At what RPM does the engine running indicator come on?

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Multiple Choice

At what RPM does the engine running indicator come on?

Explanation:
The engine running indicator is tied to the rotor speed reaching a defined threshold that confirms the engine has moved from start up to a stable running condition. In this system, the indicator is set to come on at about 12,225 RPM, which is the point where airflow and compressor stability indicate the engine is actually running rather than just spinning up. Why this value works best: it avoids lighting too early during spool-up (which happens at lower speeds like 9,000 RPM) and it prevents false indication while the engine is still accelerating or during high-speed transient events. It’s also not placed at a much higher speed (like 14,500 RPM), which would delay indication after the engine is already running. The precise threshold of 12,225 RPM is chosen to reflect a reliable, steady-running condition. So the engine running indicator comes on at 12,225 RPM.

The engine running indicator is tied to the rotor speed reaching a defined threshold that confirms the engine has moved from start up to a stable running condition. In this system, the indicator is set to come on at about 12,225 RPM, which is the point where airflow and compressor stability indicate the engine is actually running rather than just spinning up.

Why this value works best: it avoids lighting too early during spool-up (which happens at lower speeds like 9,000 RPM) and it prevents false indication while the engine is still accelerating or during high-speed transient events. It’s also not placed at a much higher speed (like 14,500 RPM), which would delay indication after the engine is already running. The precise threshold of 12,225 RPM is chosen to reflect a reliable, steady-running condition.

So the engine running indicator comes on at 12,225 RPM.

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