During a normal landing roll, which method should NOT be used to determine speed?

The triple board method is typically associated with estimating the speed of an aircraft during landing, and while this method can provide a rough idea, it is not the most reliable or precise way to determine actual airspeed during a landing roll. This method often relies on external visual cues and the perception of the pilot, which can be subjective and lead to inaccuracies under certain conditions.

In contrast, visual estimation can sometimes be effective but also lacks precision. Flight instrument readings provide the most accurate and reliable data regarding airspeed, as these instruments are calibrated for precise measurement, ensuring safety and adherence to proper landing techniques. Feedback from air traffic control is valuable for situational awareness and safety, but it is not directly a measurement of landing speed.

Therefore, the triple board method is the least suitable for accurately determining speed during a landing roll, emphasizing the importance of relying on precise instruments and data for safe flight operations.