What gesture does a pilot use to signal for crewmember attention?

The correct gesture a pilot uses to signal for crewmember attention is to tap the canopy for visual confirmation. This action is effective because it provides a clear, physical signal that can be easily recognized by crewmembers. Tapping the canopy often garners immediate attention and can be perceived even in noisy environments, making it a practical choice for communication in the cockpit.

Using hand signals directed towards the control stick might not effectively convey the need for attention, as the control stick is primarily a control interface rather than a signaling tool. Shaking the control stick would not be a recognized gesture for signaling crewmembers and could be perceived as an erratic motion, rather than a clear call for attention. Shouting through the intercom system, while it may seem like an option, can be impractical in situations where voice communication may not reach effectively or could add needless noise in a busy cockpit environment.

Thus, tapping the canopy serves as a straightforward and effective method for gaining the attention of crewmembers, ensuring clear communication without causing confusion.