In AUTO mode, the PROBE/WINDOW heat activates only under which condition?

In AUTO mode, the PROBE/WINDOW heat activates only under which condition?

• A. Whenever the pushbutton is AUTO regardless of engine status
• B. Only when at least one engine is running or the aircraft is in flight
• C. Only on the ground
• D. Only in flight

Answer: (B)

Auto mode for the PROBE/WINDOW heat is designed to run only when there is a real icing risk and when electrical power is available. In practice this means the system activates if at least one engine is producing power or the aircraft is in flight. On the ground with all engines off, Auto keeps the heat off to conserve power; if heat is needed on the ground, you’d switch to ON manually. So the condition that triggers activation in Auto is having an engine running or the aircraft being airborne.

Auto mode for the PROBE/WINDOW heat is designed to run only when there is a real icing risk and when electrical power is available. In practice this means the system activates if at least one engine is producing power or the aircraft is in flight. On the ground with all engines off, Auto keeps the heat off to conserve power; if heat is needed on the ground, you’d switch to ON manually. So the condition that triggers activation in Auto is having an engine running or the aircraft being airborne.