t/unknown-rc-command/17335/4 "2020-06-26T08:13:45Z")

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Have you tried switching your RC off to check what happens (without actually flying)?

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**Author:** ![HVK](https://discuss.px4.io/user_avatar/discuss.px4.io/hvk/32/11738_2.png) [@HVK](https://discuss.px4.io/u/HVK)\
**Post date:** [June 27, 2020, 6:34am UTC](https://discuss.px4.io/t/unknown-rc-command/17335/5 "2020-06-27T06:34:22Z")

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Yes it directly enters Return.

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**Author:** ![mehmetydz87](https://discuss.px4.io/user_avatar/discuss.px4.io/mehmetydz87/32/2017_2.png) [@mehmetydz87](https://discuss.px4.io/u/mehmetydz87)\
**Post date:** [June 29, 2020, 7:08am UTC](https://discuss.px4.io/t/unknown-rc-command/17335/6 "2020-06-29T07:08:15Z")

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Dear @JulianOes and @HVK

I think, I and a few more people have experienced this situation and I think it is necessary to check.Thanks

Discuss Topic Here →

> [@Firmware 1.10.1 Stable Release Motor Disarm Issue in Flight](https://discuss.px4.io/t/firmware-1-10-1-stable-release-motor-disarm-issue-in-flight/14858/9):
>
> [Here is your ulog uploaded to the PX4 Flight Review.](https://review.px4.io/plot_app?log=6e0db59a-230f-4721-9c50-641b89dae9cd) Looking at the [full parameters](https://review.px4.io/download?log=6e0db59a-230f-4721-9c50-641b89dae9cd&type=1) you have no kill switch but you do have an arming switch configured. RC\_MAP\_KILL\_SW, 0 RC\_MAP\_ARM\_SW, 5 RC\_MAP\_FLTMODE, 7 RC\_MAP\_RETURN\_SW, 8 RC\_MAP\_OFFB\_SW, 9 Watching that channel in QGroundControl with the tlog I see it used between flights but not activated near the end. The throttle increases while the servo outputs are falling so it doesn’t seem to be an RC glitch, though the reported RSSI did look a bit…