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The MultiWii FailSafe will try to save your copter and environment by slowly descending and (after a configured timespan) engine shutoff if the radio signal is lost.

This feature needs proper configuration in "config.h" depending to your transmitter/reciever and copter setup. It is disabled by default! Setup details here Extra_features#Failsafe

Failsafe with FrSky receivers

The documentation for the FrSky receivers tells us that rebinding the receiver will disable failsafe. The receiver will continue to transmit the last received value, however so the flight control can't detect it. If you have a FrSky receiver, in order to completely disable the failsafe built into the receiver, you need to push the button on the receiver while the transmitter is turned off.