The AMS42U provides independent radio control for pilot and co-pilot with transmit capability for 5 COMx (with auto-receive function) and a PA.  There is intercom capability for Pilot, Co-Pilot, and up to 5 passengers with an ICS tie line for connection to multiple controllers.  2 direct inputs accommodate funcitons such as rad alt, GPS alerts, low rotor, telephone ringer, etc.   Front panel emergency mode switches the pilot's and co-pilot's headphones directly to the selected radios.