What is the standby temperature for the propeller heat?

The standby temperature for propeller heat is set to activate when the outside air temperature drops to more than 0 degrees Celsius. This setting acts as a safety measure, ensuring that the propeller heating system activates when temperatures could potentially lead to ice formation. This is particularly important for maintaining optimal performance and safety during operations.

Understanding the specific temperature ranges is critical for effective flight operations, especially in colder climates where icing can become a hazard. The given options represent various ranges of temperature, but the correct choice aligns with the operational guidelines that specify the propeller heat must be activated when conditions are warm enough to mitigate risks without unnecessary energy expenditure.