What is the minimum speed for ADG operation?

What is the minimum speed for ADG operation?

• A. 135 Knots (Min)
• B. 182 Knots Ground Speed
• C. Vmo/Mmo (Max)
• D. 280 Knots

Answer: (A)

When the airplane loses normal power sources, the air-driven generator (ADG) or ram air turbine must supply essential power. The turbine needs enough air, i.e., a certain indicated airspeed, to spin fast enough and develop the required electrical and hydraulic output. That minimum indicated airspeed is the speed at which ADG operation can be relied upon. Below this speed the ADG cannot produce sufficient power, so it cannot be counted on for essential systems. Therefore, the key point is the indicated airspeed threshold that guarantees adequate ADG output, not how fast the aircraft is moving over the ground or any maximum speed limits.

When the airplane loses normal power sources, the air-driven generator (ADG) or ram air turbine must supply essential power. The turbine needs enough air, i.e., a certain indicated airspeed, to spin fast enough and develop the required electrical and hydraulic output. That minimum indicated airspeed is the speed at which ADG operation can be relied upon. Below this speed the ADG cannot produce sufficient power, so it cannot be counted on for essential systems. Therefore, the key point is the indicated airspeed threshold that guarantees adequate ADG output, not how fast the aircraft is moving over the ground or any maximum speed limits.