NG to idle speed is greater than what percentage?

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Multiple Choice

NG to idle speed is greater than what percentage?

Gas generator speed (NG) is the compressor turbine’s rotor speed expressed as a percent of its maximum. At idle, NG must stay above a minimum threshold to keep the engine stable, provide enough compressor airflow, and power the accessories and systems the helicopter relies on while the rotor is idle. For the UH-60S, the minimum NG for idle operation is greater than 63%. That’s why the best answer is the one stating “greater than 63%.” If NG were any lower, idle could become unstable or rough, and systems driven by the engine might not operate reliably. The other options aren’t the standard minimum: 50% or 60% would be too low to guarantee a stable idle, and 70% is higher than the usual idle target and isn’t the required minimum threshold.

Gas generator speed (NG) is the compressor turbine’s rotor speed expressed as a percent of its maximum. At idle, NG must stay above a minimum threshold to keep the engine stable, provide enough compressor airflow, and power the accessories and systems the helicopter relies on while the rotor is idle.

For the UH-60S, the minimum NG for idle operation is greater than 63%. That’s why the best answer is the one stating “greater than 63%.” If NG were any lower, idle could become unstable or rough, and systems driven by the engine might not operate reliably.

The other options aren’t the standard minimum: 50% or 60% would be too low to guarantee a stable idle, and 70% is higher than the usual idle target and isn’t the required minimum threshold.

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