When should an acceleration check be accomplished during takeoff?

An acceleration check is an important aspect of the takeoff procedure that helps ensure the aircraft's performance is within acceptable limits. The correct answer indicates that an acceleration check should be performed when split markers are present. Split markers are visual indicators on the runway that denote expected acceleration distances and are often used for performance validation.

When these markers are used, they provide a reference that allows pilots to determine if the aircraft is achieving the necessary speed and acceleration for safe takeoff within the limits of the runway. This check helps in assessing the aircraft's thrust-to-weight ratio and the conditions affecting acceleration, such as runway surface and environmental factors.

Conducting the acceleration check at this point ensures that the aircraft can reach takeoff speed safely before encountering the end of the runway, thereby enhancing safety during critical phases of flight. It is a proactive measure that aids pilots in making informed decisions during takeoff.