Which pair correctly identifies the AOA-related components and their activation/engagement points?

Which pair correctly identifies the AOA-related components and their activation/engagement points?

• A. Shaker activates at 0.8 AOA; Pusher engages at 1.0 AOA
• B. Shaker activates at 1.0 AOA; Pusher engages at 0.8 AOA
• C. Shaker at 0.7 AOA; Pusher at 1.2 AOA
• D. Shaker at 0.9 AOA; Pusher at 1.1 AOA

Answer: (A)

Stall protection uses two AoA-based devices: a stick shaker for warning and a stick pusher for automatic protection. The shaker sounds or vibrates when AoA reaches a lower threshold, giving the pilot an early alert, while the pusher engages at a higher AoA to push the nose down if the pilot doesn’t respond in time. This order—warning first, then intervention—lets the pilot attempt recovery before automatic action. In this case, the shaker activates at 0.8 AOA, providing that early tactile cue, and the pusher engages at 1.0 AOA, delivering automatic protection if needed. That sequencing aligns with how stall protection is designed to function: warn, then intervene. Other thresholds would place the intervention before the warning or misalign the timing, which would reduce the effectiveness of the staged protection.

Stall protection uses two AoA-based devices: a stick shaker for warning and a stick pusher for automatic protection. The shaker sounds or vibrates when AoA reaches a lower threshold, giving the pilot an early alert, while the pusher engages at a higher AoA to push the nose down if the pilot doesn’t respond in time. This order—warning first, then intervention—lets the pilot attempt recovery before automatic action.

In this case, the shaker activates at 0.8 AOA, providing that early tactile cue, and the pusher engages at 1.0 AOA, delivering automatic protection if needed. That sequencing aligns with how stall protection is designed to function: warn, then intervene.

Other thresholds would place the intervention before the warning or misalign the timing, which would reduce the effectiveness of the staged protection.