Firstly I have RTFM, but can someone tell me please if the TCAS system actually works. I have made repeated efforts to get it working without success. I actuate the system on the pedestal, and looking at the instructions it states switch the system on and off on the HSI, but I cant find a switch . Help please this driving me mad. John. Cypilot

first turn on the system on the pedestal, you say you've found that switch.Next press the switch on the main panel to turn on the display.This is the same switch you use to set the range on the ND, except instead of rotating it you press it.