When the engine and wing anti-ice is on, the ______ limit is automatically reduced.

When the engine and wing anti-ice is on, the ______ limit is automatically reduced.

• A. N2
• B. N1
• C. EPR
• D. Thrust

Answer: (B)

When the engine and wing anti-ice are both on, the maximum allowable engine speed (N1) is automatically reduced. This happens because anti-ice uses bleed air and adds thermal and mechanical load to the engine system. The FADEC lowers the N1 limit to keep operation within safe margins, protecting the engine and anti-ice components from overheating or overload while still providing the required thrust. N2, EPR, and overall thrust aren’t the limits that get automatically tightened in this situation, so the direct effect you’ll notice is a lower N1 ceiling, which in turn can reduce the available thrust even if commanded.

When the engine and wing anti-ice are both on, the maximum allowable engine speed (N1) is automatically reduced. This happens because anti-ice uses bleed air and adds thermal and mechanical load to the engine system. The FADEC lowers the N1 limit to keep operation within safe margins, protecting the engine and anti-ice components from overheating or overload while still providing the required thrust. N2, EPR, and overall thrust aren’t the limits that get automatically tightened in this situation, so the direct effect you’ll notice is a lower N1 ceiling, which in turn can reduce the available thrust even if commanded.