What is the purpose of the % MAC figure after weight and balance is completed?

The % MAC (Mean Aerodynamic Chord) figure after weight and balance calculations plays a critical role in setting the appropriate pitch trim for an aircraft. This measurement helps pilots and engineers understand where the center of gravity (CG) is located in relation to the aircraft's aerodynamic center. Knowing the CG position relative to the MAC enables the adjustment of pitch trim to ensure stable flight characteristics. Properly setting the pitch trim contributes to the aircraft’s overall handling and efficiency, particularly during different phases of flight like takeoff and landing.

In the context of weight and balance, accurately determining the CG is essential for safe flying; it affects the aircraft's performance and maneuverability. This is why the % MAC is specifically used to inform pitch trim adjustments, ensuring the aircraft remains controllable and stable throughout its operation.