What should a pilot ensure before performing weight and balance calculations?

Before performing weight and balance calculations, it is crucial for a pilot to ensure that all weights and measurements are taken accurately. Accurate data is essential because even minor discrepancies can lead to significant safety concerns during flight operations. This includes the weight of the aircraft itself, added cargo, passengers, and fuel.

Weight and balance calculations depend on precise numerical data to determine the aircraft's center of gravity and ensure it is within the acceptable limits. If there are errors in the weights of individual items or if measurements are inaccurate, the calculations can lead to an unsafe flying condition, compromising the aircraft's performance and handling characteristics.

While the other choices address aspects that could influence flight safety—such as ensuring the aircraft is in good condition or considering passenger preferences—they do not directly relate to the foundational requirement of obtaining accurate weights and measurements, which is critical for successful weight and balance assessment.