When is it important to check the weight and balance of an aircraft?

Checking the weight and balance of an aircraft before every flight is crucial for ensuring safety and optimal performance. This process helps pilots determine if the aircraft is within its maximum weight limits and that the center of gravity is within acceptable ranges. Proper weight and balance calculations can prevent issues such as stalling or controlling the aircraft improperly, which can lead to dangerous situations during takeoff, flight, and landing.

By conducting these checks before each flight, pilots can account for variables such as fuel load, passengers, cargo, and any changes in equipment that might affect the aircraft's weight and configuration. This proactive measure is essential to maintaining operational safety and adhering to regulatory standards.

Other options imply that there are circumstances under which weight and balance checks could be skipped, but this practice is integral to flight safety and should be treated as a consistent requirement for every flight operation.