What is the minimum N1 limit for the right engine when on the ground with air conditioning off and generator load less than 80%?

In the context of the T-54A systems, the minimum N1 limit for the right engine when on the ground, with the air conditioning off and the generator load being less than 80%, is set at 61%. This specification is crucial for ensuring that the engine operates within safe and efficient margins, particularly during ground operations where certain systems are not in demand, thus allowing for a lower N1 requirement compared to in-flight conditions or higher loads.

The rationale behind this limit is tied to the operational stability of the engine. At 61% N1, the engine can maintain adequate thrust and performance, while also ensuring that it does not operate too low, which might lead to instability or difficulty in engine response should it need to accelerate quickly for takeoff or other maneuvers. Thus, meeting and maintaining this minimum N1 limit ensures both safety and operational readiness while on the ground.