When must a pilot conduct a "Weight and Balance" assessment?

The requirement for a pilot to conduct a "Weight and Balance" assessment before every flight is rooted in ensuring the safety and performance of the aircraft. This assessment is crucial because it verifies that the total weight of the aircraft, along with its load distribution, stays within the manufacturer’s specified limits. Proper weight and balance significantly affect the aircraft's performance characteristics, including takeoff distance, climb rate, and fuel efficiency.

Having accurate weight and balance is essential to prevent situations that could lead to control difficulties or diminished performance during flight. It's a fundamental aspect of pre-flight checks, ensuring that operational limits are adhered to and enhancing the safety of the flight. This practice is a core part of a pilot's responsibility before each flight, reflecting the importance of meticulous preparation in aviation safety protocols.

Other responses do not encapsulate the critical nature of routine assessments necessary for each flight, as they suggest either infrequency or situational necessity, which would compromise safety protocols. Regularly assessing weight and balance before flights helps pilots make informed decisions, enhancing overall operational safety.