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RC receiver question

Hey LMR!

I need your help on this one: Above is the RC setup I'm planning to use in my next project. I extracted it from a wrecked RC plane I got my hands on. As you can see it's quite basic: a 4-channel receiver, speed controller + motor and servos. I know that each controller function corresponds to one of the four designated outputs on my receiver. You'll notice there's also another output port, labelled 6/B: