Alpha Mode of Operation is typically between what percent of engine operating speed?

• A. 90-95 percent
• B. 95-100 percent
• C. 100-105 percent
• D. 85-90 percent

Answer: (B)

Alpha mode is the high-thrust region of engine operation, where the engine runs at near full speed to provide maximum power when you need it most. This typically sits in the 95 to 100 percent range of the engine’s operating speed. Staying in this zone ensures rapid responsiveness and full power for takeoff and go-arounds, while staying within the engine’s design limits. Pushing beyond 100 percent would exceed the allowable speed and risk overspeed damage, and operating noticeably below 95 percent would not give you the full thrust you need in high-demand maneuvers. In practice, you’ll see the engine spool up into this near-maximum range when you advance the throttle for takeoff or a go-around and hold there while you require full thrust.