Must the minimum N1 be monitored with nacelle heat ON?

Monitoring the minimum N1 with nacelle heat ON is not a requirement during normal operations. The nacelle heat system is typically activated in situations where there is a risk of ice accumulation on engine inlets, mainly in cold weather conditions. The engine's N1 parameter refers to the fan speed and is crucial for engine performance and efficiency. However, when nacelle heat is engaged, it does not necessitate continuous monitoring of minimum N1 because the heat is used primarily for ice prevention rather than for performance monitoring.

In normal circumstances, N1 values are monitored to ensure that the engines are functioning properly and providing the necessary thrust. Since nacelle heat has a more focused purpose related to icing conditions, its operation does not dictate the monitoring requirements for N1. Thus, it is acceptable to not monitor minimum N1 with nacelle heat ON, as the engine's performance parameters would still fall within acceptable ranges under normal circumstances.