How often must an aircraft be reweighed?

• A. Every 36 months
• B. Every 12 months
• C. Every 6 months
• D. Annually

Answer: (A)

Weight and balance data must reflect the actual airplane, so loading calculations stay accurate and the aircraft remains within its allowable center of gravity and weight limits. The data are updated by reweighing at intervals that do not exceed 36 months, ensuring any gradual changes to empty weight or moment from maintenance, repairs, or equipment additions are captured. If a modification or repair changes the weight or balance, or the manufacturer requires it, reweighing should be done sooner to keep the data current. The other options imply more frequent reweighing than is typically required for standard operations; the standard practice is a 36-month interval unless a specific airframe data sheet or manufacturer guidance says otherwise.