What is the primary method for calculating weight and balance information?

• A. Manual charts from the flight crew
• B. GPS-based weight estimates
• C. Aerodata interfaced through ACARS
• D. Aircraft maintenance computer

Answer: (C)

Weight and balance calculations rely on standardized data that describe how the aircraft’s weight and moment change with different configurations. The primary method uses aerodata—the published weight, arm, and moment data for the specific aircraft—and makes it available onboard through an interface with ACARS. This setup lets the flight crew input current loads (passengers, baggage, cargo) and fuel, and then the system automatically computes takeoff weight, center of gravity, and whether everything stays within permitted limits. Using aerodata via ACARS keeps the calculations accurate, up-to-date, and consistent with the aircraft’s configuration, reducing manual errors. Manual charts can be used if the automated system isn’t available, but they’re not the standard method; GPS estimates aren’t used for weight and balance calculations, and a maintenance computer isn’t the primary flight-deck tool for this purpose.