How often must an aircraft be weighed?

• A. Every 12 months
• B. Every 24 months
• C. Every 36 months
• D. Every 60 months

Answer: (C)

Weight and balance data must be kept current because the aircraft’s weight and moment change with maintenance, repairs, loading, and use. To ensure that the published weight and balance data reflect the actual airplane, the aircraft must be weighed at intervals not to exceed 36 months (3 years). If you perform major repairs or modifications that affect weight or the center of gravity, you must reweigh and update the data sooner. So, the standard requirement is weighing every 36 months; weighing more frequently (every 12 or 24 months) isn’t required by the rule, and waiting 60 months would let the data become outdated.