Setting up ArduPilot's failsafe to handle RC signal loss

You have two options to handle failsafe.

• Set your radio to change the control switch value (sometimes channel 5) and set one of your control switch modes to RTL which means "Return to Launch".
• (Off by default) Set your radio to communicate its failsafe condition via the throttle - The only working method on Futaba Fasst systems. The autopilot will detect that the throttle has dropped below its trim value and will automatically return to launch location regardless of the current mode. The nice thing about this option is that you can set up your control switch without using up a position for RTL.

For example a normal output for PWM is 1000 - 2000 µs pulses. Set your radio to go to 900µs during failsafe to trigger Ardupilot. You MUST connect your throttle input jumper to read the throttle.

Note: You must change "THROTTLE_FAILSAFE 0" (default) to "THROTTLE_FAILSAFE 1" in the config file to enable throttle based failsafe, as shown:

#define THROTTLE_FAILSAFE 1     // Do you want to react to a throttle failsafe condition? Default is no 0, Yes is 1

To setup a Futaba 7C 2.4 Ghz radio:

Setting up the three position control switch :

Go to the "End Position" Menu and set Ch5 to these values:

• > 140% > 63%

Setting up the Throttle Failsafe :

• Set End Point of Ch3 to 140%
• 1: End Position Menu:
• Set Ch3: to this:
• > 100% > 140%

2: Failsafe Menu

• Rotate the dial to F/S
• Press and hold the dial to set it

3: Return to End Position Menu:

• Set Ch3 back to this:
• > 100% > 100%