[rmorris]

Have this AF-420A a/p unit in my plane, and previously only gave me heading bug track (hooked up to a NSD 360 HSI)...but after new avioincs install AND HSI overhaul, it now does not seem to work correctly. When tearing out interior for the annual I noticed a switch on the back of the unit that says serve and has in or out...I can't find a manual anywhere online to figure out the correct position of this switch. While I can try ti both ways, I was hoping someone might have a pdf they can share online for this a/p.