What is a "weight must"?

A "weight must" refers to a requirement for maintaining safety margins during flight. This concept emphasizes that the aircraft must stay within specific weight limits to ensure optimal performance, stability, and control. Maintaining these safety margins is crucial for preventing issues such as stalls, inadequate climb performance, and adverse handling characteristics, all of which can jeopardize flight safety.

In aviation, understanding weight and balance is essential. Pilots must not only be aware of the maximum weight limits for the aircraft but also ensure that the distribution of weight does not adversely affect the center of gravity. Hence, a "weight must" underscores the importance of adhering to weight constraints to guarantee that the aircraft operates safely within its designed parameters. Each of the other options relates to weight considerations in aviation, but only the requirement for safety margins encapsulates the critical nature of maintaining safe operational limits throughout the flight.