Regarding the statements about private aircraft weighing, which is/are true? (1) Private aircraft are weighed periodically. (2) Private aircraft are weighed after alterations.

• A. Neither No. 1 nor No. 2 is true
• B. Both No. 1 and No. 2 are true
• C. Only No. 1 is true
• D. Only No. 2 is true

Answer: (C)

The key idea is that weight and balance data must reflect the actual airplane configuration. You keep current BEW (basic empty weight) and CG by verifying the data periodically, because over time changes—wear, maintenance, equipment swaps, or ballast—can shift the weight and its moment. A periodic weigh-in provides a fresh, accurate starting point for calculating loads and CG for flight operations.

Weighing after alterations is not automatically required if you can determine the alteration’s effect on weight and moment from known data (for example, if you install a component with a documented weight and arm and you can update the BEW and CG accordingly). In that case, you update the records without reweighing. A reweigh is needed only when the change cannot be quantified precisely from reliable data.

So, periodic weighing is the reliable practice to keep W&B data current, while weighing after alterations depends on whether you can accurately account for the change without a new measurement. This aligns with selecting the statement that periodic weighing is true while the blanket requirement to weigh after alterations is not universally true.