Why is the shaker inhibited for five seconds after rotation during takeoff?

The shaker is inhibited for five seconds after rotation during takeoff primarily to prevent unnecessary alerts. This inhibition ensures that the pilots are not overwhelmed with warnings or alerts immediately after lifting off, allowing them to focus on the critical phase of the flight, which is to achieve a stable climb. During takeoff, the aircraft experiences various changes in dynamics and airspeed that could falsely trigger alerts, potentially leading to confusion or distraction. By delaying the shaker activation, pilots can concentrate on their flying tasks without being distracted by unnecessary alerts, thereby enhancing safety and situational awareness in the critical moments following takeoff.

While ensuring stability post-rotation is important, the primary intent behind this five-second inhibition is to enhance the overall safety and manageability for the flight crew during this crucial phase, rather than specifically targeting vibration management or regulatory compliance.