Domanda 301, Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Only The Position Of The Selector Switch.
A green system "ON" information light and an amber system failure light.
Amber lights when the system is functioning with a red warning should the windscreen enter an overheat condition.
Green Or Blue Lights Which Cycle On/off With The Function Of The Heating Elements.