What condition leads to the highest value of V(MC)?

• A. CG is at the most forward allowable position
• B. CG is at the most rearward allowable position
• C. Weight is maximized
• D. The aircraft is lightly loaded

Answer: (B)

The highest value of V(MC), or the minimum control speed in the air, is achieved when the center of gravity (CG) is at the most rearward allowable position. This is because the CG location directly influences the aircraft's longitudinal stability and control characteristics.

When the CG is positioned towards the rear, the aircraft requires a lower angle of attack to maintain level flight, thereby increasing the effective lift generated. This can lead to reduced control inputs being needed at lower speeds. Consequently, the minimum control speed where the pilot can maintain safe control of the aircraft while losing an engine is lower in this condition. Essentially, this rearward CG position enhances the aircraft's performance in terms of maintaining controlled flight at reduced speeds.

In contrast, having the CG at the most forward position increases the required control forces and can lead to a higher V(MC) because the aircraft becomes less responsive to control inputs. Maximizing weight and lightly loading the aircraft also do not create optimal conditions for minimizing V(MC) since they influence the aircraft's overall performance and stability differently.