Final answer:
The wing anti-ice controller in NORM mode maintains wing temperature based on specific aircraft manufacturer specifications, which typically ensures wings remain ice-free during flight. The exact temperature is not stated but is crucial for safe flying conditions.
Step-by-step explanation:
The question pertains to the temperature at which the wing anti-ice controller maintains the wing in NORM mode. This appears to be a technical question related to aircraft systems, specifically the Thermawing technology. Thermawing is an anti-icing and deicing system that provides heated wing technology for single-engine aircraft, allowing them to safely fly through ice encounters. Though the exact temperature is not provided in the reference information, this system is vital for ensuring the wings remain ice-free during flight. For aircraft equipped with systems like Thermawing, the manufacturer's specifications would detail the operational temperatures for NORM mode. It is important for pilots and engineering professionals to understand these specifications for safe aircraft operation.