There are two knobs you need to change. Set the mode to TA/RA in the lower right of the TCAS panel, and set the knob in the upper left of the panel from OFF to either ON or AUTO.
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There are two knobs you need to change. Set the mode to TA/RA in the lower right of the TCAS panel, and set the knob in the upper left of the panel from OFF to either ON or AUTO.