What is the minimum airspeed required for proper operation of the ADG generator?

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Multiple Choice

What is the minimum airspeed required for proper operation of the ADG generator?

Explanation:
An ADG uses ram air to spin a small turbine inside the generator. To deliver usable electrical power, the turbine has to reach a minimum rotational speed, which corresponds to about 135 knots indicated airspeed. Below that speed, there isn’t enough airflow to spin the turbine up to the speed needed for reliable generation, so the emergency power won’t be available. At or above 135 KIAS, the turbine can spin fast enough to provide the required power to the essential systems. So, while speeds higher than 135 KIAS (like 150 KIAS) would also work, 135 KIAS is the threshold—the minimum speed needed for proper operation.

An ADG uses ram air to spin a small turbine inside the generator. To deliver usable electrical power, the turbine has to reach a minimum rotational speed, which corresponds to about 135 knots indicated airspeed. Below that speed, there isn’t enough airflow to spin the turbine up to the speed needed for reliable generation, so the emergency power won’t be available. At or above 135 KIAS, the turbine can spin fast enough to provide the required power to the essential systems. So, while speeds higher than 135 KIAS (like 150 KIAS) would also work, 135 KIAS is the threshold—the minimum speed needed for proper operation.

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