In Pusher Ice Mode, which switches must the pilot set to indicate icing state?

• A. Inertial Separator OPEN and Prop De-Ice ON
• B. Inertial Separator CLOSED and Prop De-Ice OFF
• C. Pitot Heater ON and Engine Anti-Ice ON
• D. Wing Anti-Ice ON and Prop De-Ice OFF

Answer: (A)

In Pusher Ice Mode, icing state is signaled by two cockpit controls: the inertial separator and the prop de-ice switch. When icing is encountered, set the inertial separator to OPEN and switch Prop De-Ice ON. Opening the inertial separator allows ice-laden air to be managed at the intake and indicates to the system that icing conditions are active, while turning on prop de-ice provides heat to prevent ice on the prop blades. This combination is the proper way to indicate icing state in this mode. Other pairings either affect different systems (pitot heat or wing anti-ice) or leave de-ice off, which does not convey the icing condition for Pusher Ice Mode.