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Message & Error Explainer

What an ArduPilot message means and what to do about it

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The radio link is back, but the copter keeps the failsafe mode

InformationFailsafes and emergencies in flightCopter only

What ArduPilot says:

The receiver is heard again: frames are arriving and the throttle reads above FS_THR_VALUE. ArduPilot does nothing more: the copter stays in the mode the failsafe chose (RTL, Land, SmartRTL) and goes on flying it. To take control back, move the flight mode switch to another position. The switch is acted on only when its position changes, so to get the mode you had, flick it away and back.

Parameters to look at

ParameterWhat it is
FS_THR_ENABLEThrottle Failsafe Enable
FS_THR_VALUEThrottle Failsafe Value
The code that sends it

Radio Failsafe Cleared

ArduCopter/events.cpp Copter::failsafe_radio_off_event() · Open in ArduPilot Copter-4.7.1

Written here for Copter 4.6. In the tool you choose your vehicle and version, see your own parameter values beside the ones named here, and drop a flight log to have every message in it explained.

Open it in the Message & Error Explainer